干旱区生态环境知识资源中心(Arid): Seasonal and interannual variations in carbon fluxes in East Asia semi-arid grasslands

Arid

DOI	10.1016/j.scitotenv.2019.02.378
	Seasonal and interannual variations in carbon fluxes in East Asia semi-arid grasslands
	Zhao, Huichen 1,2; Jia, Gensuo 1; Wang, Hesong 3; Zhang, Anzhi 1; Xu, Xiyan 1
通讯作者	Jia, Gensuo
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2019
卷号	668 页码:1128-1138
英文摘要	Semiarid regions have substantial interannual variation in carbon exchange between terrestrial ecosystem and atmosphere but the diverse responses of carbon fluxes to climate variability are poorly known. We compared carbon exchange processes and the responses to environmental factors in a meadow steppe at Tongyu (TY) and a typical steppe at Maodeng (MD) using long-term continuous eddy covariance measurements. TY precipitation was 25% greater than MD. Both grasslands had interannual fluctuations of carbon sink and source and acted as weak carbon sinks averagely (-22.9 +/- 41.0 gCm(-2) yr(-1) for TY and - 11.8 +/- 45.0 gCm(-2) yr(-1) for MD). The seasonal dynamics of carbon fluxes were significantly related to water availability at MD but more strongly related to air temperature at TY. During dry years, the controlling effect of water availability on carbon fluxes increased. Summer precipitation and soil moisture played key roles in the interannual variations in carbon fluxes in both grasslands. At MD, net carbon uptake was negatively related to summer air temperature likely because warming induced water deficit decreased photosynthesis. Greenness index derived from PhenoCam images captured key phenological phases and diverse magnitude of canopy dynamics. The index was correlated with seasonal and annual variations in carbon fluxes at both grasslands, suggesting the potential of PhenoCam for monitoring the spatial and temporal variations in canopy dynamics in different semiarid grasslands. (C) 2019 Elsevier B.V. All rights reserved.
英文关键词	Grassland Carbon flux Eddy covariance PhenoCam Moisture Temperature
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000462776800103
WOS关键词	ECOSYSTEM CO2 EXCHANGE ; INNER-MONGOLIA ; PRIMARY PRODUCTIVITY ; DIOXIDE FLUXES ; NEAR-SURFACE ; PRECIPITATION ; NET ; VARIABILITY ; STEPPE ; SEQUESTRATION
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
来源机构	中国科学院大气物理研究所 ; 北京林业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218684
作者单位	1.Chinese Acad Sci, Inst Atmospher Phys, Key Lab Reg Climate Environm Temperate East Asia, Beijing 100029, Peoples R China; 2.Univ Chinese Acad Sci, Beijing 101408, Peoples R China; 3.Beijing Forestry Univ, Coll Forestry, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Huichen,Jia, Gensuo,Wang, Hesong,et al. Seasonal and interannual variations in carbon fluxes in East Asia semi-arid grasslands[J]. 中国科学院大气物理研究所, 北京林业大学,2019,668:1128-1138.
APA	Zhao, Huichen,Jia, Gensuo,Wang, Hesong,Zhang, Anzhi,&Xu, Xiyan.(2019).Seasonal and interannual variations in carbon fluxes in East Asia semi-arid grasslands.SCIENCE OF THE TOTAL ENVIRONMENT,668,1128-1138.
MLA	Zhao, Huichen,et al."Seasonal and interannual variations in carbon fluxes in East Asia semi-arid grasslands".SCIENCE OF THE TOTAL ENVIRONMENT 668(2019):1128-1138.