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

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; TeaComposition Network. 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. 18, pp. 10.3389/ffgc.2021.678480

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Abstract/Summary

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:	Publication - Article
Digital Object Identifier (DOI):	10.3389/ffgc.2021.678480
UKCEH and CEH Sections/Science Areas:	Biodiversity (Science Area 2017-)
ISSN:	2624-893X
Additional Information. Not used in RCUK Gateway to Research.:	UKCEH members of TeaComposition Network: Christoper Andrews, Jan Dick. Open Access paper - full text available via Official URL link.
Additional Keywords:	tea bag, green tea, Rooibos tea, litter decomposition, carbon turnover, nitrogen deposition, TeaComposition initiative
NORA Subject Terms:	Agriculture and Soil Science Biology and Microbiology
Date made live:	18 Mar 2022 15:12 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/532224

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