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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-Francois and Hagedorn, Frank and Eisenhauer, Nico and Djukic, Ika and Weih, Martin and Löfgren, Stefan and Tóth, Zsolt (2021). Effects of Climate and Atmospheric Nitrogen Deposition on Early to Mid-Term Stage Litter Decomposition Across Biomes. Frontiers in forests and global change. 4 , 678480
[Research article]

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Abstract

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.

Authors/Creators: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-Francois and Hagedorn, Frank and Eisenhauer, Nico and Djukic, Ika and Weih, Martin and Löfgren, Stefan and Tóth, Zsolt
Title:Effects of Climate and Atmospheric Nitrogen Deposition on Early to Mid-Term Stage Litter Decomposition Across Biomes
Series Name/Journal:Frontiers in forests and global change
Year of publishing :2021
Volume:4
Article number:678480
Number of Pages:18
ISSN:2624-893X
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
Keywords:tea bag, Green tea, Rooibos tea, litter decomposition, carbon turnover, nitrogen deposition, TeaComposition initiative
URN:NBN:urn:nbn:se:slu:epsilon-p-113778
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-113778
Additional ID:
Type of IDID
DOI10.3389/ffgc.2021.678480
Web of Science (WoS)000678671500001
ID Code:25642
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Crop Production Ecology
(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:12 Oct 2021 13:25
Metadata Last Modified:12 Oct 2021 13:31

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