38 results on '"Wolfe, Brett T."'
Search Results
2. Hydraulically‐vulnerable trees survive on deep‐water access during droughts in a tropical forest
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Chitra‐Tarak, Rutuja, Xu, Chonggang, Aguilar, Salomón, Anderson‐Teixeira, Kristina J, Chambers, Jeff, Detto, Matteo, Faybishenko, Boris, Fisher, Rosie A, Knox, Ryan G, Koven, Charles D, Kueppers, Lara M, Kunert, Nobert, Kupers, Stefan J, McDowell, Nate G, Newman, Brent D, Paton, Steven R, Pérez, Rolando, Ruiz, Laurent, Sack, Lawren, Warren, Jeffrey M, Wolfe, Brett T, Wright, Cynthia, Wright, S Joseph, Zailaa, Joseph, and McMahon, Sean M
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Plant Biology ,Biological Sciences ,Ecology ,Good Health and Well Being ,Droughts ,Forests ,Plant Leaves ,Trees ,Water ,Water Supply ,Xylem ,deep-water access ,drought tolerance ,drought-induced mortality ,hydraulic vulnerability and safety margins ,hydrological droughts ,rooting depths ,safety-efficiency trade-off ,tropical forest ,Agricultural and Veterinary Sciences ,Plant Biology & Botany ,Plant biology ,Climate change impacts and adaptation ,Ecological applications - Abstract
Deep-water access is arguably the most effective, but under-studied, mechanism that plants employ to survive during drought. Vulnerability to embolism and hydraulic safety margins can predict mortality risk at given levels of dehydration, but deep-water access may delay plant dehydration. Here, we tested the role of deep-water access in enabling survival within a diverse tropical forest community in Panama using a novel data-model approach. We inversely estimated the effective rooting depth (ERD, as the average depth of water extraction), for 29 canopy species by linking diameter growth dynamics (1990-2015) to vapor pressure deficit, water potentials in the whole-soil column, and leaf hydraulic vulnerability curves. We validated ERD estimates against existing isotopic data of potential water-access depths. Across species, deeper ERD was associated with higher maximum stem hydraulic conductivity, greater vulnerability to xylem embolism, narrower safety margins, and lower mortality rates during extreme droughts over 35 years (1981-2015) among evergreen species. Species exposure to water stress declined with deeper ERD indicating that trees compensate for water stress-related mortality risk through deep-water access. The role of deep-water access in mitigating mortality of hydraulically-vulnerable trees has important implications for our predictive understanding of forest dynamics under current and future climates.
- Published
- 2021
3. Disentangling the Effects of Vapor Pressure Deficit and Soil Water Availability on Canopy Conductance in a Seasonal Tropical Forest During the 2015 El Niño Drought
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Fang, Yilin, Leung, L Ruby, Wolfe, Brett T, Detto, Matteo, Knox, Ryan G, McDowell, Nate G, Grossiord, Charlotte, Xu, Chonggang, Christoffersen, Bradley O, Gentine, Pierre, Koven, Charles D, and Chambers, Jeffrey Q
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Earth Sciences ,Atmospheric Sciences ,Climate Change Science ,Clean Water and Sanitation ,canopy conductance limitation ,ELM ,plant hydrodynamic model HYDRO ,tropical forest ,vapor pressure deficit ,water stress ,Physical Geography and Environmental Geoscience ,Atmospheric sciences ,Climate change science - Abstract
Water deficit in the atmosphere and soil are two key interactive factors that constrain transpiration and vegetation productivity. It is not clear which of these two factors is more important for the water and carbon flux response to drought stress in ecosystems. In this study, field data and numerical modeling were used to isolate their impact on evapotranspiration (ET) and gross primary productivity (GPP) at a tropical forest site in Barro Colorado Island (BCI), Panama, focusing on their response to the drought induced by the El Niño event of 2015–2016. Numerical simulations were performed using a plant hydrodynamic scheme (HYDRO) and a heuristic approach that ignores stomatal sensitivity to leaf water potential in the Energy Exascale Earth System Model (E3SM) Land Model (ELM). The sensitivity of canopy conductance (Gs) to vapor pressure deficit (VPD) obtained from eddy-covariance fluxes and measured sap flux shows that, at both ecosystem and plant scale, soil water stress is more important in limiting Gs than VPD at BCI during the El Niño event. The model simulations confirmed the importance of water stress limitation on Gs, but overestimated the VPD impact on Gs compared to that estimated from the observations. We also found that the predicted soil moisture is less sensitive to the diversity of plant hydraulic traits than ET and GPP. During the dry season at BCI, seasonal ET, especially soil evaporation at VPD > 0.42 kPa, simulated using HYDRO and ELM, were too strong and will require alternative parameterizations.
