Linkages of plant stoichiometry to ecosystem production and carbon fluxes with increasing nitrogen inputs in an alpine steppe

doi:10.1111/gcb.13789

	Linkages of plant stoichiometry to ecosystem production and carbon fluxes with increasing nitrogen inputs in an alpine steppe
	Peng, Yunfeng 1; Li, Fei 1,2; Zhou, Guoying3,4 ; Fang, Kai 1,2; Zhang, Dianye 1,2; Li, Changbin 2,3,4; Yang, Guibiao 1,2; Wang, Guanqin 1,2; Wang, Jun 1,2; Yang, Yuanhe 1,2
刊名	GLOBAL CHANGE BIOLOGY
	2017-12-01
卷号	23 期号:12 页码:5249-5259
关键词	Carbon (c) Cycle Ecosystem Respiration Gross Ecosystem Productivity Net Ecosystem Carbon Exchange Nitrogen Addition Nitrogen:Phosphorous (n:p) Ratio N-p Imbalance
DOI	10.1111/gcb.13789
英文摘要	Unprecedented levels of nitrogen (N) have entered terrestrial ecosystems over the past century, which substantially influences the carbon (C) exchange between the atmosphere and biosphere. Temperature and moisture are generally regarded as themajor controllers over the N effects on ecosystem C uptake and release. N-phosphorous (P) stoichiometry regulates the growth and metabolisms of plants and soil organisms, thereby affecting many ecosystem C processes. However, it remains unclear how the N-induced shift in the plant N:P ratio affects ecosystem production and C fluxes and its relative importance. We conducted a field manipulative experiment with eight N addition levels in a Tibetan alpine steppe and assessed the influences of N on aboveground net primary production (ANPP), gross ecosystem productivity (GEP), ecosystem respiration (ER), and net ecosystem exchange (NEE); we used linear mixed-effects models to further determine the relative contributions of various factors to the N-induced changes in these parameters. Our results showed that the ANPP, GEP, ER, and NEE all exhibited nonlinear responses to increasing N additions. Further analysis demonstrated that the plant N:P ratio played a dominate role in shaping these C exchange processes. There was a positive relationship between the N-induced changes in ANPP (Delta ANPP) and the plant N:P ratio (Delta N:P), whereas the GEP, ER, and NEE exhibited quadratic correlations with the Delta N:P. In contrast, soil temperature and moisture were only secondary predictors for the changes in ecosystem production and C fluxes along the N addition gradient. These findings highlight the importance of plant N:P ratio in regulating ecosystem C exchange, which is crucial for improving our understanding of C cycles under the scenarios of global N enrichment.
语种	英语
WOS记录号	WOS:000414969000025
内容类型	期刊论文
源URL	[http://ir.nwipb.ac.cn/handle/363003/10363]
专题	西北高原生物研究所_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, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Northwest Inst Plateau Biol, Xining, Qinghai, Peoples R China 4.Chinese Acad Sci, Key Lab Tibetan Med Res, Xining, Qinghai, Peoples R China
推荐引用方式 GB/T 7714	Peng, Yunfeng,Li, Fei,Zhou, Guoying,et al. Linkages of plant stoichiometry to ecosystem production and carbon fluxes with increasing nitrogen inputs in an alpine steppe[J]. GLOBAL CHANGE BIOLOGY,2017,23(12):5249-5259.
APA	Peng, Yunfeng.,Li, Fei.,Zhou, Guoying.,Fang, Kai.,Zhang, Dianye.,...&Yang, Yuanhe.(2017).Linkages of plant stoichiometry to ecosystem production and carbon fluxes with increasing nitrogen inputs in an alpine steppe.GLOBAL CHANGE BIOLOGY,23(12),5249-5259.
MLA	Peng, Yunfeng,et al."Linkages of plant stoichiometry to ecosystem production and carbon fluxes with increasing nitrogen inputs in an alpine steppe".GLOBAL CHANGE BIOLOGY 23.12(2017):5249-5259.