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55. A submerged pine forest from the early Holocene in the Mecklenburg Lake District, northern Germany

Author

Kaiser, Knut, primary, Oldorff, Silke, additional, Breitbach, Carsten, additional, Kappler, Christoph, additional, Theuerkauf, Martin, additional, Scharnweber, Tobias, additional, Schult, Manuela, additional, Küster, Mathias, additional, Engelhardt, Christof, additional, Heinrich, Ingo, additional, Hupfer, Michael, additional, Schwalbe, Grit, additional, Kirschey, Tom, additional, and Bens, Oliver, additional

Published
2018
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57. An 810-year history of cold season temperature variability for northern Poland

Author

Balanzategui, Daniel, primary, Knorr, Antje, additional, Heussner, Karl-Uwe, additional, Wazny, Tomasz, additional, Beck, Wolfgang, additional, Słowiński, Michał, additional, Helle, Gerhard, additional, Buras, Allan, additional, Wilmking, Martin, additional, Van Der Maaten, Ernst, additional, Scharnweber, Tobias, additional, Dorado-Liñán, Isabel, additional, and Heinrich, Ingo, additional

Published
2017
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59. An 810‐year history of cold season temperature variability for northern Poland.

Author

Balanzategui, Daniel, Knorr, Antje, Heussner, Karl‐Uwe, Wazny, Tomasz, Beck, Wolfgang, Słowiński, Michał, Helle, Gerhard, Buras, Allan, Wilmking, Martin, Van Der Maaten, Ernst, Scharnweber, Tobias, Dorado‐Liñán, Isabel, and Heinrich, Ingo

Subjects
SCOTS pine, PHYTOGEOGRAPHY, EFFECT of temperature on plants, PLANT growth, PLANT ecophysiology
Abstract

Scots pine (Pinus sylvestris L.) is a widely used tree species in European dendroclimatology studies due to its common distribution across much of the continent. Almost all studies find radial growth strongly related to summer temperature, a result reflecting site selection at high elevation/latitude environments where trees grow at their ecophysiological limits. Due to the amount of attention spent on these sites there is a geographical and seasonal bias in temperature reconstructions based upon tree‐ring proxies in Europe. To overcome the limited availability of tree‐ring data in temperate lowlands, we present a northern Poland ring‐width chronology developed from living and historic Scots pine material with a strong common growth signal going back to AD 1200. Investigations into climate‐growth relationships found year‐to‐year ring‐width variability to be more strongly correlated to cold season temperature (November to April) prior to the growing season than summer temperatures during tree‐ring formation. Based on this relationship it was possible to reconstruct cold season temperature conditions for the last 810 years. Spatial field correlations with gridded instrumental records indicated that the reconstruction provides relevant cold season temperature information across the land regions bordering the North Atlantic Ocean and Baltic Sea, lowlands and uplands of western and central Europe, and the eastern and central interior of Russia. Despite an unsuccessful attempt to find a stationary relationship with the North Atlantic Oscillation, comparisons with several cold season temperature reconstructions confirmed the long‐term connection between our reconstructed temperature series for northern Poland and the wider area. [ABSTRACT FROM AUTHOR]

Published
2018
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61. Ein dendroökologischer Vergleich zur Wirkung der Stickstoffverfügbarkeit auf das Dickenwachstum von Bergahorn und Rotbuche

Author

Scharnweber, Tobias, Wilmking, Martin, Universität Greifswald, Brisch, Andreas, Scharnweber, Tobias, Wilmking, Martin, Universität Greifswald, and Brisch, Andreas