- Published
- 2021
4. A reporting format for leaf-level gas exchange data and metadata
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Ely, Kim S, Rogers, Alistair, Agarwal, Deborah A, Ainsworth, Elizabeth A, Albert, Loren P, Ali, Ashehad, Anderson, Jeremiah, Aspinwall, Michael J, Bellasio, Chandra, Bernacchi, Carl, Bonnage, Steve, Buckley, Thomas N, Bunce, James, Burnett, Angela C, Busch, Florian A, Cavanagh, Amanda, Cernusak, Lucas A, Crystal-Ornelas, Robert, Damerow, Joan, Davidson, Kenneth J, De Kauwe, Martin G, Dietze, Michael C, Domingues, Tomas F, Dusenge, Mirindi Eric, Ellsworth, David S, Evans, John R, Gauthier, Paul PG, Gimenez, Bruno O, Gordon, Elizabeth P, Gough, Christopher M, Halbritter, Aud H, Hanson, David T, Heskel, Mary, Hogan, J Aaron, Hupp, Jason R, Jardine, Kolby, Kattge, Jens, Keenan, Trevor, Kromdijk, Johannes, Kumarathunge, Dushan P, Lamour, Julien, Leakey, Andrew DB, LeBauer, David S, Li, Qianyu, Lundgren, Marjorie R, McDowell, Nate, Meacham-Hensold, Katherine, Medlyn, Belinda E, Moore, David JP, Negrón-Juárez, Robinson, Niinemets, Ülo, Osborne, Colin P, Pivovaroff, Alexandria L, Poorter, Hendrik, Reed, Sasha C, Ryu, Youngryel, Sanz-Saez, Alvaro, Schmiege, Stephanie C, Serbin, Shawn P, Sharkey, Thomas D, Slot, Martijn, Smith, Nicholas G, Sonawane, Balasaheb V, South, Paul F, Souza, Daisy C, Stinziano, Joseph Ronald, Stuart-Haëntjens, Ellen, Taylor, Samuel H, Tejera, Mauricio D, Uddling, Johan, Vandvik, Vigdis, Varadharajan, Charuleka, Walker, Anthony P, Walker, Berkley J, Warren, Jeffrey M, Way, Danielle A, Wolfe, Brett T, Wu, Jin, Wullschleger, Stan D, Xu, Chonggang, Yan, Zhengbing, and Yang, Dedi
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Biological Sciences ,Ecology ,Data Science ,Photosynthesis ,Carbon dioxide ,Irradiance ,Data reporting format ,Metadata ,Data standard ,Information and Computing Sciences ,Biological sciences ,Information and computing sciences - Abstract
Leaf-level gas exchange data support the mechanistic understanding of plant fluxes of carbon and water. These fluxes inform our understanding of ecosystem function, are an important constraint on parameterization of terrestrial biosphere models, are necessary to understand the response of plants to global environmental change, and are integral to efforts to improve crop production. Collection of these data using gas analyzers can be both technically challenging and time consuming, and individual studies generally focus on a small range of species, restricted time periods, or limited geographic regions. The high value of these data is exemplified by the many publications that reuse and synthesize gas exchange data, however the lack of metadata and data reporting conventions make full and efficient use of these data difficult. Here we propose a reporting format for leaf-level gas exchange data and metadata to provide guidance to data contributors on how to store data in repositories to maximize their discoverability, facilitate their efficient reuse, and add value to individual datasets. For data users, the reporting format will better allow data repositories to optimize data search and extraction, and more readily integrate similar data into harmonized synthesis products. The reporting format specifies data table variable naming and unit conventions, as well as metadata characterizing experimental conditions and protocols. For common data types that were the focus of this initial version of the reporting format, i.e., survey measurements, dark respiration, carbon dioxide and light response curves, and parameters derived from those measurements, we took a further step of defining required additional data and metadata that would maximize the potential reuse of those data types. To aid data contributors and the development of data ingest tools by data repositories we provided a translation table comparing the outputs of common gas exchange instruments. Extensive consultation with data collectors, data users, instrument manufacturers, and data scientists was undertaken in order to ensure that the reporting format met community needs. The reporting format presented here is intended to form a foundation for future development that will incorporate additional data types and variables as gas exchange systems and measurement approaches advance in the future. The reporting format is published in the U.S. Department of Energy's ESS-DIVE data repository, with documentation and future development efforts being maintained in a version control system.
- Published
- 2021
5. Precipitation mediates sap flux sensitivity to evaporative demand in the neotropics
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Grossiord, Charlotte, Christoffersen, Bradley, Alonso-Rodríguez, Aura M, Anderson-Teixeira, Kristina, Asbjornsen, Heidi, Aparecido, Luiza Maria T, Carter Berry, Z, Baraloto, Christopher, Bonal, Damien, Borrego, Isaac, Burban, Benoit, Chambers, Jeffrey Q, Christianson, Danielle S, Detto, Matteo, Faybishenko, Boris, Fontes, Clarissa G, Fortunel, Claire, Gimenez, Bruno O, Jardine, Kolby J, Kueppers, Lara, Miller, Gretchen R, Moore, Georgianne W, Negron-Juarez, Robinson, Stahl, Clément, Swenson, Nathan G, Trotsiuk, Volodymyr, Varadharajan, Charu, Warren, Jeffrey M, Wolfe, Brett T, Wei, Liang, Wood, Tana E, Xu, Chonggang, and McDowell, Nate G
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Plant Biology ,Biological Sciences ,Ecology ,Droughts ,Forests ,Plant Transpiration ,Trees ,Vapor Pressure ,Water ,Evapotranspiration ,Plant functional traits ,Transpiration ,Vapor pressure deficit ,Evolutionary biology ,Zoology - Abstract
Transpiration in humid tropical forests modulates the global water cycle and is a key driver of climate regulation. Yet, our understanding of how tropical trees regulate sap flux in response to climate variability remains elusive. With a progressively warming climate, atmospheric evaporative demand [i.e., vapor pressure deficit (VPD)] will be increasingly important for plant functioning, becoming the major control of plant water use in the twenty-first century. Using measurements in 34 tree species at seven sites across a precipitation gradient in the neotropics, we determined how the maximum sap flux velocity (vmax) and the VPD threshold at which vmax is reached (VPDmax) vary with precipitation regime [mean annual precipitation (MAP); seasonal drought intensity (PDRY)] and two functional traits related to foliar and wood economics spectra [leaf mass per area (LMA); wood specific gravity (WSG)]. We show that, even though vmax is highly variable within sites, it follows a negative trend in response to increasing MAP and PDRY across sites. LMA and WSG exerted little effect on vmax and VPDmax, suggesting that these widely used functional traits provide limited explanatory power of dynamic plant responses to environmental variation within hyper-diverse forests. This study demonstrates that long-term precipitation plays an important role in the sap flux response of humid tropical forests to VPD. Our findings suggest that under higher evaporative demand, trees growing in wetter environments in humid tropical regions may be subjected to reduced water exchange with the atmosphere relative to trees growing in drier climates.
