Effects of Climate and Atmospheric Nitrogen Deposition on Early to Mid-Term Stage Litter Decomposition Across Biomes

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TeaComposition Network , Kwon , T , Shibata , H , Kepfer-Rojas , S , Schmidt , I K , Larsen , K S , Beier , C , Berg , B , Verheyen , K , Lamarque , J-F , Hagedorn , F , Eisenhauer , N , Djukic , I , Loehr , J , Virkkala , A-M & Luoto , M 2021 , ' Effects of Climate and Atmospheric Nitrogen Deposition on Early to Mid-Term Stage Litter Decomposition Across Biomes ' , Frontiers in Forests and Global Change , vol. 4 , 678480 . https://doi.org/10.3389/ffgc.2021.678480

Title: Effects of Climate and Atmospheric Nitrogen Deposition on Early to Mid-Term Stage Litter Decomposition Across Biomes
Author: TeaComposition Network; Kwon, TaeOh; Shibata, Hideaki; Kepfer-Rojas, Sebastian; Schmidt, Inger K.; Larsen, Klaus S.; Beier, Claus; Berg, Björn; Verheyen, Kris; Lamarque, Jean-Francois; Hagedorn, Frank; Eisenhauer, Nico; Djukic, Ika; Loehr, John; Virkkala, Anna-Maria; Luoto, Miska
Contributor organization: Department of Forest Sciences
Lammi Biological Station
Biological stations
Department of Geosciences and Geography
Helsinki Institute of Sustainability Science (HELSUS)
BioGeoClimate Modelling Lab
Date: 2021-07-14
Language: eng
Number of pages: 18
Belongs to series: Frontiers in Forests and Global Change
ISSN: 2624-893X
DOI: https://doi.org/10.3389/ffgc.2021.678480
URI: http://hdl.handle.net/10138/333244
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.
Subject: tea bag
Green tea
Rooibos tea
litter decomposition
carbon turnover
nitrogen deposition
TeaComposition initiative
1181 Ecology, evolutionary biology
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

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