Abstract

In der vorliegenden Arbeit wurde das Wachstum von Bergahorn und Buche mit dendroökologischen Methoden untersucht. Dies geschah vor dem Hintergrund der Ausbreitung des Bergahorns und der Eutrophierung der Landschaft. Die daran anknüpfende Fragestellung ist: Begünstigt Eutrophierung den Bergahorn? Die Untersuchung fand in einem Waldstück in Mecklenburg-Vorpommern statt. Dabei wurden von 42 Bergahornen und 38 Buchen Bohrkerne für die Vermessung der Jahrringe genommen. Weiterhin wurde neben jedem beprobten Baum das C/N-Verhältnis des Oberbodens bestimmt (n=80). Die Auswertung der Daten erfolgte durch drei Ansätze: 1.) Der Einfluss einer Hähnchenmastanlage auf beide Baumarten wurde untersucht. 2.) Die Beziehung zwischen dem C/N-Verhältnis des Bodens und dem Wachstum der Bäume wurde verglichen. 3.) Auf unterschiedlichen Standorten (C/N-Verhältnis) wurde die Abhängigkeit des Wachstums der Bäume vom Klima untersucht. Dabei wurde die Reaktion der beiden Arten auf das Klima verglichen. Die deutlichsten Ergebnisse wurden durch den zweiten Ansatz erzielt. Das C/N-Verhältnis des oberen Bodens lag zwischen 12,4 und 17,4. In diesem Bereich wurde eine positive Korrelation zwischen dem C/N-Verhältnis des Bodens und dem Wachstum der Bäume festgestellt. Die Ergebnisse deuten auf eine Schädigung der beiden Arten durch Stickstoff hin, welche beim Bergahorn (R² = 0,30) stärker als bei der Buche (R² = 0,18) ausgeprägt ist. Daraus folgt, dass der Bergahorn durch die Eutrophierung geschwächt wird. Ein Einfluss der Mastanlage auf das Wachstum der Bäume wurde nicht festgestellt. Auf das Klima reagierten beiden Arten ähnlich. Es bestand ein positiver Zusammenhang zwischen dem Niederschlag und dem Wachstum der Bäume. Der Einfluss des Standorts auf die Klimareaktion der Bäume war uneindeutig., Within this thesis the growth of sycamore (Acer pseudoplatanus L.) and beech (Fagus sylvatica L.) was investigated by applying dendroecological methods. The overall idea derived from the distribution of sycamore and the eutrophication of the environment leading to the question whether eutrophication promotes the spread of sycamore. The investigated forest was located in Mecklenburg-Vorpommern. To inspect the annual rings of the trees 42 samples were taken off the trunk of sycamore while 38 samples were gathered from beech. Apart from that the ratio of carbon and nitrogen within the topsoil of every single tree was analysed (n=80). The evaluation of the data employed three approaches. 1.) The impact of a poultry farm on both species was investigated. 2.) The relation of the C/N-ratio of the soil was compared to the growth of the trees. 3.) The connection between the growth of the trees and the climate was examined for the various sites (in terms of the C/N-ratio). Thereby the response of the species onto the climate was compared. The most precise results were achieved within the second approach. Values for the C/N-ratio of the upper soil lay between 12.4 and 17.4. A positive correlation between the C/N-ratio of the soil and the growth of the trees was discovered within this range. The results suggest an adverse effect to both of the species. This effect is more intense regarding sycamore (R² = 0,30) compared to beech (R² = 0,18). It can therefore be concluded that sycamore is weakened by eutrophication. An effect of the poultry farm on the species was not observed. Both species responded similarly regarding climate parameters. A positive relation between precipitation and growth of the trees was found. The impact of the location on the climate reaction of the trees was ambiguous.

Published
2014

63. Impact of climate change on tree-ring growth of Scots pine, common beech and pedunculate oak in northeastern Germany.

Author

Bauwe, Andreas, Jurasinski, Gerald, Scharnweber, Tobias, Schröder, Christian, and Lennartz, Bernd

Subjects
TREE-rings, EUROPEAN beech, ENGLISH oak, SCOTS pine, TREE growth, FOREST ecology, VEGETATION & climate, SOIL-Water Balance Model
Abstract

