Warming effects on permafrost ecosystem carbon fluxes associated with plant nutrients

doi:10.1371/journal.pone.0166603

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	Warming effects on permafrost ecosystem carbon fluxes associated with plant nutrients
	Li, Fei 4; Peng, Yunfeng ; Natali, Susan M.; Chen, Kelong 2; Han, Tianfeng ; Yang, Guibiao 4; Ding, Jinzhi 4; Zhang, Dianye 4; Wang, Guanqin 4; wang, Jun 4
刊名	ECOLOGY
	2017
卷号	98 期号:11 页码:2851-2859
关键词	alpine ecosystems carbon-climate feedback climate warming nutrient limitation permafrost carbon cycle Tibetan Plateau
ISSN号	0012-9658
DOI	10.1371/journal.pone.0166603
文献子类	Article
英文摘要	Large uncertainties exist in carbon (C)-climate feedback in permafrost regions, partly due to an insufficient understanding of warming effects on nutrient availabilities and their subsequent impacts on vegetation C sequestration. Although a warming climate may promote a substantial release of soil C to the atmosphere, a warming-induced increase in soil nutrient availability may enhance plant productivity, thus offsetting C loss from microbial respiration. Here, we present evidence that the positive temperature effect on carbon dioxide (CO2) fluxes may be weakened by reduced plant nitrogen (N) and phosphorous (P) concentrations in a Tibetan permafrost ecosystem. Although experimental warming initially enhanced ecosystem CO2 uptake, the increased rate disappeared after the period of peak plant growth during the early growing season, even though soil moisture was not a limiting factor in this swamp meadow ecosystem. We observed that warming did not significantly affect soil extractable N or P during the period of peak growth, but decreased both N and P concentrations in the leaves of dominant plant species, likely caused by accelerated plant senescence in the warmed plots. The attenuated warming effect on CO2 assimilation during the late growing season was associated with lowered leaf N and P concentrations. These findings suggest that warming-mediated nutrient changes may not always benefit ecosystem C uptake in permafrost regions, making our ability to predict the C balance in these warming-sensitive ecosystems more challenging than previously thought.
学科主题	Science & Technology - Other Topics
电子版国际标准刊号	1939-9170
出版地	HOBOKEN
WOS关键词	MICROBIAL BIOMASS CALIBRATION ; FUMIGATION-EXTRACTION METHOD ; TIBETAN PLATEAU ; CLIMATE-CHANGE ; ALPINE MEADOW ; SOIL ; NITROGEN ; AVAILABILITY ; COMMUNITIES ; INCREASES
语种	英语
出版者	WILEY
WOS记录号	WOS:000391641500010
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31670482, 31770521, 41371213] ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences [QYZDB-SSW-SMC049] ; Chinese Academy of Sciences-Peking University Pioneer Cooperation Team ; Thousand Young Talents ProgramChinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/22109]
专题	植被与环境变化国家重点实验室
作者单位	1.Qinghai Normal Univ, Coll Life & Geog Sci, Xining 810008, Peoples R China 2.Natali, Susan M.] Woods Hole Res Ctr, 149 Woods Hole Rd, Falmouth, MA 02540 USA 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
推荐引用方式 GB/T 7714	Li, Fei,Peng, Yunfeng,Natali, Susan M.,et al. Warming effects on permafrost ecosystem carbon fluxes associated with plant nutrients[J]. ECOLOGY,2017,98(11):2851-2859.
APA	Li, Fei.,Peng, Yunfeng.,Natali, Susan M..,Chen, Kelong.,Han, Tianfeng.,...&Yang, Yuanhe.(2017).Warming effects on permafrost ecosystem carbon fluxes associated with plant nutrients.ECOLOGY,98(11),2851-2859.
MLA	Li, Fei,et al."Warming effects on permafrost ecosystem carbon fluxes associated with plant nutrients".ECOLOGY 98.11(2017):2851-2859.