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2. Environmental controls on the light use efficiency of terrestrial gross primary production

Author

Bloomfield, Keith J, Stocker, Benjamin D, Keenan, Trevor F, and Prentice, I Colin

Subjects
Plant Biology, Biological Sciences, Environmental Sciences, Climate Change Impacts and Adaptation, Ecosystem, Photosynthesis, Climate, Carbon Cycle, Temperature, Seasons, diffuse radiation, eddy covariance, FLUXNET, light use efficiency, soil moisture, temperature, terrestrial biosphere model, vapor pressure deficit, Ecology, Biological sciences, Earth sciences, Environmental sciences
Abstract

Gross primary production (GPP) by terrestrial ecosystems is a key quantity in the global carbon cycle. The instantaneous controls of leaf-level photosynthesis are well established, but there is still no consensus on the mechanisms by which canopy-level GPP depends on spatial and temporal variation in the environment. The standard model of photosynthesis provides a robust mechanistic representation for C3 species; however, additional assumptions are required to "scale up" from leaf to canopy. As a consequence, competing models make inconsistent predictions about how GPP will respond to continuing environmental change. This problem is addressed here by means of an empirical analysis of the light use efficiency (LUE) of GPP inferred from eddy covariance carbon dioxide flux measurements, in situ measurements of photosynthetically active radiation (PAR), and remotely sensed estimates of the fraction of PAR (fAPAR) absorbed by the vegetation canopy. Focusing on LUE allows potential drivers of GPP to be separated from its overriding dependence on light. GPP data from over 100 sites, collated over 20 years and located in a range of biomes and climate zones, were extracted from the FLUXNET2015 database and combined with remotely sensed fAPAR data to estimate daily LUE. Daytime air temperature, vapor pressure deficit, diffuse fraction of solar radiation, and soil moisture were shown to be salient predictors of LUE in a generalized linear mixed-effects model. The same model design was fitted to site-based LUE estimates generated by 16 terrestrial ecosystem models. The published models showed wide variation in the shape, the strength, and even the sign of the environmental effects on modeled LUE. These findings highlight important model deficiencies and suggest a need to progress beyond simple "goodness of fit" comparisons of inferred and predicted carbon fluxes toward an approach focused on the functional responses of the underlying dependencies.

Published
2023

5. Convergence in phosphorus constraints to photosynthesis in forests around the world

Author

Ellsworth, David S, Crous, Kristine Y, De Kauwe, Martin G, Verryckt, Lore T, Goll, Daniel, Zaehle, Sönke, Bloomfield, Keith J, Ciais, Philippe, Cernusak, Lucas A, Domingues, Tomas F, Dusenge, Mirindi Eric, Garcia, Sabrina, Guerrieri, Rossella, Ishida, F Yoko, Janssens, Ivan A, Kenzo, Tanaka, Ichie, Tomoaki, Medlyn, Belinda E, Meir, Patrick, Norby, Richard J, Reich, Peter B, Rowland, Lucy, Santiago, Louis S, Sun, Yan, Uddling, Johan, Walker, Anthony P, Weerasinghe, KW Lasantha K, van de Weg, Martine J, Zhang, Yun-Bing, Zhang, Jiao-Lin, and Wright, Ian J

Subjects
Carbon, Forests, Phosphorus, Photosynthesis, Plant Leaves, Trees
Abstract

Tropical forests take up more carbon (C) from the atmosphere per annum by photosynthesis than any other type of vegetation. Phosphorus (P) limitations to C uptake are paramount for tropical and subtropical forests around the globe. Yet the generality of photosynthesis-P relationships underlying these limitations are in question, and hence are not represented well in terrestrial biosphere models. Here we demonstrate the dependence of photosynthesis and underlying processes on both leaf N and P concentrations. The regulation of photosynthetic capacity by P was similar across four continents. Implementing P constraints in the ORCHIDEE-CNP model, gross photosynthesis was reduced by 36% across the tropics and subtropics relative to traditional N constraints and unlimiting leaf P. Our results provide a quantitative relationship for the P dependence for photosynthesis for the front-end of global terrestrial C models that is consistent with canopy leaf measurements.

Published
2022

6. AusTraits, a curated plant trait database for the Australian flora

Author

Falster, Daniel, Gallagher, Rachael, Wenk, Elizabeth H, Wright, Ian J, Indiarto, Dony, Andrew, Samuel C, Baxter, Caitlan, Lawson, James, Allen, Stuart, Fuchs, Anne, Monro, Anna, Kar, Fonti, Adams, Mark A, Ahrens, Collin W, Alfonzetti, Matthew, Angevin, Tara, Apgaua, Deborah MG, Arndt, Stefan, Atkin, Owen K, Atkinson, Joe, Auld, Tony, Baker, Andrew, von Balthazar, Maria, Bean, Anthony, Blackman, Chris J, Bloomfield, Keith, Bowman, David MJS, Bragg, Jason, Brodribb, Timothy J, Buckton, Genevieve, Burrows, Geoff, Caldwell, Elizabeth, Camac, James, Carpenter, Raymond, Catford, Jane A, Cawthray, Gregory R, Cernusak, Lucas A, Chandler, Gregory, Chapman, Alex R, Cheal, David, Cheesman, Alexander W, Chen, Si-Chong, Choat, Brendan, Clinton, Brook, Clode, Peta L, Coleman, Helen, Cornwell, William K, Cosgrove, Meredith, Crisp, Michael, Cross, Erika, Crous, Kristine Y, Cunningham, Saul, Curran, Timothy, Curtis, Ellen, Daws, Matthew I, DeGabriel, Jane L, Denton, Matthew D, Dong, Ning, Du, Pengzhen, Duan, Honglang, Duncan, David H, Duncan, Richard P, Duretto, Marco, Dwyer, John M, Edwards, Cheryl, Esperon-Rodriguez, Manuel, Evans, John R, Everingham, Susan E, Farrell, Claire, Firn, Jennifer, Fonseca, Carlos Roberto, French, Ben J, Frood, Doug, Funk, Jennifer L, Geange, Sonya R, Ghannoum, Oula, Gleason, Sean M, Gosper, Carl R, Gray, Emma, Groom, Philip K, Grootemaat, Saskia, Gross, Caroline, Guerin, Greg, Guja, Lydia, Hahs, Amy K, Harrison, Matthew Tom, Hayes, Patrick E, Henery, Martin, Hochuli, Dieter, Howell, Jocelyn, Huang, Guomin, Hughes, Lesley, Huisman, John, Ilic, Jugoslav, Jagdish, Ashika, Jin, Daniel, Jordan, Gregory, Jurado, Enrique, Kanowski, John, and Kasel, Sabine

