Median to Strong Rainfall Intensity Favors Carbon Sink in a Temperate Grassland Ecosystem in China

doi:10.3390/su11226376

	Median to Strong Rainfall Intensity Favors Carbon Sink in a Temperate Grassland Ecosystem in China
	Hao, Guangcun 2; Hu, Zhongmin 2,3; Guo, Qun 1,4; Di, Kai 2; Li, Shenggong 1,4
刊名	SUSTAINABILITY
	2019-11-01
卷号	11 期号:22 页码:13
关键词	climate change rainfall pattern grassland ecosystem carbon exchange
DOI	10.3390/su11226376
通讯作者	Hu, Zhongmin(huzm@m.scnu.edu.cn)
英文摘要	Over the past 50 years, rainfall events have made significant alterations to environments due to global warming. The grasslands in arid and semi-arid regions are extremely sensitive to variations in rainfall patterns, which are considered to significantly affect ecosystem functions. In this study, an experiment with varying rainfall sizes and frequencies (0 mm, 2 mm, 5 mm, 10 mm, 20 mm, and 40 mm) was conducted during growing seasons in typical grasslands, to study the effect of changes in rainfall regime on net ecosystem exchange (NEE). Our results indicated that NEE exhibited nonlinear responses to rainfall treatments, and reached its peak under 20 mm in middle growing season. Further, the component fluxes of both NEE (i.e., gross primary productivity (GPP)) and ecosystem respiration (ER) illustrated nonlinear responses to treatment gradient, with peak values at 20 mm and 5 mm, respectively. Based on five-year eddy flux measurements, further analyses demonstrated that GPP and ER increased with increasing soil moisture, and net ecosystem carbon uptake (-1*NEE) was significantly stimulated due to a more enhanced GPP than ER, when soil moisture was above 8%. Additionally, we found that the response of root biomass was different from that of carbon fluxes to changes in rainfall patterns. Overall, these findings highlight the importance of both changes in rainfall regimes in controlling ecosystem C exchange and investigation of the potential threshold for ecosystem function shifts, which are crucial to further understand C cycles in grasslands.
资助项目	National Key R&D Program of China[2016YFC0501603] ; National Key R&D Program of China[2017YFA060481] ; National Natural Science Foundation of China[31922053] ; National Natural Science Foundation of China[31570437] ; Startup Foundation for Talented Scholars in South China Normal University[S82360]
WOS关键词	SOIL RESPIRATION ; PRECIPITATION PULSE ; INNER-MONGOLIA ; EXCHANGE ; NITROGEN ; RESPONSES ; WATER ; VARIABILITY ; PRODUCTIVITY ; RESILIENCE
WOS研究方向	Science & Technology - Other Topics ; Environmental Sciences & Ecology
语种	英语
出版者	MDPI
WOS记录号	WOS:000503277900189
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China ; Startup Foundation for Talented Scholars in South China Normal University
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/131097]
专题	中国科学院地理科学与资源研究所
通讯作者	Hu, Zhongmin
作者单位	1.Chinese Acad Sci, Synth Res Ctr Chinese Ecosyst Res Network, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 2.South China Normal Univ, Sch Geog, Guangzhou 510631, Guangdong, Peoples R China 3.Southern Marine Sci & Engn Guangdong Lab, Zhuhai 519082, Peoples R China 4.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Hao, Guangcun,Hu, Zhongmin,Guo, Qun,et al. Median to Strong Rainfall Intensity Favors Carbon Sink in a Temperate Grassland Ecosystem in China[J]. SUSTAINABILITY,2019,11(22):13.
APA	Hao, Guangcun,Hu, Zhongmin,Guo, Qun,Di, Kai,&Li, Shenggong.(2019).Median to Strong Rainfall Intensity Favors Carbon Sink in a Temperate Grassland Ecosystem in China.SUSTAINABILITY,11(22),13.
MLA	Hao, Guangcun,et al."Median to Strong Rainfall Intensity Favors Carbon Sink in a Temperate Grassland Ecosystem in China".SUSTAINABILITY 11.22(2019):13.