Tree growth depends, among other factors, largely on the prevailing climatic conditions. Therefore, changes to tree growth patterns are to be expected under climate change. Here, we analyze the tree-ring growth response of three major European tree species to projected future climate across a climatic (mostly precipitation) gradient in northeastern Germany. We used monthly data for temperature, precipitation, and the standardized precipitation evapotranspiration index (SPEI) over multiple time scales (1, 3, 6, 12, and 24 months) to construct models of tree-ring growth for Scots pine (Pinus sylvestris L.) at three pure stands, and for common beech (Fagus sylvatica L.) and pedunculate oak (Quercus robur L.) at three mature mixed stands. The regression models were derived using a two-step approach based on partial least squares regression (PLSR) to extract potentially well explaining variables followed by ordinary least squares regression (OLSR) to consolidate the models to the least number of variables while retaining high explanatory power. The stability of the models was tested through a comprehensive calibration-verification scheme. All models were successfully verified with R?s ranging from 0.21 for the western pine stand to 0.62 for the beech stand in the east. For growth prediction, climate data forecasted until 2100 by the regional climate model WETTREG2010 based on the A1B Intergovernmental Panel on Climate Change (IPCC) emission scenario was used. For beech and oak, growth rates will likely decrease until the end of the 21st century. For pine, modeled growth trends vary and range from a slight growth increase to a weak decrease in growth rates. The climatic gradient across the study area will possibly affect the future growth of oak with larger growth reductions towards the drier east. For beech, site-specific adaptations seem to override the influence of the climatic gradient. We conclude that Scots pine has great potential to remain resilient to projected climate change without any greater impairment, whereas common beech and pedunculate oak will likely face lesser growth under the expected warmer and dryer climate conditions. The results call for an adaptation of forest management to mitigate the negative effects of climate change for beech and oak. [ABSTRACT FROM AUTHOR]

Published
2016
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65. Upscaling biodiversity monitoring: Metabarcoding estimates 31,846 insect species from Malaise traps across Germany.

Author

Buchner, Dominik, Sinclair, James S., Ayasse, Manfred, Beermann, Arne J., Buse, Jörn, Dziock, Frank, Enss, Julian, Frenzel, Mark, Hörren, Thomas, Li, Yuanheng, Monaghan, Michael T., Morkel, Carsten, Müller, Jörg, Pauls, Steffen U., Richter, Ronny, Scharnweber, Tobias, Sorg, Martin, Stoll, Stefan, Twietmeyer, Sönke, and Weisser, Wolfgang W.

Subjects
*BIODIVERSITY monitoring, *INSECT diversity, *NUMBERS of species, *SPECIES diversity, *JUDGMENT (Psychology)
Abstract

Mitigating ongoing losses of insects and their key functions (e.g. pollination) requires tracking large‐scale and long‐term community changes. However, doing so has been hindered by the high diversity of insect species that requires prohibitively high investments of time, funding and taxonomic expertise when addressed with conventional tools. Here, we show that these concerns can be addressed through a comprehensive, scalable and cost‐efficient DNA metabarcoding workflow. We use 1815 samples from 75 Malaise traps across Germany from 2019 and 2020 to demonstrate how metabarcoding can be incorporated into large‐scale insect monitoring networks for less than 50 € per sample, including supplies, labour and maintenance. We validated the detected species using two publicly available databases (GBOL and GBIF) and the judgement of taxonomic experts. With an average of 1.4 M sequence reads per sample we uncovered 10,803 validated insect species, of which 83.9% were represented by a single Operational Taxonomic Unit (OTU). We estimated another 21,043 plausible species, which we argue either lack a reference barcode or are undescribed. The total of 31,846 species is similar to the number of insect species known for Germany (~35,500). Because Malaise traps capture only a subset of insects, our approach identified many species likely unknown from Germany or new to science. Our reproducible workflow (~80% OTU‐similarity among years) provides a blueprint for large‐scale biodiversity monitoring of insects and other biodiversity components in near real time. [ABSTRACT FROM AUTHOR]

Published
2024
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66. Climatically controlled reproduction drives interannual growth variability in a temperate tree species

