气候变化领域集成服务门户(CCPortal): Excessive nitrogen addition accelerates N assimilation and P utilization by enhancing organic carbon decomposition in a Tibetan alpine steppe

CCPortal

DOI	10.1016/j.scitotenv.2020.142848
	Excessive nitrogen addition accelerates N assimilation and P utilization by enhancing organic carbon decomposition in a Tibetan alpine steppe
	Chen, Qiuyu; Yuan, Yanli; Hu, Yilun; Wang, Jian; Si, Guicai; Xu, Ri; Zhou, Jizhong; Xi, Chuanwu; Hu, Ang; Zhang, Gengxin
通讯作者	Zhang, GX (通讯作者)，Chinese Acad Sci, CAS Key Lab Alpine Ecol, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China.
发表日期	2021
ISSN	0048-9697
EISSN	1879-1026
卷号	764
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.
英文关键词	Alpine steppe; Multilevel N additions; Microbial functional genes; Carbon cycle; Nitrogen cycle; Phosphorus cycle
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000614249600045
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/255126
作者单位	[Chen, Qiuyu; Yuan, Yanli; Hu, Yilun; Xu, Ri; Zhang, Gengxin] Chinese Acad Sci, Inst Tibetan Plateau Res, CAS Key Lab Alpine Ecol, Beijing 100101, Peoples R China; [Hu, Yilun] Univ Chinese Acad Sci, Beijing 100101, Peoples R China; [Wang, Jian] China West Normal Univ, Land & Resources Coll, Nanchong 637009, Sichuan, Peoples R China; [Si, Guicai] Chinese Acad Sci, Lanzhou Ctr Oil & Gas Resources, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China; [Zhou, Jizhong] Univ Oklahoma, Inst Environm Genom, Norman, OK 73019 USA; [Zhou, Jizhong] Univ Oklahoma, Dept Microbiol & Plant Biol, Norman, OK 73019 USA; [Zhou, Jizhong] Tsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China; [Xi, Chuanwu] Univ Michigan, Sch Publ Hlth, Dept Environm Hlth Sci, Ann Arbor, MI 48109 USA; [Hu, Ang] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China; [Zhang, Gengxin] Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Be...
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]. 中国科学院西北生态环境资源研究院,2021,764.
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.
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).