Subjects
Plant Biology, Biological Sciences, Ecology, Australia, Databases, Factual, Phenotype, Plant Physiological Phenomena, Plants
Abstract

We introduce the AusTraits database - a compilation of values of plant traits for taxa in the Australian flora (hereafter AusTraits). AusTraits synthesises data on 448 traits across 28,640 taxa from field campaigns, published literature, taxonomic monographs, and individual taxon descriptions. Traits vary in scope from physiological measures of performance (e.g. photosynthetic gas exchange, water-use efficiency) to morphological attributes (e.g. leaf area, seed mass, plant height) which link to aspects of ecological variation. AusTraits contains curated and harmonised individual- and species-level measurements coupled to, where available, contextual information on site properties and experimental conditions. This article provides information on version 3.0.2 of AusTraits which contains data for 997,808 trait-by-taxon combinations. We envision AusTraits as an ongoing collaborative initiative for easily archiving and sharing trait data, which also provides a template for other national or regional initiatives globally to fill persistent gaps in trait knowledge.

Published
2021

9. Historical changes in the stomatal limitation of photosynthesis : empirical support for an optimality principle

Author

Lavergne, Aliénor, Voelker, Steve, Csank, Adam, Graven, Heather, de Boer, Hugo J., Daux, Valérie, Robertson, Iain, Dorado-Liñán, Isabel, Martínez-Sancho, Elisabet, Battipaglia, Giovanna, Bloomfield, Keith J., Still, Christopher J., Meinzer, Frederick C., Dawson, Todd E., Camarero, J. Julio, Clisby, Rory, Fang, Yunting, Menzel, Annette, Keen, Rachel M., Roden, John S., and Prentice, I. Colin

Published
2020

11. The validity of optimal leaf traits modelled on environmental conditions

Author

Bloomfield, Keith J., Prentice, I. Colin, Cernusak, Lucas A., Eamus, Derek, Medlyn, Belinda E., Rumman, Rizwana, Wright, Ian J., Boer, Matthias M., Cale, Peter, Cleverly, James, Egerton, John J. G., Ellsworth, David S., Evans, Bradley J., Hayes, Lucy S., Hutchinson, Michael F., Liddell, Michael J., Macfarlane, Craig, Meyer, Wayne S., Togashi, Henrique F., Wardlaw, Tim, Zhu, Lingling, and Atkin, Owen K.

Published
2019

12. A continental-scale assessment of variability in leaf traits : Within species, across sites and between seasons

Author

Bloomfield, Keith J., Cernusak, Lucas A., Eamus, Derek, Ellsworth, David S., Prentice, I. Colin, Wright, Ian J., Boer, Matthias M., Bradford, Matt G., Cale, Peter, Cleverly, James, Egerton, John J. G., Evans, Bradley J., Hayes, Lucy S., Hutchinson, Michael F., Liddell, Michael J., Macfarlane, Craig, Meyer, Wayne S., Prober, Suzanne M., Togashi, Henrique F., Wardlaw, Tim, Zhu, Lingling, and Atkin, Owen K.

Published
2018

14. The nature of photosynthetic phosphorus limitations for tropical tree species

Author

Bloomfield, Keith John

Subjects
631.416
Abstract

Tropical soils are often characterised by low phosphorus availability prompting the view that the productivity of many tropical forests may be phosphorus (P) rather than nitrogen (N) limited. Nevertheless, to date, no study has assessed the mechanisms by which P-deficiency might be limiting rates of photosynthesis in tropical trees. A controlled glasshouse experiment investigated the effect of P deficiency on rates of photosynthesis (A) and related leaf traits for seven Australian tropical tree species drawn from different plant functional types (pFTs) thought to differ in their photosynthesis/nutrient relationships. Measurements of gas exchange and leaf structure were combined with laboratory assays ofleaf nutrients; subsequent field campaigns were conducted in tropical Queensland (also comparing forest with savanna), Peru and French Guiana. The greenhouse results showed that the A- [N] relationship is affected by P supply, but PFT effects were not as predicted and in Queensland savanna species were found to have higher photosynthetic N use efficiency compared with forest trees - despite lower leaf [P]. In South America, an expected cross-basin gradient in P availability was' confirmed with higher [P] for the Peruvian trees, but Ama.'{ did not differ between the two Peruvian plots despite a 48% increase in mean [P]. The combined field dataset, including more than 80 species, allowed novel cross-continental comparisons of major leaf fractions of P and N - these were found to differ at each hierarchical level: country, site and species. Attempts to define a unifying photosynthetic model for tropical trees confirmed a dominant role for N, but with a critical role for P also invoked. Model performance was, however, improved by allowing for specific geographic and phylogenetic effects. A current lack of understanding as to the basis of these unexplained phytogeograhic effects on photosynthesis/nutrient relationships constitutes a major obstacle in the development of universally-applicable large-scale photosynthesis models.

Published
2012

15. Leaf Respiration in Terrestrial Biosphere Models

Author

Atkin, Owen K., Bahar, Nur H. A., Bloomfield, Keith J., Griffin, Kevin L., Heskel, Mary A., Huntingford, Chris, de la Torre, Alberto Martinez, Turnbull, Matthew H., Govindjee, Series Editor, Sharkey, Thomas D., Series Editor, Tcherkez, Guillaume, editor, and Ghashghaie, Jaleh, editor

Published
2017
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16. Global terrestrial nitrogen uptake and nitrogen use efficiency

Author

Peng, Yunke, primary, Prentice, Iain Colin, additional, Bloomfield, Keith J., additional, Campioli, Matteo, additional, Guo, Zhiwen, additional, Sun, Yuanfeng, additional, Tian, Di, additional, Wang, Xiangping, additional, Vicca, Sara, additional, and Stocker, Benjamin D., additional

Published
2023
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17. REPLY TO ADAMS ET AL. : Empirical versus process-based approaches to modeling temperature responses of leaf respiration

Author

Heskel, Mary A., Atkin, Owen K., O’Sullivan, Odhran S., Reich, Peter, Tjoelker, Mark G., Weerasinghe, Lasantha K., Penillard, Aurore, Egerton, John J. G., Creek, Danielle, Bloomfield, Keith J., Xiang, Jen, Sinca, Felipe, Stangl, Zsofia R., Martinez-de la Torre, Alberto, Griffin, Kevin L., Huntingford, Chris, Hurry, Vaughan, Meir, Patrick, and Turnbull, Matthew H.

