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The changes in plant and soil C pools and their C:N stoichiometry control grassland N retention under elevated N inputs

文献类型：期刊论文

作者Yang, Sen2; Liu, Weixing; Guo, Lulu2; Wang, Chengzhang2; Deng, Meifeng; Peng, Ziyang2; Liu, Lingli2
刊名ECOLOGICAL APPLICATIONS
出版日期2022
卷号32期号:2
关键词ecosystem N retention N deposition non-random species loss soil N retention subsoil topsoil
ISSN号1051-0761
DOI10.1002/eap.2517
文献子类Article
英文摘要Nitrogen (N) retention is a critical ecosystem function for maintaining soil fertility and mitigating pollution caused by anthropogenic N input. However, it has not yet been elucidated how responses of plant and soil regulate ecosystem N retention. Here, we combined a 14-year N addition experiment in a temperate steppe with a global meta-analysis in grasslands, to assess changes in carbon (C) pool size and stoichiometric C:N ratio of plant and soil components and evaluate the contribution of each component to grassland N retention under increasing N levels. We found that N addition increased N storage in the plant pool by stimulating biomass production and reducing tissue C:N at the community level. However, the non-random loss of forbs and legumes associated with a low C:N ratio partially offset the decline in community-level C:N ratio, thereby diminishing the positive net effect of N enrichment on plant N storage. The observed increase in soil N storage was predominantly determined by the decrease in C:N ratio of topsoil, while no changes were detected in the subsoil. On 14-year time scale, the upper limitation of N retention capacity in our study site was 167.02 g N/m(2). Global meta-analysis further indicated that a decade's N addition significantly increased the N storage in shoot, root and topsoil through enhancing the C pool and decreasing the C:N ratio, while did not affect those of subsoil. However, the positive correlation between the response of subsoil N storage and treatment duration further indicates that, though the accumulation of added N lagged behind that of topsoil, subsoil could play an important role in N retention on a longer time scale. Our study demonstrated that the enhanced plant productivity and altered physiological metabolism indicated by the decreased C:N ratio jointly determined grassland ecosystem N retention. The capacity of the grassland ecosystem to retain exogenous N input is limited, especially for a large amount of N input that occurs in a short period. However, in the context of chronically rising N deposition, the long-term N retention capacity of grasslands should largely depend on the response of subsoil, especially after topsoil N is saturated.
学科主题Ecology ; Environmental Sciences
出版地HOBOKEN
电子版国际标准刊号1939-5582
WOS关键词NITROGEN DEPOSITION ; COMMUNITY COMPOSITION ; BIODIVERSITY LOSS ; ORGANIC-MATTER ; CARBON STORAGE ; PRODUCTIVITY ; RESPONSES ; LIMITATION ; ENRICHMENT ; EFFICIENCY
WOS研究方向Science Citation Index Expanded (SCI-EXPANDED)
语种英语
WOS记录号WOS:000749549400001
出版者WILEY
资助机构National Natural Science Foundation of China [31770530, 31988102] ; Strategic Priority Research Program of the Chinese Academy of Sciences Grant [XDA23080301, XDA26010303]
源URL[http://ir.ibcas.ac.cn/handle/2S10CLM1/28898]  
专题植被与环境变化国家重点实验室
作者单位1.Univ Chinese Acad Sci, Beijing, Peoples R China
2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Yang, Sen,Liu, Weixing,Guo, Lulu,et al. The changes in plant and soil C pools and their C:N stoichiometry control grassland N retention under elevated N inputs[J]. ECOLOGICAL APPLICATIONS,2022,32(2).
APA Yang, Sen.,Liu, Weixing.,Guo, Lulu.,Wang, Chengzhang.,Deng, Meifeng.,...&Liu, Lingli.(2022).The changes in plant and soil C pools and their C:N stoichiometry control grassland N retention under elevated N inputs.ECOLOGICAL APPLICATIONS,32(2).
MLA Yang, Sen,et al."The changes in plant and soil C pools and their C:N stoichiometry control grassland N retention under elevated N inputs".ECOLOGICAL APPLICATIONS 32.2(2022).

入库方式： OAI收割

来源：植物研究所

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