Heat waves reduce ecosystem carbon sink strength in a Eurasian meadow steppe

doi:10.1016/j.envres.2015.09.004

	Heat waves reduce ecosystem carbon sink strength in a Eurasian meadow steppe
	Qu, Luping 1; Chen, Jiquan 2; Dong, Gang 3; Jiang, Shicheng ; Li, Linghao1 ; Guo, Jixun ; Shao, Changliang 1,2
	2016
发表期刊	ENVIRONMENTAL RESEARCH
ISSN	0013-9351
卷号	144 页码:39-48
摘要	Background: As a consequence of global change, intensity and frequency of extreme events such as heat waves (HW) have been increasing worldwide. Methods: By using a combination of continuous 60-year meteorological and 6-year tower-based carbon dioxide (CO2) flux measurements, we constructed a clear picture of a HWs effect on the dynamics of carbon, water, and vegetation on the Eurasian Songnen meadow steppe. Results: The number of HWs in the Songnen meadow steppe began increasing since the 1980s and the rate of occurrence has advanced since the 2010s to higher than ever before. HWs can reduce the grassland carbon flux, while net ecosystem carbon exchange (NEE) will regularly fluctuate for 4-5 days during the HW before decreasing. However, ecosystem respiration (Re) and gross ecosystem production (GEP) decline from the beginning of the HW until the end, where Re and GEP will decrease 30% and 50%, respectively. When HWs last five days, water-use efficiency (WUE) will decrease by 26%, soil water content (SWC) by 30% and soil water potential (SWP) will increase by 38%. In addition, the soil temperature will still remain high after the HW although the air temperature will recover to its previous state. Conclusions: HWs, as an extreme weather event, have increased during the last two decades in the Songnen meadow steppe. HWs will reduce the carbon flux of the steppe and will cause a sustained impact. Drought may be the main reason why HWs decrease carbon flux. At the later stages of or after a HW, the ecosystem usually lacks water and the soil becomes so hot and dry that it prevents roots from absorbing enough water to maintain their metabolism. This is the main reason why this grassland carbon exchange decreases during and after HWs. (C) 2015 Elsevier Inc. All rights reserved.
关键词	Extreme climate Global change Eddy covariance Grassland Carbon flux Temperature
学科领域	Environmental Sciences ; Public, Environmental & Occupational Health
DOI	10.1016/j.envres.2015.09.004
收录类别	SCI
语种	英语
WOS关键词	WATER AVAILABILITY ; ELEVATED CO2 ; TEMPERATURE ; PLANT ; DROUGHT ; FLUXES ; GROWTH ; PRODUCTIVITY ; PHOTOSYNTHESIS ; COMMUNITIES
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000366443200005
出版者	ACADEMIC PRESS INC ELSEVIER SCIENCE
Special Issue	SI
文献子类	Article
出版地	SAN DIEGO
EISSN	1096-0953
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31170454] ; LULUC program of NASA [NNX14AD85G] ; US-China Carbon Consortium
作者邮箱	gjixun@nenu.edu.cn ; zkyscl@ibcas.ac.cn
引用统计	被引频次：28[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/25234
专题	植被与环境变化国家重点实验室
作者单位	1.NE Normal Univ, Inst Grassland Sci, Changchun 130024, Jilin, Peoples R China 2.Chinese Acad Sci, Inst Bot, Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 3.Michigan State Univ, CGCEO Geog, E Lansing, MI 48824 USA 4.Shanxi Univ, Sch Life Sci, Taiyuan 030006, Peoples R China
推荐引用方式 GB/T 7714	Qu, Luping,Chen, Jiquan,Dong, Gang,et al. Heat waves reduce ecosystem carbon sink strength in a Eurasian meadow steppe[J]. ENVIRONMENTAL RESEARCH,2016,144:39-48.
APA	Qu, Luping.,Chen, Jiquan.,Dong, Gang.,Jiang, Shicheng.,Li, Linghao.,...&Shao, Changliang.(2016).Heat waves reduce ecosystem carbon sink strength in a Eurasian meadow steppe.ENVIRONMENTAL RESEARCH,144,39-48.
MLA	Qu, Luping,et al."Heat waves reduce ecosystem carbon sink strength in a Eurasian meadow steppe".ENVIRONMENTAL RESEARCH 144(2016):39-48.

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