Published
2016

20. Environmental controls on the light use efficiency of terrestrial gross primary production

Author

Bloomfield, Keith J., Stocker, Benjamin D., Keenan, Trevor F., and Prentice, I. Colin

Subjects
Global and Planetary Change, Ecology, FLUXNET, vapor pressure deficit, eddy covariance, temperature, Environmental Chemistry, light use efficiency, soil moisture, diffuse radiation, terrestrial biosphere model, General Environmental Science
Abstract

Gross primary production (GPP) by terrestrial ecosystems is a key quantity in the global carbon cycle. The instantaneous controls of leaf-level photosynthesis are well established, but there is still no consensus on the mechanisms by which canopy-level GPP depends on spatial and temporal variation in the environment. The standard model of photosynthesis provides a robust mechanistic representation for C-3 species; however, additional assumptions are required to "scale up " from leaf to canopy. As a consequence, competing models make inconsistent predictions about how GPP will respond to continuing environmental change. This problem is addressed here by means of an empirical analysis of the light use efficiency (LUE) of GPP inferred from eddy covariance carbon dioxide flux measurements, in situ measurements of photosynthetically active radiation (PAR), and remotely sensed estimates of the fraction of PAR (fAPAR) absorbed by the vegetation canopy. Focusing on LUE allows potential drivers of GPP to be separated from its overriding dependence on light. GPP data from over 100 sites, collated over 20 years and located in a range of biomes and climate zones, were extracted from the FLUXNET2015 database and combined with remotely sensed fAPAR data to estimate daily LUE. Daytime air temperature, vapor pressure deficit, diffuse fraction of solar radiation, and soil moisture were shown to be salient predictors of LUE in a generalized linear mixed-effects model. The same model design was fitted to site-based LUE estimates generated by 16 terrestrial ecosystem models. The published models showed wide variation in the shape, the strength, and even the sign of the environmental effects on modeled LUE. These findings highlight important model deficiencies and suggest a need to progress beyond simple "goodness of fit " comparisons of inferred and predicted carbon fluxes toward an approach focused on the functional responses of the underlying dependencies., Global Change Biology, 29 (4), ISSN:1354-1013, ISSN:1365-2486

Published
2023

23. Coordination of photosynthetic traits across soil and climate gradients

Author

Westerband, Andrea C., primary, Wright, Ian J., additional, Maire, Vincent, additional, Paillassa, Jennifer, additional, Prentice, Iain Colin, additional, Atkin, Owen K., additional, Bloomfield, Keith J., additional, Cernusak, Lucas A., additional, Dong, Ning, additional, Gleason, Sean M., additional, Guilherme Pereira, Caio, additional, Lambers, Hans, additional, Leishman, Michelle R., additional, Malhi, Yadvinder, additional, and Nolan, Rachael H., additional

Published
2022
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24. Global terrestrial nitrogen uptake and nitrogen use efficiency

Author

Peng, Yunke, primary, Prentice, Iain Colin, additional, Bloomfield, Keith J., additional, Campioli, Matteo, additional, Guo, Zhiwen, additional, Sun, Yuanfeng, additional, Tian, Di, additional, Wang, Xiangping, additional, Vicca, Sara, additional, and Stocker, Benjamin D., additional

Published
2022
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26. Leaf nitrogen from the perspective of optimal plant function

Author

Dong, Ning, primary, Prentice, Iain Colin, additional, Wright, Ian J., additional, Wang, Han, additional, Atkin, Owen K., additional, Bloomfield, Keith J., additional, Domingues, Tomas F., additional, Gleason, Sean M., additional, Maire, Vincent, additional, Onoda, Yusuke, additional, Poorter, Hendrik, additional, and Smith, Nicholas G., additional

Published
2022
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29. Remote sensing of tropical vegetation properties in response to fire return time

Author

Ningthoujam, Ramesh K., primary, Prestes, Nayane Cristina Candida dos Santos, additional, Andrade, Marcelo Feitosa de, additional, Carniello, Maria Antonia, additional, Coetsee, Corli Wigley, additional, Harrison, Mark E., additional, Kusin, Kitso, additional, Rasul, Azad, additional, Hoscilo, Agata, additional, Pellegrini, Adam, additional, Oliveras, Imma, additional, Feldpausch, Ted R., additional, Page, Susan, additional, Bloomfield, Keith J., additional, Harrison, Sandy P., additional, and Prentice, Iain Colin, additional

Published
2022
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31. Understanding and modelling wildfire regimes: an ecological perspective

Author

Harrison, Sandy P, primary, Prentice, I Colin, additional, Bloomfield, Keith J, additional, Dong, Ning, additional, Forkel, Matthias, additional, Forrest, Matthew, additional, Ningthoujam, Ramesh K, additional, Pellegrini, Adam, additional, Shen, Yicheng, additional, Baudena, Mara, additional, Cardoso, Anabelle W, additional, Huss, Jessica C, additional, Joshi, Jaideep, additional, Oliveras, Imma, additional, Pausas, Juli G, additional, and Simpson, Kimberley J, additional

Published
2021
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33. Coordination of photosynthetic traits across soil and climate gradients.

Author

Westerband, Andrea C., Wright, Ian J., Maire, Vincent, Paillassa, Jennifer, Prentice, Iain Colin, Atkin, Owen K., Bloomfield, Keith J., Cernusak, Lucas A., Dong, Ning, Gleason, Sean M., Guilherme Pereira, Caio, Lambers, Hans, Leishman, Michelle R., Malhi, Yadvinder, and Nolan, Rachael H.