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- 2019
6. Climate and plant trait strategies determine tree carbon allocation to leaves and mediate future forest productivity
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Trugman, Anna T, Anderegg, Leander DL, Wolfe, Brett T, Birami, Benjamin, Ruehr, Nadine K, Detto, Matteo, Bartlett, Megan K, and Anderegg, William RL
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Plant Biology ,Biological Sciences ,Ecology ,Environmental Sciences ,Climate Action ,Carbon ,Carbon Cycle ,Forests ,Plant Leaves ,Trees ,aridity gradient ,carbon allocation ,climate change ,CO2 fertilization ,leaf area ,plant hydraulic traits ,sapwood area ,vegetation model ,Biological sciences ,Earth sciences ,Environmental sciences - Abstract
Forest leaf area has enormous leverage on the carbon cycle because it mediates both forest productivity and resilience to climate extremes. Despite widespread evidence that trees are capable of adjusting to changes in environment across both space and time through modifying carbon allocation to leaves, many vegetation models use fixed carbon allocation schemes independent of environment, which introduces large uncertainties into predictions of future forest responses to atmospheric CO2 fertilization and anthropogenic climate change. Here, we develop an optimization-based model, whereby tree carbon allocation to leaves is an emergent property of environment and plant hydraulic traits. Using a combination of meta-analysis, observational datasets, and model predictions, we find strong evidence that optimal hydraulic-carbon coupling explains observed patterns in leaf allocation across large environmental and CO2 concentration gradients. Furthermore, testing the sensitivity of leaf allocation strategy to a diversity in hydraulic and economic spectrum physiological traits, we show that plant hydraulic traits in particular have an enormous impact on the global change response of forest leaf area. Our results provide a rigorous theoretical underpinning for improving carbon cycle predictions through advancing model predictions of leaf area, and underscore that tree-level carbon allocation to leaves should be derived from first principles using mechanistic plant hydraulic processes in the next generation of vegetation models.
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- 2019
7. Homoeostatic maintenance of nonstructural carbohydrates during the 2015–2016 El Niño drought across a tropical forest precipitation gradient
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Dickman, Lee Turin, McDowell, Nate G, Grossiord, Charlotte, Collins, Adam D, Wolfe, Brett T, Detto, Matteo, Wright, S Joseph, Medina‐Vega, José A, Goodsman, Devin, Rogers, Alistair, Serbin, Shawn P, Wu, Jin, Ely, Kim S, Michaletz, Sean T, Xu, Chonggang, Kueppers, Lara, and Chambers, Jeffrey Q
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Plant Biology ,Biological Sciences ,Ecology ,Carbohydrates ,Droughts ,El Nino-Southern Oscillation ,Forests ,Panama ,Photosynthesis ,Plant Leaves ,Seasons ,Starch ,Sugars ,Trees ,Tropical Climate ,Wood ,climate ,ENSO ,NSC ,storage ,sugars ,tropics ,vegetation ,Agricultural and Veterinary Sciences ,Plant Biology & Botany ,Plant biology - Abstract
Nonstructural carbohydrates (NSCs) are essential for maintenance of plant metabolism and may be sensitive to short- and long-term climatic variation. NSC variation in moist tropical forests has rarely been studied, so regulation of NSCs in these systems is poorly understood. We measured foliar and branch NSC content in 23 tree species at three sites located across a large precipitation gradient in Panama during the 2015-2016 El Niño to examine how short- and long-term climatic variation impact carbohydrate dynamics. There was no significant difference in total NSCs as the drought progressed (leaf P = 0.32, branch P = 0.30) nor across the rainfall gradient (leaf P = 0.91, branch P = 0.96). Foliar soluble sugars decreased while starch increased over the duration of the dry period, suggesting greater partitioning of NSCs to storage than metabolism or transport as drought progressed. There was a large variation across species at all sites, but total foliar NSCs were positively correlated with leaf mass per area, whereas branch sugars were positively related to leaf temperature and negatively correlated with daily photosynthesis and wood density. The NSC homoeostasis across a wide range of conditions suggests that NSCs are an allocation priority in moist tropical forests.
