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Effects of climate and atmospheric nitrogen deposition on early to mid-term stage litter decomposition across biomes

Kwon, TaeOh and Shibata, Hideaki and Kepfer-Rojas, Sebastian and Schmidt, Inger K. and Larsen, Klaus S. and Beier, Claus and Berg, Bjorn and Verheyen, Kris and Lamarque, Jean-François and Hagedorn, Frank and Eisenhauer, Nico and Djukic, Ika and Network, TeaComposition and Probst, Jean-Luc and Probst, Anne and Camboulive, Thierry Effects of climate and atmospheric nitrogen deposition on early to mid-term stage litter decomposition across biomes. (2021) Frontiers in Forests and Global Changes.

(Document in English)

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Official URL: https://doi.org/10.3389/ffgc.2021.678480


Litter decomposition is a key process for carbon and nutrient cycling in terrestrial ecosystems and is mainly controlled by environmental conditions, substrate quantity and quality as well as microbial community abundance and composition. In particular, the effects of climate and atmospheric nitrogen (N) deposition on litter decomposition and its temporal dynamics are of significant importance, since their effects might change over the course of the decomposition process. Within the TeaComposition initiative, we incubated Green and Rooibos teas at 524 sites across nine biomes. We assessed how macroclimate and atmospheric inorganic N deposition under current and predicted scenarios (RCP 2.6, RCP 8.5) might affect litter mass loss measured after 3 and 12 months. Our study shows that the early to mid-term mass loss at the global scale was affected predominantly by litter quality (explaining 73% and 62% of the total variance after 3 and 12 months, respectively) followed by climate and N deposition. The effects of climate were not litter-specific and became increasingly significant as decomposition progressed, with MAP explaining 2% and MAT 4% of the variation after 12 months of incubation. The effect of N deposition was litter-specific, and significant only for 12-month decomposition of Rooibos tea at the global scale. However, in the temperate biome where atmospheric N deposition rates are relatively high, the 12-month mass loss of Green and Rooibos teas decreased significantly with increasing N deposition, explaining 9.5% and 1.1% of the variance, respectively. The expected changes in macroclimate and N deposition at the global scale by the end of this century are estimated to increase the 12-month mass loss of easily decomposable litter by 1.1– 3.5% and of the more stable substrates by 3.8–10.6%, relative to current mass loss. In contrast, expected changes in atmospheric N deposition will decrease the mid-term mass loss of high-quality litter by 1.4–2.2% and that of low-quality litter by 0.9–1.5% in the temperate biome. Our results suggest that projected increases in N deposition may have the capacity to dampen the climate-driven increases in litter decomposition depending on the biome and decomposition stage of substrate.

Item Type:Article
Additional Information:This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. This article is available at : https://www.frontiersin.org/articles/10.3389/ffgc.2021.678480/full
HAL Id:hal-03403978
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > University of Helsinki (FINLAND)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Hokkaido University (JAPAN)
Other partners > German Centre for Integrative Biodiversity Research - iDiv (GERMANY)
Other partners > Universität Leipzig (GERMANY)
Other partners > National Center for Atmospheric Research - NCAR (UNITED STATES)
Other partners > Forschungsanstalt für Wald, Schnee und Landschaft - WSL (SWITZERLAND)
Other partners > Tea composition (SWITZERLAND)
Other partners > Universiteit Gent - UGENT (BELGIUM)
Other partners > University of Copenhagen - UCPH (DENMARK)
Laboratory name:
ILTER - German Research Foundation (FZT 118) - European Union’s Horizon 2020 Research and Innovation Program (Grant Agreement No. 677232) - CESAM (UIDB/50017/2020 C UIDP/50017/2020) - PORBIOTA (POCI-01-0145-FEDER-022127). - CEECIND/00962/2017 - FCT support to cE3c through UID/BIA/00329/2013, UID/BIA/00329/2019, and UIDB/00329/2020 - PORBIOTA - POCI-01- 0145-FEDER-022127 - UNILEVER - LTSER Zone Atelier Pyrénées-Garonne (ZA PYGAR) - LTER Bassin versant du Baget - LTER Bassin versant d'Auradé
Deposited On:10 Nov 2021 16:32

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