Subjects
SOILS, WATER vapor, PLANT-water relationships, PHOTOSYNTHETIC rates, MAINTENANCE costs, SOIL acidity
Abstract

"Least‐cost theory" posits that C3 plants should balance rates of photosynthetic water loss and carboxylation in relation to the relative acquisition and maintenance costs of resources required for these activities. Here we investigated the dependency of photosynthetic traits on climate and soil properties using a new Australia‐wide trait dataset spanning 528 species from 67 sites. We tested the hypotheses that plants on relatively cold or dry sites, or on relatively more fertile sites, would typically operate at greater CO2 drawdown (lower ratio of leaf internal to ambient CO2, Ci:Ca) during light‐saturated photosynthesis, and at higher leaf N per area (Narea) and higher carboxylation capacity (Vcmax 25) for a given rate of stomatal conductance to water vapour, gsw. These results would be indicative of plants having relatively higher water costs than nutrient costs. In general, our hypotheses were supported. Soil total phosphorus (P) concentration and (more weakly) soil pH exerted positive effects on the Narea–gsw and Vcmax 25–gsw slopes, and negative effects on Ci:Ca. The P effect strengthened when the effect of climate was removed via partial regression. We observed similar trends with increasing soil cation exchange capacity and clay content, which affect soil nutrient availability, and found that soil properties explained similar amounts of variation in the focal traits as climate did. Although climate typically explained more trait variation than soil did, together they explained up to 52% of variation in the slope relationships and soil properties explained up to 30% of the variation in individual traits. Soils influenced photosynthetic traits as well as their coordination. In particular, the influence of soil P likely reflects the Australia's geologically ancient low‐relief landscapes with highly leached soils. Least‐cost theory provides a valuable framework for understanding trade‐offs between resource costs and use in plants, including limiting soil nutrients. [ABSTRACT FROM AUTHOR]

Published
2023
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34. AusTraits – a curated plant trait database for the Australian flora

Author

Falster, Daniel ; https://orcid.org/0000-0002-9814-092X, Gallagher, Rachael, Wenk, Elizabeth, Wright, Ian, Indiarto, Dony ; https://orcid.org/0000-0001-9546-8201, Baxter, Caitlan, Andrew, Samuel C, Lawson, James, Allen, Stuart, Fuchs, Anne, Adams, Mark A, Ahrens, Collin W ; https://orcid.org/0000-0002-0614-9928, Alfonzetti, Matthew, Angevin, Tara, Atkin, Owen K, Auld, Tony ; https://orcid.org/0000-0002-8766-2829, Baker, Andrew, Bean, Anthony, Blackman, Chris J, Bloomfield, Keith, Bowman, David, Bragg, Jason ; https://orcid.org/0000-0002-7621-7295, Brodribb, Timothy J, Buckton, Genevieve, Burrows, Geoff, Caldwell, Elizabeth, Camac, James, Carpenter, Raymond, Catford, Jane A, Cawthray, Gregory R, Cernusak, Lucas A, Chandler, Gregory, Chapman, Alex R, Cheal, David, Cheesman, Alexander W, Chen, Si-Chong, Choat, Brendan, Clinton, Brook, Clode, Peta, Coleman, Helen, Cornwell, William K ; https://orcid.org/0000-0003-4080-4073, Cosgrove, Meredith, Crisp, Michael, Cross, Erika, Crous, Kristine Y, Cunningham, Saul, Curtis, Ellen, Daws, Matthew I, DeGabriel, Jane L, Denton, Matthew D, Dong, Ning, Duan, Honglang, Duncan, David H, Duncan, Richard P, Duretto, Marco, Dwyer, John M, Edwards, Cheryl, Esperon-Rodriguez, Manuel, Evans, John R, Everingham, Susan E, Firn, Jennifer, Fonseca, Carlos Roberto, French, Ben J, Frood, Doug, Funk, Jennifer L, Geange, Sonya R, Ghannoum, Oula ; https://orcid.org/0000-0002-1341-0741, Gleason, Sean M, Gosper, Carl R, Gray, Emma, Groom, Philip K, Gross, Caroline, Guerin, Greg, Guja, Lydia, Hahs, Amy K, Harrison, Matthew Tom, Hayes, Patrick E, Henery, Martin, Hochuli, Dieter, Howell, Jocelyn, Huang, Guomin, Hughes, Lesley, Huisman, John, Ilic, Jugoslav, Jagdish, Ashika, Jin, Daniel, Jordan, Gregory, Jurado, Enrique, Kasel, Sabine, Kellermann, Jürgen, Kohout, Michele, Kooyman, Robert M, Kotowska, Martyna M, Lai, Hao Ran, Laliberté, Etienne, Lambers, Hans, Lamont, Byron B, Lanfear, Robert, van Langevelde, Frank, Laughlin, Daniel C, Laugier-Kitchener, Bree-Anne, Lehmann, Caroline ER, Leigh, Andrea, Leishman, Michelle R, Lenz, Tanja, Lepschi, Brendan, Lewis, James D, Lim, Felix, Liu, Udayangani, Lord, Janice, Lusk, Christopher H, Macinnis-Ng, Cate, McPherson, Hannah, Manea, Anthony, Mayfield, Margaret, McCarthy, James K, Meers, Trevor, van der Merwe, Marlien, Metcalfe, Daniel, Milberg, Per, Mokany, Karel, Moles, Angela T ; https://orcid.org/0000-0003-2041-7762, Moore, Ben D, Moore, Nicholas, Morgan, John W, Morris, William, Muir, Annette, Munroe, Samantha, Nicholson, Áine, Nicolle, Dean, Nicotra, Adrienne B, Niinemets, Ülo, North, Tom, O’Reilly-Nugent, Andrew, O’Sullivan, Odhran S, Oberle, Brad, Onoda, Yusuke, Ooi, Mark KJ ; https://orcid.org/0000-0002-3046-0417, Osborne, Colin P, Paczkowska, Grazyna, Pekin, Burak, Pereira, Caio Guilherme, Pickering, Catherine, Pickup, Melinda, Pollock, Laura J, Poot, Pieter, Powell, Jeff R, Power, Sally A, Prentice, Iain Colin, Prior, Lynda, Prober, Suzanne M, Read, Jennifer, Reynolds, Victoria, Richards, Anna E, Richardson, Ben, Roderick, Michael L, Rosell, Julieta A, Rossetto, Maurizio, Rye, Barbara, Rymer, Paul D, Sams, Michael A, Sanson, Gordon, Schmidt, Susanne, Schulze, Ernst-Detlef, Sendall, Kerrie, Sinclair, Steve, Smith, Benjamin, Smith, Renee, Soper, Fiona, Sparrow, Ben, Standish, Rachel, Staples, Timothy L, Taseski, Guy, Thomas, Freya, Tissue, David T, Tjoelker, Mark G, Tng, David Yue Phin, Tomlinson, Kyle, Turner, Neil C, Veneklaas, Erik, Venn, Susanna, Vesk, Peter, Vlasveld, Carolyn, Vorontsova, Maria S, Warren, Charles, Weerasinghe, Lasantha K, Westoby, Mark, White, Matthew, Williams, Nicholas, Wills, Jarrah, Wilson, Peter G, Yates, Colin, Zanne, Amy E, Ziemińska, Kasia, Falster, Daniel ; https://orcid.org/0000-0002-9814-092X, Gallagher, Rachael, Wenk, Elizabeth, Wright, Ian, Indiarto, Dony ; https://orcid.org/0000-0001-9546-8201, Baxter, Caitlan, Andrew, Samuel C, Lawson, James, Allen, Stuart, Fuchs, Anne, Adams, Mark A, Ahrens, Collin W ; https://orcid.org/0000-0002-0614-9928, Alfonzetti, Matthew, Angevin, Tara, Atkin, Owen K, Auld, Tony ; https://orcid.org/0000-0002-8766-2829, Baker, Andrew, Bean, Anthony, Blackman, Chris J, Bloomfield, Keith, Bowman, David, Bragg, Jason ; https://orcid.org/0000-0002-7621-7295, Brodribb, Timothy J, Buckton, Genevieve, Burrows, Geoff, Caldwell, Elizabeth, Camac, James, Carpenter, Raymond, Catford, Jane A, Cawthray, Gregory R, Cernusak, Lucas A, Chandler, Gregory, Chapman, Alex R, Cheal, David, Cheesman, Alexander W, Chen, Si-Chong, Choat, Brendan, Clinton, Brook, Clode, Peta, Coleman, Helen, Cornwell, William K ; https://orcid.org/0000-0003-4080-4073, Cosgrove, Meredith, Crisp, Michael, Cross, Erika, Crous, Kristine Y, Cunningham, Saul, Curtis, Ellen, Daws, Matthew I, DeGabriel, Jane L, Denton, Matthew D, Dong, Ning, Duan, Honglang, Duncan, David H, Duncan, Richard P, Duretto, Marco, Dwyer, John M, Edwards, Cheryl, Esperon-Rodriguez, Manuel, Evans, John R, Everingham, Susan E, Firn, Jennifer, Fonseca, Carlos Roberto, French, Ben J, Frood, Doug, Funk, Jennifer L, Geange, Sonya R, Ghannoum, Oula ; https://orcid.org/0000-0002-1341-0741, Gleason, Sean M, Gosper, Carl R, Gray, Emma, Groom, Philip K, Gross, Caroline, Guerin, Greg, Guja, Lydia, Hahs, Amy K, Harrison, Matthew Tom, Hayes, Patrick E, Henery, Martin, Hochuli, Dieter, Howell, Jocelyn, Huang, Guomin, Hughes, Lesley, Huisman, John, Ilic, Jugoslav, Jagdish, Ashika, Jin, Daniel, Jordan, Gregory, Jurado, Enrique, Kasel, Sabine, Kellermann, Jürgen, Kohout, Michele, Kooyman, Robert M, Kotowska, Martyna M, Lai, Hao Ran, Laliberté, Etienne, Lambers, Hans, Lamont, Byron B, Lanfear, Robert, van Langevelde, Frank, Laughlin, Daniel C, Laugier-Kitchener, Bree-Anne, Lehmann, Caroline ER, Leigh, Andrea, Leishman, Michelle R, Lenz, Tanja, Lepschi, Brendan, Lewis, James D, Lim, Felix, Liu, Udayangani, Lord, Janice, Lusk, Christopher H, Macinnis-Ng, Cate, McPherson, Hannah, Manea, Anthony, Mayfield, Margaret, McCarthy, James K, Meers, Trevor, van der Merwe, Marlien, Metcalfe, Daniel, Milberg, Per, Mokany, Karel, Moles, Angela T ; https://orcid.org/0000-0003-2041-7762, Moore, Ben D, Moore, Nicholas, Morgan, John W, Morris, William, Muir, Annette, Munroe, Samantha, Nicholson, Áine, Nicolle, Dean, Nicotra, Adrienne B, Niinemets, Ülo, North, Tom, O’Reilly-Nugent, Andrew, O’Sullivan, Odhran S, Oberle, Brad, Onoda, Yusuke, Ooi, Mark KJ ; https://orcid.org/0000-0002-3046-0417, Osborne, Colin P, Paczkowska, Grazyna, Pekin, Burak, Pereira, Caio Guilherme, Pickering, Catherine, Pickup, Melinda, Pollock, Laura J, Poot, Pieter, Powell, Jeff R, Power, Sally A, Prentice, Iain Colin, Prior, Lynda, Prober, Suzanne M, Read, Jennifer, Reynolds, Victoria, Richards, Anna E, Richardson, Ben, Roderick, Michael L, Rosell, Julieta A, Rossetto, Maurizio, Rye, Barbara, Rymer, Paul D, Sams, Michael A, Sanson, Gordon, Schmidt, Susanne, Schulze, Ernst-Detlef, Sendall, Kerrie, Sinclair, Steve, Smith, Benjamin, Smith, Renee, Soper, Fiona, Sparrow, Ben, Standish, Rachel, Staples, Timothy L, Taseski, Guy, Thomas, Freya, Tissue, David T, Tjoelker, Mark G, Tng, David Yue Phin, Tomlinson, Kyle, Turner, Neil C, Veneklaas, Erik, Venn, Susanna, Vesk, Peter, Vlasveld, Carolyn, Vorontsova, Maria S, Warren, Charles, Weerasinghe, Lasantha K, Westoby, Mark, White, Matthew, Williams, Nicholas, Wills, Jarrah, Wilson, Peter G, Yates, Colin, Zanne, Amy E, and Ziemińska, Kasia

