Litter chemical structure is more important than species richness in affecting soil carbon and nitrogen dynamics including gas emissions from an alpine soil
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- 作者：Youchao Chen ; Jian Sun ; Fangting Xie ; Xiaodan Wang…
- 关键词：Plant diversity ; Litter chemical structure ; Soil C and N ; Alpine steppe ; Tibetan Plateau
- 刊名：Biology and Fertility of Soils
- 出版年：2015
- 出版时间：October 2015
- 年：2015
- 卷：51
- 期：7
- 页码：791-800
- 全文大小：523 KB
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Jian Sun (3)
Fangting Xie (1) (2)
Xiaodan Wang (1)
Genwei Cheng (1)
Xuyang Lu (1)
1. Key Laboratory of Mountain Surface Processes and Ecological Regulation, Chinese Academy of Sciences, Chengdu, 610041, China
2. Graduate University of the Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100101, China
3. Key Laboratory of Ecosystem Network Observation and Modelling, Chinese Academy of Sciences, Beijing, 100101, China - 刊物类别：Earth and Environmental Science
- 刊物主题：Life Sciences
Agriculture
Soil Science and Conservation - 出版者：Springer Berlin / Heidelberg
- ISSN：1432-0789
文摘
Plant litter can influence many fundamental ecosystem functions during decomposition. However, the mechanism of litter diversity effects on belowground ecological processes remains unclear, especially with regard to soil C and the N cycle in alpine ecosystems. In this study, we incubated the litter of four alpine steppe species (SP: Stipa purpurea, CM: Carex moorcroftii, LP: Leontopodium pusillum, AN: Artemisia nanschanica) alone or in mixture with soil. The litter-mixing experiment was conducted to determine the effects of litter diversity on soil C and N dynamics in an alpine steppe in Northern Tibet. Litter treatments significantly enhanced CO2 and N2O emissions and decreased CH4 immobilization in general; soil organic C, total N, water soluble organic C, water soluble organic N, microbial biomass C, microbial biomass N, and urease activity were also enhanced, while soil total inorganic N was decreased by litter treatments. Plant species richness poorly affected soil C and N dynamics, while litter chemical structure, such as C, N, lingin:N, phenol:N, cellulose, and cellulose:N, significantly affected soil C and N dynamics. Non-additive effects of litter mixture were predominant on soil C and N dynamics, while antagonistic effects were more frequent than synergistic effects. These results indicated that litter addition can significantly impact soil C and N dynamics through non-additive effects of litter mixture, and litter chemical structure is more important than species richness in affecting soil C and N dynamics of the alpine steppe in Northern Tibet. Keywords Plant diversity Litter chemical structure Soil C and N Alpine steppe Tibetan Plateau