- Published
- 2019
8. Monitoring leaf phenology in moist tropical forests by applying a superpixel-based deep learning method to time-series images of tree canopies
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Song, Guangqin, Wu, Shengbiao, Lee, Calvin K.F., Serbin, Shawn P., Wolfe, Brett T., Ng, Michael K., Ely, Kim S., Bogonovich, Marc, Wang, Jing, Lin, Ziyu, Saleska, Scott, Nelson, Bruce W., Rogers, Alistair, and Wu, Jin
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- 2022
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9. A metadata reporting framework (FRAMES) for synthesis of ecohydrological observations
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Christianson, Danielle S, Varadharajan, Charuleka, Christoffersen, Bradley, Detto, Matteo, Faybishenko, Boris, Gimenez, Bruno O, Hendrix, Val, Jardine, Kolby J, Negron-Juarez, Robinson, Pastorello, Gilberto Z, Powell, Thomas L, Sandesh, Megha, Warren, Jeffrey M, Wolfe, Brett T, Chambers, Jeffrey Q, Kueppers, Lara M, McDowell, Nathan G, and Agarwal, Deborah A
- Subjects
Information and Computing Sciences ,Networking and Information Technology R&D (NITRD) ,Metadata ,Data management system ,Model-data integration ,Data synthesis ,Data preservation ,Informatics ,Biological Sciences ,Ecology ,Biological sciences ,Information and computing sciences - Abstract
Metadata describe the ancillary information needed for data preservation and independent interpretation, comparison across heterogeneous datasets, and quality assessment and quality control (QA/QC). Environmental observations are vastly diverse in type and structure, can be taken across a wide range of spatiotemporal scales in a variety of measurement settings and approaches, and saved in multiple formats. Thus, well-organized, consistent metadata are required to produce usable data products from diverse environmental observations collected across field sites. However, existing metadata reporting protocols do not support the complex data synthesis and model-data integration needs of interdisciplinary earth system research. We developed a metadata reporting framework (FRAMES) to enable management and synthesis of observational data that are essential in advancing a predictive understanding of earth systems. FRAMES utilizes best practices for data and metadata organization enabling consistent data reporting and compatibility with a variety of standardized data protocols. We used an iterative scientist-centered design process to develop FRAMES, resulting in a data reporting format that incorporates existing field practices to maximize data-entry efficiency. Thus, FRAMES has a modular organization that streamlines metadata reporting and can be expanded to incorporate additional data types. With FRAMES's multi-scale measurement position hierarchy, data can be reported at observed spatial resolutions and then easily aggregated and linked across measurement types to support model-data integration. FRAMES is in early use by both data originators (persons generating data) and consumers (persons using data and metadata). In this paper, we describe FRAMES, identify lessons learned, and discuss areas of future development.
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- 2017
10. From the Arctic to the tropics : multibiome prediction of leaf mass per area using leaf reflectance
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Serbin, Shawn P., Wu, Jin, Ely, Kim S., Kruger, Eric L., Townsend, Philip A., Meng, Ran, Wolfe, Brett T., Chlus, Adam, Wang, Zhihui, and Rogers, Alistair
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- 2019
11. Leaf reflectance spectroscopy captures variation in carboxylation capacity across species, canopy environment and leaf age in lowland moist tropical forests
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Wu, Jin, Rogers, Alistair, Albert, Loren P., Ely, Kim, Prohaska, Neill, Wolfe, Brett T., Oliveira, Raimundo Cosme, Saleska, Scott R., and Serbin, Shawn P.
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- 2019
12. Diverse patterns of stored water use among saplings in seasonally dry tropical forests
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Wolfe, Brett T. and Kursar, Thomas A.
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- 2015
13. Short‐term variation in leaf‐level water use efficiency in a tropical forest
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Davidson, Kenneth J., primary, Lamour, Julien, additional, Rogers, Alistair, additional, Ely, Kim S., additional, Li, Qianyu, additional, McDowell, Nate G., additional, Pivovaroff, Alexandria L., additional, Wolfe, Brett T., additional, Wright, S. Joseph, additional, Zambrano, Alfonso, additional, and Serbin, Shawn P., additional
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- 2023
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14. Leaves as bottlenecks: The contribution of tree leaves to hydraulic resistance within the soil−plant−atmosphere continuum
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Wolfe, Brett T., primary, Detto, Matteo, additional, Zhang, Yong‐Jiang, additional, Anderson‐Teixeira, Kristina J., additional, Brodribb, Tim, additional, Collins, Adam D., additional, Crawford, Chloe, additional, Dickman, L. Turin, additional, Ely, Kim S., additional, Francisco, Jessica, additional, Gurry, Preston D., additional, Hancock, Haigan, additional, King, Christopher T., additional, Majekobaje, Adelodun R., additional, Mallett, Christian J., additional, McDowell, Nate G., additional, Mendheim, Zachary, additional, Michaletz, Sean T., additional, Myers, Daniel B., additional, Price, Ty J., additional, Rogers, Alistair, additional, Sack, Lawren, additional, Serbin, Shawn P., additional, Siddiq, Zafar, additional, Willis, David, additional, Wu, Jin, additional, Zailaa, Joseph, additional, and Wright, S. Joseph, additional
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- 2023
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15. Leaf habit affects the distribution of drought sensitivity but not water transport efficiency in the tropics
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Vargas G., German, primary, Kunert, Norbert, additional, Hammond, William M., additional, Berry, Z. Carter, additional, Werden, Leland K., additional, Smith‐Martin, Chris M., additional, Wolfe, Brett T., additional, Toro, Laura, additional, Mondragón‐Botero, Ariadna, additional, Pinto‐Ledezma, Jesús N., additional, Schwartz, Naomi B., additional, Uriarte, María, additional, Sack, Lawren, additional, Anderson‐Teixeira, Kristina J., additional, and Powers, Jennifer S., additional
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- 2022
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16. Fire resistance in a Caribbean dry forest: inferences from the allometry of bark thickness
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Wolfe, Brett T., Diaz, Gabriel E. Saldaña, and Van Bloem, Skip J.
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- 2014
17. Forest regeneration under Tectona grandis and Terminalia amazonia plantation stands managed for biodiversity conservation in western Panama
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Wolfe, Brett T., Dent, Daisy H., Deago, José, and Wishnie, Mark H.
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- 2015
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18. Food Quality, Competition, and Parasitism Influence Feeding Preference in a Neotropical Lepidopteran
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Kursar, Thomas A., Wolfe, Brett T., Epps, Mary Jane, and Coley, Phyllis D.
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- 2006
19. Feeding Preferences In A Neotropical Lepidopteran
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Kursar, Thomas A., Wolfe, Brett T., Epps, Mary Jane, and Coley, Phyllis D.