Abstract

We introduce the AusTraits database - a compilation of measurements of plant traits for taxa in the Australian flora (hereafter AusTraits). AusTraits synthesises data on 375 traits across 29230 taxa from field campaigns, published literature, taxonomic monographs, and individual taxa descriptions. Traits vary in scope from physiological measures of performance (e.g. photosynthetic gas exchange, water-use efficiency) to morphological parameters (e.g. leaf area, seed mass, plant height) which link to aspects of ecological variation. AusTraits contains curated and harmonised individual-, species- and genus-level observations coupled to, where available, contextual information on site properties. This data descriptor provides information on version 2.1.0 of AusTraits which contains data for 937243 trait-by-taxa combinations. We envision AusTraits as an ongoing collaborative initiative for easily archiving and sharing trait data to increase our collective understanding of the Australian flora.

Published
2021

35. Understanding and modelling wildfire regimes: An ecological perspective

Author

Leverhulme Trust, European Commission, Harrison, Sandy P., Prentice, I. Colin, Bloomfield, Keith J., Dong, Ning, Forkel, Matthias, Forrest, Matthew, Ningthoujam, Ramesh K., Pellegrini, Adam F. A., Shen, Yicheng, Baudena, Mara, Cardoso, Anabelle W., Huss, Jessica C., Joshi, Jaideep, Oliveras, Imma, Pausas, J. G., Simpson, Kimberley J., Leverhulme Trust, European Commission, Harrison, Sandy P., Prentice, I. Colin, Bloomfield, Keith J., Dong, Ning, Forkel, Matthias, Forrest, Matthew, Ningthoujam, Ramesh K., Pellegrini, Adam F. A., Shen, Yicheng, Baudena, Mara, Cardoso, Anabelle W., Huss, Jessica C., Joshi, Jaideep, Oliveras, Imma, Pausas, J. G., and Simpson, Kimberley J.

