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Excessive nitrogen addition accelerates N assimilation and P utilization by enhancing organic carbon decomposition in a Tibetan alpine steppe

文献类型：期刊论文

作者Chen, Qiuyu2; Yuan, Yanli2; Hu, Yilun1,2; Wang, Jian10; Si, Guicai9; Xu, Ri2; Zhou, Jizhong3,4,6; Xi, Chuanwu5; Hu, Ang7; Zhang, Gengxin2,8
刊名SCIENCE OF THE TOTAL ENVIRONMENT
出版日期2021-04-10
卷号764页码:10
ISSN号0048-9697
关键词Alpine steppe Multilevel N additions Microbial functional genes Carbon cycle Nitrogen cycle Phosphorus cycle
DOI10.1016/j.scitotenv.2020.142848
英文摘要High amounts of deposited nitrogen (N) dramatically influence the stability and functions of alpine ecosystems by changing soil microbial community functions, but the mechanism is still unclear. To investigate the impacts of increased N deposition on microbial community functions, a 2-year multilevel N addition (0, 10, 20, 40, 80 and 160 kg N ha(-1) year(-1)) field experiment was set up in an alpine steppe on the Tibetan Plateau. Soil microbial functional genes (GeoChip 4.6), together with soil enzyme activity, soil organic compounds and environmental variables, were used to explore the response of microbial community functions to N additions. The results showed that the N addition rate of 40 kg N ha(-1) year(-1) was the critical value for soil microbial functional genes in this alpine steppe. A small amount of added N (<= 40 kg N ha(-1) year(-1)) had no significant effects on the abundance of microbial functional genes, while high amounts of added N (>40 kg N ha(-1) year(-1)) significantly increased the abundance of soil organic carbon degradation genes. Additionally, the abundance of microbial functional genes associated with NH4+, including ammonification, N fixation and assimilatory nitrate reduction pathways, was significantly increased under high N additions. Further, high N additions also increased soil organic phosphorus utilization, which was indicated by the increase in the abundance of phytase genes and alkaline phosphatase activity. Plant richness, soil NO2-/NH4+ and WSOC/WSON were significantly correlated with the abundance of microbial functional genes, which drove the changes in microbial community functions under N additions. These findings help us to predict that increased N deposition in the future may alter soil microbial functional structure, which will lead to changes in microbially-mediated biogeochemical dynamics in alpine steppes on the Tibetan Plateau and will have extraordinary impacts on microbial C, N and P cycles. (C) 2020 Elsevier B.V. All rights reserved.
资助项目National Natural Science Foundation of China[41871066] ; National Natural Science Foundation of China[41201236] ; National Natural Science Foundation of China[41471055] ; National Natural Science Foundation of China[41701084] ; National Natural Science Foundation of China[41877460] ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences[XDA20050101] ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences[XDA20050102] ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0503]
WOS研究方向Environmental Sciences & Ecology
语种英语
出版者ELSEVIER
WOS记录号WOS:000614249600045
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP)
源URL[http://ir.iggcas.ac.cn/handle/132A11/100126]  
专题地质与地球物理研究所_兰州油气中心
通讯作者Zhang, Gengxin
作者单位1.Univ Chinese Acad Sci, Beijing 100101, Peoples R China
2.Chinese Acad Sci, Inst Tibetan Plateau Res, CAS Key Lab Alpine Ecol, Beijing 100101, Peoples R China
3.Univ Oklahoma, Inst Environm Genom, Norman, OK 73019 USA
4.Univ Oklahoma, Dept Microbiol & Plant Biol, Norman, OK 73019 USA
5.Univ Michigan, Sch Publ Hlth, Dept Environm Hlth Sci, Ann Arbor, MI 48109 USA
6.Tsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China
7.Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China
8.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
9.Chinese Acad Sci, Lanzhou Ctr Oil & Gas Resources, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China
10.China West Normal Univ, Land & Resources Coll, Nanchong 637009, Sichuan, Peoples R China
推荐引用方式
GB/T 7714		 Chen, Qiuyu,Yuan, Yanli,Hu, Yilun,et al. Excessive nitrogen addition accelerates N assimilation and P utilization by enhancing organic carbon decomposition in a Tibetan alpine steppe[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2021,764:10.
APA Chen, Qiuyu.,Yuan, Yanli.,Hu, Yilun.,Wang, Jian.,Si, Guicai.,...&Zhang, Gengxin.(2021).Excessive nitrogen addition accelerates N assimilation and P utilization by enhancing organic carbon decomposition in a Tibetan alpine steppe.SCIENCE OF THE TOTAL ENVIRONMENT,764,10.
MLA Chen, Qiuyu,et al."Excessive nitrogen addition accelerates N assimilation and P utilization by enhancing organic carbon decomposition in a Tibetan alpine steppe".SCIENCE OF THE TOTAL ENVIRONMENT 764(2021):10.

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来源：地质与地球物理研究所

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