Author

Hacket-Pain, Andrew J, Ascoli, Davide, Vacchiano, Giorgio, Biondi, Franco, Cavin, Liam, Conedera, Marco, Drobyshev, Igor, Liñán, Isabel Dorado, Friend, Andrew D, Grabner, Michael, Hartl, Claudia, Kreyling, Juergen, Lebourgeois, François, Levanič, Tom, Menzel, Annette, Van Der Maaten, Ernst, Van Der Maaten-Theunissen, Marieke, Muffler, Lena, Motta, Renzo, Roibu, Catalin-Constantin, Popa, Ionel, Scharnweber, Tobias, Weigel, Robert, Wilmking, Martin, and Zang, Christian S

Subjects
Dendrochronology, Fagus sylvatica, Climate Change, Reproduction, drought, 15. Life on land, structural equation modelling, Forests, masting, European beech, Trees, 13. Climate action, SEM, forest growth, Fagus, path analysis, FOS: Medical biotechnology, trade-off
Abstract

Climatically controlled allocation to reproduction is a key mechanism by which climate influences tree growth and may explain lagged correlations between climate and growth. We used continent-wide datasets of tree-ring chronologies and annual reproductive effort in Fagus sylvatica from 1901 to 2015 to characterise relationships between climate, reproduction and growth. Results highlight that variable allocation to reproduction is a key factor for growth in this species, and that high reproductive effort ('mast years') is associated with stem growth reduction. Additionally, high reproductive effort is associated with previous summer temperature, creating lagged climate effects on growth. Consequently, understanding growth variability in forest ecosystems requires the incorporation of reproduction, which can be highly variable. Our results suggest that future response of growth dynamics to climate change in this species will be strongly influenced by the response of reproduction.