Abstract

Recent extreme wildfire seasons in several regions have been associated with exceptionally hot, dry conditions, made more probable by climate change. Much research has focused on extreme fire weather and its drivers, but natural wildfire regimes—and their interactions with human activities—are far from being comprehensively understood. There is a lack of clarity about the 'causes' of wildfire, and about how ecosystems could be managed for the co-existence of wildfire and people. We present evidence supporting an ecosystem-centred framework for improved understanding and modelling of wildfire. Wildfire has a long geological history and is a pervasive natural process in contemporary plant communities. In some biomes, wildfire would be more frequent without human settlement; in others they would be unchanged or less frequent. A world without fire would have greater forest cover, especially in present-day savannas. Many species would be missing, because fire regimes have co-evolved with plant traits that resist, adapt to or promote wildfire. Certain plant traits are favoured by different fire frequencies, and may be missing in ecosystems that are normally fire-free. For example, post-fire resprouting is more common among woody plants in high-frequency fire regimes than where fire is infrequent. The impact of habitat fragmentation on wildfire crucially depends on whether the ecosystem is fire-adapted. In normally fire-free ecosystems, fragmentation facilitates wildfire starts and is detrimental to biodiversity. In fire-adapted ecosystems, fragmentation inhibits fires from spreading and fire suppression is detrimental to biodiversity. This interpretation explains observed, counterintuitive patterns of spatial correlation between wildfire and potential ignition sources. Lightning correlates positively with burnt area only in open ecosystems with frequent fire. Human population correlates positively with burnt area only in densely forested regions. Models for vegetation-fir

Published
2021

38. AusTraits – a curated plant trait database for the Australian flora

Author

Falster, Daniel, primary, Gallagher, Rachael, additional, Wenk, Elizabeth, additional, Wright, Ian, additional, Indiarto, Dony, additional, Baxter, Caitlan, additional, Andrew, Samuel C., additional, Lawson, James, additional, Allen, Stuart, additional, Fuchs, Anne, additional, Adams, Mark A., additional, Ahrens, Collin W., additional, Alfonzetti, Matthew, additional, Angevin, Tara, additional, Atkin, Owen K., additional, Auld, Tony, additional, Baker, Andrew, additional, Bean, Anthony, additional, Blackman, Chris J., additional, Bloomfield, Keith, additional, Bowman, David, additional, Bragg, Jason, additional, Brodribb, Timothy J., additional, Buckton, Genevieve, additional, Burrows, Geoff, additional, Caldwell, Elizabeth, additional, Camac, James, additional, Carpenter, Raymond, additional, Catford, Jane A., additional, Cawthray, Gregory R., additional, Cernusak, Lucas A., additional, Chandler, Gregory, additional, Chapman, Alex R., additional, Cheal, David, additional, Cheesman, Alexander W., additional, Chen, Si-Chong, additional, Choat, Brendan, additional, Clinton, Brook, additional, Clode, Peta, additional, Coleman, Helen, additional, Cornwell, William K., additional, Cosgrove, Meredith, additional, Crisp, Michael, additional, Cross, Erika, additional, Crous, Kristine Y., additional, Cunningham, Saul, additional, Curtis, Ellen, additional, Daws, Matthew I., additional, DeGabriel, Jane L., additional, Denton, Matthew D., additional, Dong, Ning, additional, Duan, Honglang, additional, Duncan, David H., additional, Duncan, Richard P., additional, Duretto, Marco, additional, Dwyer, John M., additional, Edwards, Cheryl, additional, Esperon-Rodriguez, Manuel, additional, Evans, John R., additional, Everingham, Susan E., additional, Firn, Jennifer, additional, Fonseca, Carlos Roberto, additional, French, Ben J., additional, Frood, Doug, additional, Funk, Jennifer L., additional, Geange, Sonya R., additional, Ghannoum, Oula, additional, Gleason, Sean M., additional, Gosper, Carl R., additional, Gray, Emma, additional, Groom, Philip K., additional, Gross, Caroline, additional, Guerin, Greg, additional, Guja, Lydia, additional, Hahs, Amy K., additional, Harrison, Matthew Tom, additional, Hayes, Patrick E., additional, Henery, Martin, additional, Hochuli, Dieter, additional, Howell, Jocelyn, additional, Huang, Guomin, additional, Hughes, Lesley, additional, Huisman, John, additional, Ilic, Jugoslav, additional, Jagdish, Ashika, additional, Jin, Daniel, additional, Jordan, Gregory, additional, Jurado, Enrique, additional, Kasel, Sabine, additional, Kellermann, Jürgen, additional, Kohout, Michele, additional, Kooyman, Robert M., additional, Kotowska, Martyna M., additional, Lai, Hao Ran, additional, Laliberté, Etienne, additional, Lambers, Hans, additional, Lamont, Byron B., additional, Lanfear, Robert, additional, van Langevelde, Frank, additional, Laughlin, Daniel C., additional, Laugier-Kitchener, Bree-Anne, additional, Lehmann, Caroline E. R., additional, Leigh, Andrea, additional, Leishman, Michelle R., additional, Lenz, Tanja, additional, Lepschi, Brendan, additional, Lewis, James D., additional, Lim, Felix, additional, Liu, Udayangani, additional, Lord, Janice, additional, Lusk, Christopher H., additional, Macinnis-Ng, Cate, additional, McPherson, Hannah, additional, Manea, Anthony, additional, Mayfield, Margaret, additional, McCarthy, James K., additional, Meers, Trevor, additional, van der Merwe, Marlien, additional, Metcalfe, Daniel, additional, Milberg, Per, additional, Mokany, Karel, additional, Moles, Angela T., additional, Moore, Ben D., additional, Moore, Nicholas, additional, Morgan, John W., additional, Morris, William, additional, Muir, Annette, additional, Munroe, Samantha, additional, Nicholson, Áine, additional, Nicolle, Dean, additional, Nicotra, Adrienne B., additional, Niinemets, Ülo, additional, North, Tom, additional, O’Reilly-Nugent, Andrew, additional, O’Sullivan, Odhran S., additional, Oberle, Brad, additional, Onoda, Yusuke, additional, Ooi, Mark K. J., additional, Osborne, Colin P., additional, Paczkowska, Grazyna, additional, Pekin, Burak, additional, Pereira, Caio Guilherme, additional, Pickering, Catherine, additional, Pickup, Melinda, additional, Pollock, Laura J., additional, Poot, Pieter, additional, Powell, Jeff R., additional, Power, Sally A., additional, Prentice, Iain Colin, additional, Prior, Lynda, additional, Prober, Suzanne M., additional, Read, Jennifer, additional, Reynolds, Victoria, additional, Richards, Anna E., additional, Richardson, Ben, additional, Roderick, Michael L., additional, Rosell, Julieta A., additional, Rossetto, Maurizio, additional, Rye, Barbara, additional, Rymer, Paul D., additional, Sams, Michael A., additional, Sanson, Gordon, additional, Schmidt, Susanne, additional, Schulze, Ernst-Detlef, additional, Sendall, Kerrie, additional, Sinclair, Steve, additional, Smith, Benjamin, additional, Smith, Renee, additional, Soper, Fiona, additional, Sparrow, Ben, additional, Standish, Rachel, additional, Staples, Timothy L., additional, Taseski, Guy, additional, Thomas, Freya, additional, Tissue, David T., additional, Tjoelker, Mark G., additional, Tng, David Yue Phin, additional, Tomlinson, Kyle, additional, Turner, Neil C., additional, Veneklaas, Erik, additional, Venn, Susanna, additional, Vesk, Peter, additional, Vlasveld, Carolyn, additional, Vorontsova, Maria S., additional, Warren, Charles, additional, Weerasinghe, Lasantha K., additional, Westoby, Mark, additional, White, Matthew, additional, Williams, Nicholas, additional, Wills, Jarrah, additional, Wilson, Peter G., additional, Yates, Colin, additional, Zanne, Amy E., additional, and Ziemińska, Kasia, additional