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- 2006
20. Hydraulic architecture explains species moisture dependency but not mortality rates across a tropical rainfall gradient
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Pivovaroff, Alexandria L., primary, Wolfe, Brett T., additional, McDowell, Nate, additional, Christoffersen, Bradley, additional, Davies, Stuart, additional, Dickman, L. Turin, additional, Grossiord, Charlotte, additional, Leff, Riley T., additional, Rogers, Alistair, additional, Serbin, Shawn P., additional, Wright, S. Joseph, additional, Wu, Jin, additional, Xu, Chonggang, additional, and Chambers, Jeffrey Q., additional
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- 2021
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21. Hydraulically-vulnerable trees survive on deep-water access during droughts in a tropical forest.
- Author
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Chitra-Tarak, Rutuja, Chitra-Tarak, Rutuja, Xu, Chonggang, Aguilar, Salomón, Anderson-Teixeira, Kristina J, Chambers, Jeff, Detto, Matteo, Faybishenko, Boris, Fisher, Rosie A, Knox, Ryan G, Koven, Charles D, Kueppers, Lara M, Kunert, Nobert, Kupers, Stefan J, McDowell, Nate G, Newman, Brent D, Paton, Steven R, Pérez, Rolando, Ruiz, Laurent, Sack, Lawren, Warren, Jeffrey M, Wolfe, Brett T, Wright, Cynthia, Wright, S Joseph, Zailaa, Joseph, McMahon, Sean M, Chitra-Tarak, Rutuja, Chitra-Tarak, Rutuja, Xu, Chonggang, Aguilar, Salomón, Anderson-Teixeira, Kristina J, Chambers, Jeff, Detto, Matteo, Faybishenko, Boris, Fisher, Rosie A, Knox, Ryan G, Koven, Charles D, Kueppers, Lara M, Kunert, Nobert, Kupers, Stefan J, McDowell, Nate G, Newman, Brent D, Paton, Steven R, Pérez, Rolando, Ruiz, Laurent, Sack, Lawren, Warren, Jeffrey M, Wolfe, Brett T, Wright, Cynthia, Wright, S Joseph, Zailaa, Joseph, and McMahon, Sean M
- Abstract
Deep-water access is arguably the most effective, but under-studied, mechanism that plants employ to survive during drought. Vulnerability to embolism and hydraulic safety margins can predict mortality risk at given levels of dehydration, but deep-water access may delay plant dehydration. Here, we tested the role of deep-water access in enabling survival within a diverse tropical forest community in Panama using a novel data-model approach. We inversely estimated the effective rooting depth (ERD, as the average depth of water extraction), for 29 canopy species by linking diameter growth dynamics (1990-2015) to vapor pressure deficit, water potentials in the whole-soil column, and leaf hydraulic vulnerability curves. We validated ERD estimates against existing isotopic data of potential water-access depths. Across species, deeper ERD was associated with higher maximum stem hydraulic conductivity, greater vulnerability to xylem embolism, narrower safety margins, and lower mortality rates during extreme droughts over 35 years (1981-2015) among evergreen species. Species exposure to water stress declined with deeper ERD indicating that trees compensate for water stress-related mortality risk through deep-water access. The role of deep-water access in mitigating mortality of hydraulically-vulnerable trees has important implications for our predictive understanding of forest dynamics under current and future climates.
- Published
- 2021
22. A reporting format for leaf-level gas exchange data and metadata
- Author
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Ely, Kim S., primary, Rogers, Alistair, additional, Agarwal, Deborah A., additional, Ainsworth, Elizabeth A., additional, Albert, Loren P., additional, Ali, Ashehad, additional, Anderson, Jeremiah, additional, Aspinwall, Michael J., additional, Bellasio, Chandra, additional, Bernacchi, Carl, additional, Bonnage, Steve, additional, Buckley, Thomas N., additional, Bunce, James, additional, Burnett, Angela C., additional, Busch, Florian A., additional, Cavanagh, Amanda, additional, Cernusak, Lucas A., additional, Crystal-Ornelas, Robert, additional, Damerow, Joan, additional, Davidson, Kenneth J., additional, De Kauwe, Martin G., additional, Dietze, Michael C., additional, Domingues, Tomas F., additional, Dusenge, Mirindi Eric, additional, Ellsworth, David S., additional, Evans, John R., additional, Gauthier, Paul P.G., additional, Gimenez, Bruno O., additional, Gordon, Elizabeth P., additional, Gough, Christopher M., additional, Halbritter, Aud H., additional, Hanson, David T., additional, Heskel, Mary, additional, Hogan, J. Aaron, additional, Hupp, Jason R., additional, Jardine, Kolby, additional, Kattge, Jens, additional, Keenan, Trevor, additional, Kromdijk, Johannes, additional, Kumarathunge, Dushan P., additional, Lamour, Julien, additional, Leakey, Andrew D.B., additional, LeBauer, David S., additional, Li, Qianyu, additional, Lundgren, Marjorie R., additional, McDowell, Nate, additional, Meacham-Hensold, Katherine, additional, Medlyn, Belinda E., additional, Moore, David J.P., additional, Negrón-Juárez, Robinson, additional, Niinemets, Ülo, additional, Osborne, Colin P., additional, Pivovaroff, Alexandria L., additional, Poorter, Hendrik, additional, Reed, Sasha C., additional, Ryu, Youngryel, additional, Sanz-Saez, Alvaro, additional, Schmiege, Stephanie C., additional, Serbin, Shawn P., additional, Sharkey, Thomas D., additional, Slot, Martijn, additional, Smith, Nicholas G., additional, Sonawane, Balasaheb V., additional, South, Paul F., additional, Souza, Daisy C., additional, Stinziano, Joseph Ronald, additional, Stuart-Haëntjens, Ellen, additional, Taylor, Samuel H., additional, Tejera, Mauricio D., additional, Uddling, Johan, additional, Vandvik, Vigdis, additional, Varadharajan, Charuleka, additional, Walker, Anthony P., additional, Walker, Berkley J., additional, Warren, Jeffrey M., additional, Way, Danielle A., additional, Wolfe, Brett T., additional, Wu, Jin, additional, Wullschleger, Stan D., additional, Xu, Chonggang, additional, Yan, Zhengbing, additional, and Yang, Dedi, additional
- Published
- 2021
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23. Appendix S1 and supplemental figures from Bark water vapour conductance is associated with drought performance in tropical trees
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Wolfe, Brett T.
