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

doi:10.1088/1748-9326/aa5ba6

NWIPB OpenIR

	Nonlinear response of soil respiration to increasing nitrogen additions in a Tibetan alpine steppe
	Peng, Yunfeng 1; Li, Fei 1,2; Zhou, Guoying 3,4; Fang, Kai 1; Zhang, Dianye 1; Li, Changbin 2,3,4; Yang, Guibiao 1; Wang, Guanqin 1; Wang, Jun 1; Mohammat, Anwar 5; Yang, Yuanhe 1
	2017-02-01
发表期刊	ENVIRONMENTAL RESEARCH LETTERS
卷号	12 期号:2
文章类型	Article
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.
关键词	Autotrophic Respiration Carbon (c) Cycling Heterotrophic Respiration Nitrogen (n) Input Structural Equation Modeling (Sem)
WOS标题词	Science & Technology ; Life Sciences & Biomedicine ; Physical Sciences
DOI	10.1088/1748-9326/aa5ba6
关键词[WOS]	ECOSYSTEM CARBON EXCHANGE ; TEMPERATE STEPPE ; FOREST ECOSYSTEMS ; MICROBIAL BIOMASS ; CO2 EFFLUX ; NUTRIENT AVAILABILITY ; ROOT PRODUCTION ; CLIMATE-CHANGE ; DEPOSITION ; ENRICHMENT
收录类别	SCI
语种	英语
项目资助者	National Natural Science Foundation of China(31670482 ; China Postdoctoral Science Foundation(2013M540160 ; Chinese Academy of Sciences-Peking University Pioneer Collaboration Team ; Thousand Young Talents Program ; 31400417 ; 2014T70140) ; 31322011)
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000395741500002
引用统计	被引频次：45[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/6801
专题	中国科学院西北高原生物研究所
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810008, Peoples R China 4.Chinese Acad Sci, Key Lab Tibetan Med Res, Xining 810008, Peoples R China 5.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Urumqi 830011, 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).