Published
2021
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39. Acclimation of leaf respiration temperature responses across thermally contrasting biomes

Author

Zhu, Lingling, primary, Bloomfield, Keith J., additional, Asao, Shinichi, additional, Tjoelker, Mark G., additional, Egerton, John J.G., additional, Hayes, Lucy, additional, Weerasinghe, Lasantha K., additional, Creek, Danielle, additional, Griffin, Kevin L., additional, Hurry, Vaughan, additional, Liddell, Michael, additional, Meir, Patrick, additional, Turnbull, Matthew H., additional, and Atkin, Owen K., additional

Published
2020
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43. Historical changes in the stomatal limitation of photosynthesis: empirical support for an optimality principle

Author

Lavergne, Aliénor, primary, Voelker, Steve, additional, Csank, Adam, additional, Graven, Heather, additional, de Boer, Hugo J., additional, Daux, Valérie, additional, Robertson, Iain, additional, Dorado‐Liñán, Isabel, additional, Martínez‐Sancho, Elisabet, additional, Battipaglia, Giovanna, additional, Bloomfield, Keith J., additional, Still, Christopher J., additional, Meinzer, Frederick C., additional, Dawson, Todd E., additional, Julio Camarero, J., additional, Clisby, Rory, additional, Fang, Yunting, additional, Menzel, Annette, additional, Keen, Rachel M., additional, Roden, John S., additional, and Prentice, I. Colin, additional

Published
2019
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44. The validity of optimal leaf traits modelled on environmental conditions

Author

Bloomfield, Keith, Prentice, I. Colin, Cernusak, Lucas, Eamus, Derek, Medlyn, Belinda E., Rumman, Rizwana, Wright, Ian J., Boer, Matthias M., Cale, Peter, Cleverly, James, Egerton, John (Jack), Ellsworth, David S., Hayes, Lucy, Hutchinson, Michael, Zhu, Lingling, Atkin, Owen, Bloomfield, Keith, Prentice, I. Colin, Cernusak, Lucas, Eamus, Derek, Medlyn, Belinda E., Rumman, Rizwana, Wright, Ian J., Boer, Matthias M., Cale, Peter, Cleverly, James, Egerton, John (Jack), Ellsworth, David S., Hayes, Lucy, Hutchinson, Michael, Zhu, Lingling, and Atkin, Owen

Abstract

The ratio of leaf intercellular to ambient CO2 (chi) is modulated by stomatal conductance (g(s)). These quantities link carbon (C) assimilation with transpiration, and along with photosynthetic capacities (V-cmax and J(max)) are required to model terrestrial C uptake. We use optimization criteria based on the growth environment to generate predicted values of photosynthetic and water-use efficiency traits and test these against a unique dataset.

Published
2019

45. The validity of optimal leaf traits modelled on environmental conditions

Author

Bloomfield, Keith J., primary, Prentice, I. Colin, additional, Cernusak, Lucas A., additional, Eamus, Derek, additional, Medlyn, Belinda E., additional, Rumman, Rizwana, additional, Wright, Ian J., additional, Boer, Matthias M., additional, Cale, Peter, additional, Cleverly, James, additional, Egerton, John J. G., additional, Ellsworth, David S., additional, Evans, Bradley J., additional, Hayes, Lucy S., additional, Hutchinson, Michael F., additional, Liddell, Michael J., additional, Macfarlane, Craig, additional, Meyer, Wayne S., additional, Togashi, Henrique F., additional, Wardlaw, Tim, additional, Zhu, Lingling, additional, and Atkin, Owen K., additional

Published
2018
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48. Functional trait variation related to gap dynamics in tropical moist forests: A vegetation modelling perspective

Author

Togashi, F. Henrique, Atkin, Owen, Bloomfield, Keith, Bradford, Matt, Cao, Kunfang, Dong, Ning, Evans, Bradley, Fan, Zexin, Harrison, S. P., Hua, Zhu, Weerasinghe, Lasantha, Liddell, M. J., Lloyd, Jon, Togashi, F. Henrique, Atkin, Owen, Bloomfield, Keith, Bradford, Matt, Cao, Kunfang, Dong, Ning, Evans, Bradley, Fan, Zexin, Harrison, S. P., Hua, Zhu, Weerasinghe, Lasantha, Liddell, M. J., and Lloyd, Jon