- Abstract
Methodological details and supplemental figures
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- 2020
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24. Woody plants optimise stomatal behaviour relative to hydraulic risk
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Anderegg, William R. L., Wolf, Adam, Arango-Velez, Adriana, Choat, Brendan, Chmura, Daniel J., Jansen, Steven, Kolb, Thomas, Li, Shan, Meinzer, Frederick, Pita, Pilar, Resco de Dios, Víctor, Sperry, John S., Wolfe, Brett T., and Pacala, Stephen
- Subjects
0106 biological sciences ,0301 basic medicine ,Natural resource economics ,Plant hydraulics ,Biome ,Climate change ,Time horizon ,01 natural sciences ,Carbon cycle ,03 medical and health sciences ,Water Cycle ,Ecosystem ,Water cycle ,Water-use efficiency ,Ecology, Evolution, Behavior and Systematics ,2. Zero hunger ,Drought ,Ecology ,Empirical modelling ,Water ,Extreme events ,15. Life on land ,Droughts ,030104 developmental biology ,13. Climate action ,Plant Stomata ,Environmental science ,010606 plant biology & botany - Abstract
Stomatal response to environmental conditions forms the backbone of all ecosystem and carbon cycle models, but is largely based on empirical relationships. Evolutionary theories of stomatal behaviour are critical for guarding against prediction errors of empirical models under future climates. Longstanding theory holds that stomata maximise fitness by acting to maintain constant marginal water use efficiency over a given time horizon, but a recent evolutionary theory proposes that stomata instead maximise carbon gain minus carbon costs/risk of hydraulic damage. Using data from 34 species that span global forest biomes, we find that the recent carbon‐maximisation optimisation theory is widely supported, revealing that the evolution of stomatal regulation has not been primarily driven by attainment of constant marginal water use efficiency. Optimal control of stomata to manage hydraulic risk is likely to have significant consequences for ecosystem fluxes during drought, which is critical given projected intensification of the global hydrological cycle. W.R.L.A. acknowledges funding for this research from NSF 1714972 and from the USDA National Institute of Food and Agriculture, Agricultural and Food Research Initiative Competitive Programme, Ecosystem Services and Agro-Ecosystem Management, grant no. 2017-05521. We thank T. Brodribb and one anonymous reviewer for their insightful reviews, B. Medlyn and Y.S. Lin for sharing data and R. Norby for providing Vcmax data for several species. We appreciate the assistance from Marion Feifel in collecting data of leaf photosynthetic parameters of five European tree species. S.L. acknowledges financial support from the China Scholarship Council (CSC). VRD acknowledges funding from a Ram on y Cajal fellowship (RYC-2012-10970). B.T.W. was supported by the Next Generation Ecosystem Experiments-Tropics, funded by the U.S. Department of Energy, Office of Science, Office of Biological and Environmental Research. DJC acknowledges funding from the National Science Centre, Poland (NN309 713340).
- Published
- 2018
25. Bark water vapour conductance is associated with drought performance in tropical trees
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Wolfe, Brett T., primary
- Published
- 2020
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26. Tropical tree hydraulic responses to the 2015-2016 ENSO: A cross-site analysis and insights from a model
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Christoffersen, Bradley, Grossiord, Charlotte, Asbjornsen, Heidi, Carter Berry, Z., Bonal, Damien, Chambers, Jeffrey, Detto, Matteo, Faybishenko, Boris, Fisher, Rosie A., Fontes, Clarissa, FORTUNEL, Claire, Jardine, Kolby, Knox, Ryan, Koven, Charles D., Kueppers, Lara M., McDowell, Nate G., Medina-Vega, Jose A., Moore, Georgianne W., Negron-Juarez, Robinson, Stahl, Clement, Varadharajan, Charuleka, Warren, Jeffrey M., Wolfe, Brett T., Wright, S. Joseph, Wood, Tana E., Alonso-Rodriguez, Aura M., University of Texas Rio Grande Valley [Brownsville, TX] (UTRGV), Los Alamos National Laboratory (LANL), University of New Hampshire (UNH), Ecologie des forêts de Guyane (UMR ECOFOG), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-AgroParisTech-Université de Guyane (UG)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA), SILVA (SILVA), Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL)-AgroParisTech, Lawrence Berkeley National Laboratory [Berkeley] (LBNL), Princeton University, National Center for Atmospheric Research [Boulder] (NCAR), University of California [Berkeley], University of California, University of Texas at Austin, Institut de Recherche pour le Développement (IRD), United States Department of Energy, Pacific Northwest National Laboratory (PNNL), Wageningen University and Research Centre (WUR), Texas A&M University System, Oak Ridge National Laboratory, University of Utah, Smithsonian Tropical Research Institute, Forest Service, United States Department of Agriculture, and International Institute of Tropical Agriculture
- Subjects
[SDV]Life Sciences [q-bio] - Abstract
International audience; Background/Question/Methods Tropical forest responses to moisture remain poorly understood, in part because of the large diversity of plant hydraulic traits found therein. Changing moisture regimes, such as more frequent drought events, are expected to interact with these diverse hydraulic traits and other requirements of tropical trees in complex ways, making prediction of ecosystem-scale responses and community compositional trajectories difficult. A first step towards discerning such responses is in the analysis of how plant hydraulic and edaphic conditions control trajectories of individual trees’ water use over pre-drought, drought, and recovery periods. We took advantage of the 2015-2016 ENSO event, which induced drought over much of the tropics, to collect sap flow data on 47 canopy and numerous sub-canopy trees across nine sites in Latin America varying in annual precipitation from 1700 mm to > 3000 mm. This enabled us to determine a range of responses to changes in moisture, both atmospheric (VPD) and in soil. Where available, via measurements on conspecific individuals or species-mean values in trait databases, plant hydraulic traits were associated with individual sap flux trajectories, in addition to site-specific soil properties and climate. Results/Conclusions We found a large heterogeneity of sap flow responses during the ENSO within and among study regions. The diversity of strategies to deal with drought stress was partially explained by species functional traits, background climate and intensity of soil water depletion during the ENSO. Preliminary simulations of drought responses using the Community Land Model coupled to the hydraulically-enabled Functionally Assembled Terrestrial Ecosystem Simulator (CLM-FATES-Hydro) were used to demonstrate multiple mechanisms, both edaphic- and plant trait-related, responsible for the divergence in observed sap flow responses, as well as highlight critical field measurements needed to discern among these mechanisms.
