Increasing rates of long-term nitrogen deposition consistently increased litter decomposition in a semi-arid grassland

• The continuing nitrogen (N) deposition observed worldwide alters ecosystem nutrient cycling and ecosystem functioning. Litter decomposition is a key process contributing to these changes, but the numerous mechanisms for altered decomposition remain poorly identified. • We assessed these different...

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Vydáno v:	The New phytologist Ročník 229; číslo 1; s. 296 - 307
Hlavní autoři:	Hou, Shuang-Li, Hättenschwiler, Stephan, Yang, Jun-Jie, Sistla, Seeta, Wei, Hai-Wei, Zhang, Zhi-Wei, Hu, Yan-Yu, Wang, Ru-Zhen, Cui, Shu-Yan, Lü, Xiao-Tao, Han, Xing-Guo
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	England Wiley 01.01.2021 Wiley Subscription Services, Inc
Témata:	Achnatherum sibiricum Agropyron cristatum Aridity Availability Biodiversity and Ecology Carbon-nitrogen ratio Community composition community level Community structure Composition Cycles Decomposition Deposition Ecological function Ecosystem Ecosystems Environmental Sciences fungi Grassland Grasslands Leymus chinensis Litter litter quality Manganese microbial communities Microorganisms Mineral nutrients Nitrogen nitrogen addition Nutrient cycles Nutrient dynamics Organic matter pH effects Plant Leaves Plant species Plants Poaceae Soil Soil chemistry soil C : N Soil dynamics soil microbial community structure Soil organic matter Soil pH Soil structure Soils Species composition species diversity Stipa grandis litter quality soil C : N community level soil pH nitrogen addition soil microbial community structure manganese
ISSN:	0028-646X, 1469-8137, 1469-8137
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Shrnutí:	• The continuing nitrogen (N) deposition observed worldwide alters ecosystem nutrient cycling and ecosystem functioning. Litter decomposition is a key process contributing to these changes, but the numerous mechanisms for altered decomposition remain poorly identified. • We assessed these different mechanisms with a decomposition experiment using litter from four abundant species (Achnatherum sibiricum, Agropyron cristatum, Leymus chinensis and Stipa grandis) and litter mixtures representing treatment-specific community composition in a semi-arid grassland under long-term simulation of six different rates of N deposition. • Decomposition increased consistently with increasing rates of N addition in all litter types. Higher soil manganese (Mn) availability, which apparently was a consequence of N addition-induced lower soil pH, was the most important factor for faster decomposition. Soil C : N ratios were lower with N addition that subsequently led to markedly higher bacterial to fungal ratios, which also stimulated litter decomposition. • Several factors contributed jointly to higher rates of litter decomposition in response to N deposition. Shifts in plant species composition and litter quality played a minor role compared to N-driven reductions in soil pH and C : N, which increased soil Mn availability and altered microbial community structure. The soil-driven effect on decomposition reported here may have long-lasting impacts on nutrient cycling, soil organic matter dynamics and ecosystem functioning.
Bibliografie:	These authors contributed equally to this work. ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	0028-646X 1469-8137 1469-8137
DOI:	10.1111/nph.16854