67. Global maps of soil temperature

Author

Lembrechts, Jonas J, Van Den Hoogen, Johan, Aalto, Juha, Ashcroft, Michael B, De Frenne, Pieter, Kemppinen, Julia, Kopecký, Martin, Luoto, Miska, Maclean, Ilya MD, Crowther, Thomas W, Bailey, Joseph J, Haesen, Stef, Klinges, David H, Niittynen, Pekka, Scheffers, Brett R, Van Meerbeek, Koenraad, Aartsma, Peter, Abdalaze, Otar, Abedi, Mehdi, Aerts, Rien, Ahmadian, Negar, Ahrends, Antje, Alatalo, Juha M, Alexander, Jake M, Allonsius, Camille Nina, Altman, Jan, Ammann, Christof, Andres, Christian, Andrews, Christopher, Ardö, Jonas, Arriga, Nicola, Arzac, Alberto, Aschero, Valeria, Assis, Rafael L, Assmann, Jakob Johann, Bader, Maaike Y, Bahalkeh, Khadijeh, Barančok, Peter, Barrio, Isabel C, Barros, Agustina, Barthel, Matti, Basham, Edmund W, Bauters, Marijn, Bazzichetto, Manuele, Marchesini, Luca Belelli, Bell, Michael C, Benavides, Juan C, Benito Alonso, José Luis, Berauer, Bernd J, Bjerke, Jarle W, Björk, Robert G, Björkman, Mats P, Björnsdóttir, Katrin, Blonder, Benjamin, Boeckx, Pascal, Boike, Julia, Bokhorst, Stef, Brum, Bárbara NS, Brůna, Josef, Buchmann, Nina, Buysse, Pauline, Camargo, José Luís, Campoe, Otávio C, Candan, Onur, Canessa, Rafaella, Cannone, Nicoletta, Carbognani, Michele, Carnicer, Jofre, Casanova-Katny, Angélica, Cesarz, Simone, Chojnicki, Bogdan, Choler, Philippe, Chown, Steven L, Cifuentes, Edgar F, Čiliak, Marek, Contador, Tamara, Convey, Peter, Cooper, Elisabeth J, Cremonese, Edoardo, Curasi, Salvatore R, Curtis, Robin, Cutini, Maurizio, Dahlberg, C Johan, Daskalova, Gergana N, De Pablo, Miguel Angel, Della Chiesa, Stefano, Dengler, Jürgen, Deronde, Bart, Descombes, Patrice, Di Cecco, Valter, Di Musciano, Michele, Dick, Jan, Dimarco, Romina D, Dolezal, Jiri, Dorrepaal, Ellen, Dušek, Jiří, Eisenhauer, Nico, Eklundh, Lars, Erickson, Todd E, Erschbamer, Brigitta, Eugster, Werner, Ewers, Robert M, Exton, Dan A, Fanin, Nicolas, Fazlioglu, Fatih, Feigenwinter, Iris, Fenu, Giuseppe, Ferlian, Olga, Fernández Calzado, M Rosa, Fernández-Pascual, Eduardo, Finckh, Manfred, Higgens, Rebecca Finger, Forte, T'ai GW, Freeman, Erika C, Frei, Esther R, Fuentes-Lillo, Eduardo, García, Rafael A, García, María B, Géron, Charly, Gharun, Mana, Ghosn, Dany, Gigauri, Khatuna, Gobin, Anne, Goded, Ignacio, Goeckede, Mathias, Gottschall, Felix, Goulding, Keith, Govaert, Sanne, Graae, Bente Jessen, Greenwood, Sarah, Greiser, Caroline, Grelle, Achim, Guénard, Benoit, Guglielmin, Mauro, Guillemot, Joannès, Haase, Peter, Haider, Sylvia, Halbritter, Aud H, Hamid, Maroof, Hammerle, Albin, Hampe, Arndt, Haugum, Siri V, Hederová, Lucia, Heinesch, Bernard, Helfter, Carole, Hepenstrick, Daniel, Herberich, Maximiliane, Herbst, Mathias, Hermanutz, Luise, Hik, David S, Hoffrén, Raúl, Homeier, Jürgen, Hörtnagl, Lukas, Høye, Toke T, Hrbacek, Filip, Hylander, Kristoffer, Iwata, Hiroki, Jackowicz-Korczynski, Marcin Antoni, Jactel, Hervé, Järveoja, Järvi, Jastrzębowski, Szymon, Jentsch, Anke, Jiménez, Juan J, Jónsdóttir, Ingibjörg S, Jucker, Tommaso, Jump, Alistair S, Juszczak, Radoslaw, Kanka, Róbert, Kašpar, Vít, Kazakis, George, Kelly, Julia, Khuroo, Anzar A, Klemedtsson, Leif, Klisz, Marcin, Kljun, Natascha, Knohl, Alexander, Kobler, Johannes, Kollár, Jozef, Kotowska, Martyna M, Kovács, Bence, Kreyling, Juergen, Lamprecht, Andrea, Lang, Simone I, Larson, Christian, Larson, Keith, Laska, Kamil, Le Maire, Guerric, Leihy, Rachel I, Lens, Luc, Liljebladh, Bengt, Lohila, Annalea, Lorite, Juan, Loubet, Benjamin, Lynn, Joshua, Macek, Martin, Mackenzie, Roy, Magliulo, Enzo, Maier, Regine, Malfasi, Francesco, Máliš, František, Man, Matěj, Manca, Giovanni, Manco, Antonio, Manise, Tanguy, Manolaki, Paraskevi, Marciniak, Felipe, Matula, Radim, Mazzolari, Ana