- Published
- 2018
27. The response of stomatal conductance to seasonal drought in tropical forests
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Wu, Jin, primary, Serbin, Shawn P., additional, Ely, Kim S., additional, Wolfe, Brett T., additional, Dickman, L. Turin, additional, Grossiord, Charlotte, additional, Michaletz, Sean T., additional, Collins, Adam D., additional, Detto, Matteo, additional, McDowell, Nate G., additional, Wright, S. Joseph, additional, and Rogers, Alistair, additional
- Published
- 2019
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28. Seed rain along a gradient of degradation in Caribbean dry forest: effects of dispersal limitation on the trajectory of forest recovery
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Wolfe, Brett T., primary, Macchiavelli, Raúl, additional, and Van Bloem, Skip J., additional
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- 2019
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29. The response of stomatal conductance to seasonal drought in tropical forests.
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Wu, Jin, Serbin, Shawn P., Ely, Kim S., Wolfe, Brett T., Dickman, L. Turin, Grossiord, Charlotte, Michaletz, Sean T., Collins, Adam D., Detto, Matteo, McDowell, Nate G., Wright, S. Joseph, and Rogers, Alistair
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TROPICAL forests ,DROUGHT management ,DROUGHTS ,THROUGHFALL ,VAPOR pressure ,HUMIDITY ,TROPICAL dry forests - Abstract
Stomata regulate CO2 uptake for photosynthesis and water loss through transpiration. The approaches used to represent stomatal conductance (gs) in models vary. In particular, current understanding of drivers of the variation in a key parameter in those models, the slope parameter (i.e. a measure of intrinsic plant water‐use‐efficiency), is still limited, particularly in the tropics. Here we collected diurnal measurements of leaf gas exchange and leaf water potential (Ψleaf), and a suite of plant traits from the upper canopy of 15 tropical trees in two contrasting Panamanian forests throughout the dry season of the 2016 El Niño. The plant traits included wood density, leaf‐mass‐per‐area (LMA), leaf carboxylation capacity (Vc,max), leaf water content, the degree of isohydry, and predawn Ψleaf. We first investigated how the choice of four commonly used leaf‐level gs models with and without the inclusion of Ψleaf as an additional predictor variable influence the ability to predict gs, and then explored the abiotic (i.e. month, site‐month interaction) and biotic (i.e. tree‐species‐specific characteristics) drivers of slope parameter variation. Our results show that the inclusion of Ψleaf did not improve model performance and that the models that represent the response of gs to vapor pressure deficit performed better than corresponding models that respond to relative humidity. Within each gs model, we found large variation in the slope parameter, and this variation was attributable to the biotic driver, rather than abiotic drivers. We further investigated potential relationships between the slope parameter and the six available plant traits mentioned above, and found that only one trait, LMA, had a significant correlation with the slope parameter (R2 = 0.66, n = 15), highlighting a potential path towards improved model parameterization. This study advances understanding of gs dynamics over seasonal drought, and identifies a practical, trait‐based approach to improve modeling of carbon and water exchange in tropical forests. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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30. A metadata reporting framework (FRAMES) for synthesis of ecohydrological observations
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Christianson, Danielle S., primary, Varadharajan, Charuleka, additional, Christoffersen, Bradley, additional, Detto, Matteo, additional, Faybishenko, Boris, additional, Gimenez, Bruno O., additional, Hendrix, Val, additional, Jardine, Kolby J., additional, Negron-Juarez, Robinson, additional, Pastorello, Gilberto Z., additional, Powell, Thomas L., additional, Sandesh, Megha, additional, Warren, Jeffrey M., additional, Wolfe, Brett T., additional, Chambers, Jeffrey Q., additional, Kueppers, Lara M., additional, McDowell, Nathan G., additional, and Agarwal, Deborah A., additional
- Published
- 2017
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31. Plant water potential improves prediction of empirical stomatal models
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Anderegg, William R. L., primary, Wolf, Adam, additional, Arango-Velez, Adriana, additional, Choat, Brendan, additional, Chmura, Daniel J., additional, Jansen, Steven, additional, Kolb, Thomas, additional, Li, Shan, additional, Meinzer, Frederick, additional, Pita, Pilar, additional, Resco de Dios, Víctor, additional, Sperry, John S., additional, Wolfe, Brett T., additional, and Pacala, Stephen, additional
- Published
- 2017
- Full Text
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32. Retention of stored water enables tropical tree saplings to survive extreme drought conditions
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Wolfe, Brett T., primary and Goldstein, Guillermo, primary
- Published
- 2017
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33. Does leaf shedding protect stems from cavitation during seasonal droughts? A test of the hydraulic fuse hypothesis
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Wolfe, Brett T., primary, Sperry, John S., additional, and Kursar, Thomas A., additional
- Published
- 2016