Abstract

The conventional representation of Plant Functional Types (PFTs) in Dynamic Global Vegetation Models (DGVMs) is increasingly recognized as simplistic and lacking in predictive power. Key ecophysiological traits, including photosynthetic parameters, are typically assigned single values for each PFT while the substantial trait variation within PFTs is neglected. This includes continuous variation in response to environmental factors, and differences linked to spatial and temporal niche differentiation within communities. A much stronger empirical basis is required for the treatment of continuous plant functional trait variation in DGVMs. We analyse 431 sets of measurements of leaf and plant traits, including photosynthetic measurements, on evergreen angiosperm trees in tropical moist forests of Australia and China. Confining attention to tropical moist forests, our analysis identifies trait differences that are linked to vegetation dynamic roles. Coordination theory predicts that Rubisco- and electron-transport limited rates of photosynthesis are co-limiting under field conditions. The least-cost hypothesis predicts that air-to-leaf CO2 drawdown minimizes the combined costs per unit carbon assimilation of maintaining carboxylation and transpiration capacities. Aspects of these predictions are supported for within-community trait variation linked to canopy position, just as they are for variation along spatial environmental gradients. Trait differences among plant species occupying different structural and temporal niches may provide a basis for the ecophysiological representation of vegetation dynamics in next-generation DGVMs.

Published
2018

49. Leaf-level photosynthetic capacity in lowland Amazonian and high-1 elevation, Andean tropical moist forests of Peru

Author

Bahar, Nur H. A., Yoko Ishida, F., Weerasinghe, Lasantha K., Guerrieri, Rossella, O'Sullivan, Odhran S., Bloomfield, Keith J., Asner, Gregory P., Martin, Roberta, Lloyd, Jonathan, Malhi, Yadvinder, Phil, Oliver L., Meir, Patrick, Salinas, Norma, Cosio, Eric G., Domingues, Tomas, Quesada, Carlos A., Sinca, Felipe, Escudero Vega, Alberto, Zuloaga Ccorimanya, Paola P., Del Aguila Pasquel, Jhon, Quispe Huaypar, Katherine, Cuba Torres, Israel, Butrón Loayza, Rosalbina, Pelaez Tapia, Yulina, Huaman Ovalle, Judit, Long, Benedict M., Evans, John R., and Atkin, Owen K.

Subjects
Carboxylation capacity, Nitrogen, Tropical forests, Elevation, Leaf traits, Temperature, Phosphorus, Ribulose bisphosphate regeneration
Abstract

We examined whether variations in photosynthetic capacity are linked to variations in the environment and/or associated leaf traits for tropical moist forests (TMFs) in the Andes/western Amazon regions of Peru. We compared photosynthetic capacity (maximal rate of carboxylation of Rubisco (Vcmax), and the maximum rate of electron transport (Jmax)), leaf mass, nitrogen (N) and phosphorus (P) per unit leaf area (Ma, Na and Pa, respectively), and chlorophyll from 210 species at 18 field sites along a 3300-m elevation gradient. Western blots were used to quantify the abundance of the CO2-fixing enzyme Rubisco. Area- and N-based rates of photosynthetic capacity at 25°C were higher in upland than lowland TMFs, underpinned by greater investment of N in photosynthesis in high-elevation trees. Soil [P] and leaf Pa were key explanatory factors for models of area-based Vcmax and Jmax but did not account for variations in photosynthetic N-use efficiency. At any given Na and Pa, the fraction of N allocated to photosynthesis was higher in upland than lowland species. For a small subset of lowland TMF trees examined, a substantial fraction of Rubisco was inactive. These results highlight the importance of soil- and leaf-P in defining the photosynthetic capacity of TMFs, with variations in N allocation and Rubisco activation state further influencing photosynthetic rates and N-use efficiency of these critically important forests.

Published
2017

50. Leaf-level photosynthetic capacity in lowland Amazonian and high-elevation Andean tropical moist forests of Peru

Author

Bahar, Nur H. A., Ishida, Françoise Yoko, Weerasinghe, Lasantha K., Guerrieri, Rossella, O'Sullivan, Odhran S., Bloomfield, Keith J., Asner, Gregory P., Martin, Roberta E., Lloyd, Jon, Malhi, Yadvinder, Phillips, Oliver L., Meir, Patrick, Salinas, Norma, Cosio, Eric G., Domingues, Tomas F., Quesada, Carlos A., Sinca, Felipe, Escudero Vega, Alberto, Zuloaga Ccorimanya, Paola P., del Águila Pasquel, Jhon, Quispe Huaypar, Katherine, Cuba Torres, Israel, Butrón Loayza, Rosalbina, Pelaez Tapia, Yulina, Huaman Ovalle, Judit, Long, Benedict M., Evans, John R., and Atkin, Owen K.

Subjects
Ciclo de Calvin, Rubisco, Bosque tropical húmedo, Fotosíntesis, Hojas, Nitrógeno, Liasas, Amazonía, Carboxi-liasas, Andes, Respiración celular
Abstract

Analiza si las variaciones en la capacidad fotosintética están vinculadas a las variaciones en el medio ambiente y/o a los rasgos foliares asociados para los bosques húmedos tropicales (BHT) en las regiones de los Andes/Amazonía occidental de Perú. Comparamos la capacidad fotosintética (tasa máxima de carboxilación de la enzima Rubisco (Vcmax), y la tasa máxima de transporte de electrones Jmax), la masa foliar, el nitrógeno (N) y el fósforo (P) por unidad de área foliar (Ma, Na y Pa, respectivamente), y la clorofila de 210 especies en 18 sitios de campo a lo largo de un gradiente de elevación de 3300 m. Se utilizaron Western blots para cuantificar la abundancia de la enzima fijadora de CO2 Rubisco. Las tasas de capacidad fotosintética basadas en el área y en el N a 25°C fueron más altas en las TMF de las tierras altas que en las de las tierras bajas, respaldadas por una mayor inversión de N en la fotosíntesis en los árboles de gran altitud. El (P) del suelo y la Pa de la hoja fueron factores explicativos clave para los modelos de Vcmax y Jmax basados en el área, pero no explicaron las variaciones en la eficiencia del uso del N fotosintético. En cualquier caso de Na y Pa, la fracción de N asignada a la fotosíntesis fue mayor en las especies de tierras altas que en las de tierras bajas. Para un pequeño subconjunto de árboles TMF de tierras bajas examinados, una fracción sustancial de la enzima Rubisco estaba inactiva. Estos resultados ponen de manifiesto la importancia de la P del suelo y de la hoja en la definición de la capacidad fotosintética de los BHT, con variaciones en la asignación de N y en el estado de activación de la Rubisco que influyen en las tasas fotosintéticas y en la eficiencia del uso del N de estos bosques de importancia crítica. Revisado por pares.

Published
2016

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