Clara, Medinets, Sergiy, Medinets, Volodymyr, Meeussen, Camille, Merinero, Sonia, Mesquita, Rita De Cássia Guimarães, Meusburger, Katrin, Meysman, Filip, Michaletz, Sean T, Milbau, Ann, Moiseev, Dmitry, Moiseev, Pavel, Mondoni, Andrea, Monfries, Ruth, Montagnani, Leonardo, Moriana-Armendariz, Mikel, Morra Di Cella, Umberto, Mörsdorf, Martin, Mosedale, Jonathan R, Muffler, Lena, Muñoz-Rojas, Miriam, Myers, Jonathan A, Myers-Smith, Isla H, Nagy, Laszlo, Nardino, Marianna, Naujokaitis-Lewis, Ilona, Newling, Emily, Nicklas, Lena, Niedrist, Georg, Niessner, Armin, Nilsson, Mats B, Normand, Signe, Nosetto, Marcelo D, Nouvellon, Yann, Nuñez, Martin A, Ogaya, Romà, Ogée, Jérôme, Okello, Joseph, Olejnik, Janusz, Olesen, Jørgen Eivind, Opedal, Øystein H, Orsenigo, Simone, Palaj, Andrej, Pampuch, Timo, Panov, Alexey V, Pärtel, Meelis, Pastor, Ada, Pauchard, Aníbal, Pauli, Harald, Pavelka, Marian, Pearse, William D, Peichl, Matthias, Pellissier, Loïc, Penczykowski, Rachel M, Penuelas, Josep, Petit Bon, Matteo, Petraglia, Alessandro, Phartyal, Shyam S, Phoenix, Gareth K, Pio, Casimiro, Pitacco, Andrea, Pitteloud, Camille, Plichta, Roman, Porro, Francesco, Portillo-Estrada, Miguel, Poulenard, Jérôme, Poyatos, Rafael, Prokushkin, Anatoly S, Puchalka, Radoslaw, Pușcaș, Mihai, Radujković, Dajana, Randall, Krystal, Ratier Backes, Amanda, Remmele, Sabine, Remmers, Wolfram, Renault, David, Risch, Anita C, Rixen, Christian, Robinson, Sharon A, Robroek, Bjorn JM, Rocha, Adrian V, Rossi, Christian, Rossi, Graziano, Roupsard, Olivier, Rubtsov, Alexey V, Saccone, Patrick, Sagot, Clotilde, Sallo Bravo, Jhonatan, Santos, Cinthya C, Sarneel, Judith M, Scharnweber, Tobias, Schmeddes, Jonas, Schmidt, Marius, Scholten, Thomas, Schuchardt, Max, Schwartz, Naomi, Scott, Tony, Seeber, Julia, Segalin De Andrade, Ana Cristina, Seipel, Tim, Semenchuk, Philipp, Senior, Rebecca A, Serra-Diaz, Josep M, Sewerniak, Piotr, Shekhar, Ankit, Sidenko, Nikita V, Siebicke, Lukas, Siegwart Collier, Laura, Simpson, Elizabeth, Siqueira, David P, Sitková, Zuzana, Six, Johan, Smiljanic, Marko, Smith, Stuart W, Smith-Tripp, Sarah, Somers, Ben, Sørensen, Mia Vedel, Souza, José João LL, Souza, Bartolomeu Israel, Souza Dias, Arildo, Spasojevic, Marko J, Speed, James DM, Spicher, Fabien, Stanisci, Angela, Steinbauer, Klaus, Steinbrecher, Rainer, Steinwandter, Michael, Stemkovski, Michael, Stephan, Jörg G, Stiegler, Christian, Stoll, Stefan, Svátek, Martin, Svoboda, Miroslav, Tagesson, Torbern, Tanentzap, Andrew J, Tanneberger, Franziska, Theurillat, Jean-Paul, Thomas, Haydn JD, Thomas, Andrew D, Tielbörger, Katja, Tomaselli, Marcello, Treier, Urs Albert, Trouillier, Mario, Turtureanu, Pavel Dan, Tutton, Rosamond, Tyystjärvi, Vilna A, Ueyama, Masahito, Ujházy, Karol, Ujházyová, Mariana, Uogintas, Domas, Urban, Anastasiya V, Urban, Josef, Urbaniak, Marek, Ursu, Tudor-Mihai, Vaccari, Francesco Primo, Van De Vondel, Stijn, Van Den Brink, Liesbeth, Van Geel, Maarten, Vandvik, Vigdis, Vangansbeke, Pieter, Varlagin, Andrej, Veen, GF, Veenendaal, Elmar, Venn, Susanna E, Verbeeck, Hans, Verbrugggen, Erik, Verheijen, Frank GA, Villar, Luis, Vitale, Luca, Vittoz, Pascal, Vives-Ingla, Maria, Von Oppen, Jonathan, Walz, Josefine, Wang, Runxi, Wang, Yifeng, Way, Robert G, Wedegärtner, Ronja EM, Weigel, Robert, Wild, Jan, Wilkinson, Matthew, Wilmking, Martin, Wingate, Lisa, Winkler, Manuela, Wipf, Sonja, Wohlfahrt, Georg, Xenakis, Georgios, Yang, Yan, Yu, Zicheng, Yu, Kailiang, Zellweger, Florian, Zhang, Jian, Zhang, Zhaochen, Zhao, Peng, Ziemblińska, Klaudia, Zimmermann, Reiner, Zong, Shengwei, Zyryanov, Viacheslav I, Nijs, Ivan, and Lenoir, Jonathan