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34. Pragmatic hydraulic theory predicts stomatal responses to climatic water deficits
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Sperry, John S., primary, Wang, Yujie, additional, Wolfe, Brett T., additional, Mackay, D. Scott, additional, Anderegg, William R. L., additional, McDowell, Nate G., additional, and Pockman, William T., additional
- Published
- 2016
- Full Text
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35. Forest regeneration under Tectona grandis and Terminalia amazonia plantation stands managed for biodiversity conservation in western Panama
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Wolfe, Brett T., primary, Dent, Daisy H., additional, Deago, José, additional, and Wishnie, Mark H., additional
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- 2014
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36. Subtropical dry forest regeneration in grass-invaded areas of Puerto Rico: Understanding why Leucaena leucocephala dominates and native species fail
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Wolfe, Brett T., primary and Van Bloem, Skip J., additional
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- 2012
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37. Hydraulic architecture explains species moisture dependency but not mortality rates across a tropical rainfall gradient
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Pivovaroff, Alexandria L., Wolfe, Brett T., McDowell, Nate, Christoffersen, Bradley, Davies, Stuart, Dickman, L. Turin, Grossiord, Charlotte, Leff, Riley T., Rogers, Alistair, Serbin, Shawn P., Wright, S. Joseph, Wu, Jin, Xu, Chonggang, and Chambers, Jeffrey Q.
- Subjects
fungi ,food and beverages - Abstract
Intensified droughts are affecting tropical forests across the globe. However, the underlying mechanisms of tree drought response and mortality are poorly understood. Hydraulic traits and especially hydraulic safety margins (HSMs), that is, the extent to which plants buffer themselves from thresholds of water stress, provide insights into species-specific drought vulnerability. We investigated hydraulic traits during an intense drought triggered by the 2015–2016 El Niño on 27 canopy tree species across three tropical forest sites with differing precipitation. We capitalized on the drought event as a time when plant water status might approach or exceed thresholds of water stress. We investigated the degree to which these traits varied across the rainfall gradient, as well as relationships among hydraulic traits and species-specific optimal moisture and mortality rates. There were no differences among sites for any measured trait. There was strong coordination among traits, with a network analysis revealing two major groups of coordinated traits. In one group, there were water potentials, turgor loss point, sapwood capacitance and density, HSMs, and mortality rate. In the second group, there was leaf mass per area, leaf dry matter content, hydraulic architecture (leaf area to sapwood area ratio), and species-specific optimal moisture. These results demonstrated that while species with greater safety from turgor loss had lower mortality rates, hydraulic architecture was the only trait that explained species’ moisture dependency. Species with a greater leaf area to sapwood area ratio were associated with drier sites and reduced their transpirational demand during the dry season via deciduousness.
38. Leaves as bottlenecks: The contribution of tree leaves to hydraulic resistance within the soil-plant-atmosphere continuum.
- Author
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Wolfe BT, Detto M, Zhang YJ, Anderson-Teixeira KJ, Brodribb T, Collins AD, Crawford C, Dickman LT, Ely KS, Francisco J, Gurry PD, Hancock H, King CT, Majekobaje AR, Mallett CJ, McDowell NG, Mendheim Z, Michaletz ST, Myers DB, Price TJ, Rogers A, Sack L, Serbin SP, Siddiq Z, Willis D, Wu J, Zailaa J, and Wright SJ
- Subjects
- Water physiology, Plant Transpiration physiology, Plant Leaves physiology, Trees physiology, Soil
- Abstract
Within vascular plants, the partitioning of hydraulic resistance along the soil-to-leaf continuum affects transpiration and its response to environmental conditions. In trees, the fractional contribution of leaf hydraulic resistance (R
leaf ) to total soil-to-leaf hydraulic resistance (Rtotal ), or fRleaf (=Rleaf /Rtotal ), is thought to be large, but this has not been tested comprehensively. We compiled a multibiome data set of fRleaf using new and previously published measurements of pressure differences within trees in situ. Across 80 samples, fRleaf averaged 0.51 (95% confidence interval [CI] = 0.46-0.57) and it declined with tree height. We also used the allometric relationship between field-based measurements of soil-to-leaf hydraulic conductance and laboratory-based measurements of leaf hydraulic conductance to compute the average fRleaf for 19 tree samples, which was 0.40 (95% CI = 0.29-0.56). The in situ technique produces a more accurate descriptor of fRleaf because it accounts for dynamic leaf hydraulic conductance. Both approaches demonstrate the outsized role of leaves in controlling tree hydrodynamics. A larger fRleaf may help stems from loss of hydraulic conductance. Thus, the decline in fRleaf with tree height would contribute to greater drought vulnerability in taller trees and potentially to their observed disproportionate drought mortality., (© 2022 John Wiley & Sons Ltd.)- Published
- 2023
- Full Text
- View/download PDF
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