Nonlinear response of soil respiration to increasing nitrogen additions in a Tibetan alpine steppe

doi:10.1186/s13059-017-1342-8

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	Nonlinear response of soil respiration to increasing nitrogen additions in a Tibetan alpine steppe
	Peng, Yunfeng ; Li, Fei 4; Zhou, Guoying 3,5; Fang, Kai ; Zhang, Dianye ; Li, Changbin 3,4,5; Yang, Guibiao ; Wang, Guanqin ; Wang, Jun ; Mohammat, Anwar 1
刊名	ENVIRONMENTAL RESEARCH LETTERS
	2017
卷号	12 期号:2
关键词	autotrophic respiration carbon (C) cycling heterotrophic respiration nitrogen (N) input structural equation modeling (SEM)
ISSN号	1748-9326
DOI	10.1186/s13059-017-1342-8
文献子类	Article
英文摘要	Nitrogen (N) availability is a key regulator of carbon (C) cycling in terrestrial ecosystems. Anthropogenic N input, such as N deposition and fertilization, increases N availability in soil, which has important implications for an ecosystem's C storage and loss. Soil respiration (Rs), which is the second largest C flux from terrestrial ecosystems to the atmosphere, plays an important role in terrestrial C cycles. The direction and magnitude of the responses of Rs and its components to N addition have been widely evaluated, but it remains unclear how these processes change across multiple N addition levels. Here we conducted a two-year field experiment to examine the changes of Rs and its autotrophic respiration (Ra) and heterotrophic respiration (Rh) components along a gradient of eight N levels (0, 1 2, 4, 8, 16, 24, 32 g m(-2) yr(-1)) in a Tibetan alpine steppe, and used structural equation modeling (SEM) to explore the relative contributions of biotic and abiotic variables and their direct and indirect pathways regulating the Ra and Rh. Our results indicated that both Rs and Ra exhibited first increasing and then subsequent decreasing trends at the threshold of 8 g N m(-2) yr(-1). In contrast, the Rh declined linearly with the N addition rate continuously increasing. SEM analysis revealed that, among various environmental factors, soil temperature was the most important one modulating Rs, which not only had a direct effect on the two Rs components, but also indirectly regulated the Ra and Rh via root and microbial biomass. These findings suggest that the nonlinear response patterns of Rs should be considered for better predicting terrestrial C balance, given that anthropogenic N input to the terrestrial ecosystems is increasing continuously.
学科主题	Biotechnology & Applied Microbiology ; Genetics & Heredity
出版地	BRISTOL
WOS关键词	ECOSYSTEM CARBON EXCHANGE ; CO2 EFFLUX ; TEMPERATURE SENSITIVITY ; MICROBIAL BIOMASS ; ROOT PRODUCTION ; DEPOSITION ; CLIMATE ; COMPONENTS ; WATER ; SEQUESTRATION
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000415306700001
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31670482, 31400417, 31322011] ; China Postdoctoral Science FoundationChina Postdoctoral Science Foundation [2013M540160, 2014T70140] ; Chinese Academy of Sciences-Peking University Pioneer Collaboration Team ; Thousand Young Talents ProgramChinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/22334]
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Key Lab Tibetan Med Res, Xining 810008, Peoples R China 2.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 5.Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810008, Peoples R China
推荐引用方式 GB/T 7714	Peng, Yunfeng,Li, Fei,Zhou, Guoying,et al. Nonlinear response of soil respiration to increasing nitrogen additions in a Tibetan alpine steppe[J]. ENVIRONMENTAL RESEARCH LETTERS,2017,12(2).
APA	Peng, Yunfeng.,Li, Fei.,Zhou, Guoying.,Fang, Kai.,Zhang, Dianye.,...&Yang, Yuanhe.(2017).Nonlinear response of soil respiration to increasing nitrogen additions in a Tibetan alpine steppe.ENVIRONMENTAL RESEARCH LETTERS,12(2).
MLA	Peng, Yunfeng,et al."Nonlinear response of soil respiration to increasing nitrogen additions in a Tibetan alpine steppe".ENVIRONMENTAL RESEARCH LETTERS 12.2(2017).