Subjects
soil temperature, Climate Change, Temperature, soil-dwelling organisms, Microclimate, 15. Life on land, weather stations, near-surface temperatures, Soil, bioclimatic variables, 13. Climate action, temperature offset, global maps, Ecosystem
Abstract

Research in global change ecology relies heavily on global climatic grids derived from estimates of air temperature in open areas at around 2 m above the ground. These climatic grids do not reflect conditions below vegetation canopies and near the ground surface, where critical ecosystem functions occur and most terrestrial species reside. Here, we provide global maps of soil temperature and bioclimatic variables at a 1-km2 resolution for 0-5 and 5-15 cm soil depth. These maps were created by calculating the difference (i.e. offset) between in situ soil temperature measurements, based on time series from over 1200 1-km2 pixels (summarized from 8519 unique temperature sensors) across all the world's major terrestrial biomes, and coarse-grained air temperature estimates from ERA5-Land (an atmospheric reanalysis by the European Centre for Medium-Range Weather Forecasts). We show that mean annual soil temperature differs markedly from the corresponding gridded air temperature, by up to 10°C (mean = 3.0 ± 2.1°C), with substantial variation across biomes and seasons. Over the year, soils in cold and/or dry biomes are substantially warmer (+3.6 ± 2.3°C) than gridded air temperature, whereas soils in warm and humid environments are on average slightly cooler (-0.7 ± 2.3°C). The observed substantial and biome-specific offsets emphasize that the projected impacts of climate and climate change on near-surface biodiversity and ecosystem functioning are inaccurately assessed when air rather than soil temperature is used, especially in cold environments. The global soil-related bioclimatic variables provided here are an important step forward for any application in ecology and related disciplines. Nevertheless, we highlight the need to fill remaining geographic gaps by collecting more in situ measurements of microclimate conditions to further enhance the spatiotemporal resolution of global soil temperature products for ecological applications.

68. Ein dendroökologischer Vergleich zur Wirkung der Stickstoffverfügbarkeit auf das Dickenwachstum von Bergahorn und Rotbuche

Author

Brisch, Andreas, Scharnweber, Tobias, Wilmking, Martin, and Universität Greifswald

Subjects
Klimareaktion, Fagus, Acer, Mastanlage, Eutrophierung, C/N-Verhältnis, ddc:634, nitrogen, eutrophication, dendroecology, dendro, ecology, climate growth relation, Fagus, Acer, c/n-ratio
Abstract

In der vorliegenden Arbeit wurde das Wachstum von Bergahorn und Buche mit dendroökologischen Methoden untersucht. Dies geschah vor dem Hintergrund der Ausbreitung des Bergahorns und der Eutrophierung der Landschaft. Die daran anknüpfende Fragestellung ist: Begünstigt Eutrophierung den Bergahorn? Die Untersuchung fand in einem Waldstück in Mecklenburg-Vorpommern statt. Dabei wurden von 42 Bergahornen und 38 Buchen Bohrkerne für die Vermessung der Jahrringe genommen. Weiterhin wurde neben jedem beprobten Baum das C/N-Verhältnis des Oberbodens bestimmt (n=80). Die Auswertung der Daten erfolgte durch drei Ansätze: 1.) Der Einfluss einer Hähnchenmastanlage auf beide Baumarten wurde untersucht. 2.) Die Beziehung zwischen dem C/N-Verhältnis des Bodens und dem Wachstum der Bäume wurde verglichen. 3.) Auf unterschiedlichen Standorten (C/N-Verhältnis) wurde die Abhängigkeit des Wachstums der Bäume vom Klima untersucht. Dabei wurde die Reaktion der beiden Arten auf das Klima verglichen. Die deutlichsten Ergebnisse wurden durch den zweiten Ansatz erzielt. Das C/N-Verhältnis des oberen Bodens lag zwischen 12,4 und 17,4. In diesem Bereich wurde eine positive Korrelation zwischen dem C/N-Verhältnis des Bodens und dem Wachstum der Bäume festgestellt. Die Ergebnisse deuten auf eine Schädigung der beiden Arten durch Stickstoff hin, welche beim Bergahorn (R² = 0,30) stärker als bei der Buche (R² = 0,18) ausgeprägt ist. Daraus folgt, dass der Bergahorn durch die Eutrophierung geschwächt wird. Ein Einfluss der Mastanlage auf das Wachstum der Bäume wurde nicht festgestellt. Auf das Klima reagierten beiden Arten ähnlich. Es bestand ein positiver Zusammenhang zwischen dem Niederschlag und dem Wachstum der Bäume. Der Einfluss des Standorts auf die Klimareaktion der Bäume war uneindeutig. Within this thesis the growth of sycamore (Acer pseudoplatanus L.) and beech (Fagus sylvatica L.) was investigated by applying dendroecological methods. The overall idea derived from the distribution of sycamore and the eutrophication of the environment leading to the question whether eutrophication promotes the spread of sycamore. The investigated forest was located in Mecklenburg-Vorpommern. To inspect the annual rings of the trees 42 samples were taken off the trunk of sycamore while 38 samples were gathered from beech. Apart from that the ratio of carbon and nitrogen within the topsoil of every single tree was analysed (n=80). The evaluation of the data employed three approaches. 1.) The impact of a poultry farm on both species was investigated. 2.) The relation of the C/N-ratio of the soil was compared to the growth of the trees. 3.) The connection between the growth of the trees and the climate was examined for the various sites (in terms of the C/N-ratio). Thereby the response of the species onto the climate was compared. The most precise results were achieved within the second approach. Values for the C/N-ratio of the upper soil lay between 12.4 and 17.4. A positive correlation between the C/N-ratio of the soil and the growth of the trees was discovered within this range. The results suggest an adverse effect to both of the species. This effect is more intense regarding sycamore (R² = 0,30) compared to beech (R² = 0,18). It can therefore be concluded that sycamore is weakened by eutrophication. An effect of the poultry farm on the species was not observed. Both species responded similarly regarding climate parameters. A positive relation between precipitation and growth of the trees was found. The impact of the location on the climate reaction of the trees was ambiguous.

Published
2014

69. Climatically controlled reproduction drives interannual growth variability in a temperate tree species.

Author

Hacket-Pain AJ, Ascoli D, Vacchiano G, Biondi F, Cavin L, Conedera M, Drobyshev I, Liñán ID, Friend AD, Grabner M, Hartl C, Kreyling J, Lebourgeois F, Levanič T, Menzel A, van der Maaten E, van der Maaten-Theunissen M, Muffler L, Motta R, Roibu CC, Popa I, Scharnweber T, Weigel R, Wilmking M, and Zang CS

Subjects
Climate Change, Forests, Reproduction, Fagus, Trees growth & development
Abstract

Climatically controlled allocation to reproduction is a key mechanism by which climate influences tree growth and may explain lagged correlations between climate and growth. We used continent-wide datasets of tree-ring chronologies and annual reproductive effort in Fagus sylvatica from 1901 to 2015 to characterise relationships between climate, reproduction and growth. Results highlight that variable allocation to reproduction is a key factor for growth in this species, and that high reproductive effort ('mast years') is associated with stem growth reduction. Additionally, high reproductive effort is associated with previous summer temperature, creating lagged climate effects on growth. Consequently, understanding growth variability in forest ecosystems requires the incorporation of reproduction, which can be highly variable. Our results suggest that future response of growth dynamics to climate change in this species will be strongly influenced by the response of reproduction., (© 2018 The Authors Ecology Letters published by CNRS and John Wiley & Sons Ltd.)

Published
2018
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