Sensitivity of Temperate Desert Steppe Carbon Exchange to Seasonal Droughts and Precipitation Variations in Inner Mongolia, China

doi:10.1371/journal.pone.0055418

	Sensitivity of Temperate Desert Steppe Carbon Exchange to Seasonal Droughts and Precipitation Variations in Inner Mongolia, China
	Yang, Fulin 1; Zhou, Guangsheng 1,2
	2013
发表期刊	PLOS ONE
ISSN	1932-6203
卷号	8 期号:2
摘要	Arid grassland ecosystems have significant interannual variation in carbon exchange; however, it is unclear how environmental factors influence carbon exchange in different hydrological years. In this study, the eddy covariance technique was used to investigate the seasonal and interannual variability of CO2 flux over a temperate desert steppe in Inner Mongolia, China from 2008 to 2010. The amounts and times of precipitation varied significantly throughout the study period. The precipitation in 2009 (186.4 mm) was close to the long-term average (183.9 +/- 47.6 mm), while the precipitation in 2008 (136.3 mm) and 2010 (141.3 mm) was approximately a quarter below the long-term average. The temperate desert steppe showed carbon neutrality for atmospheric CO2 throughout the study period, with a net ecosystem carbon dioxide exchange (NEE) of -7.2, -22.9, and 26.0 g C m(-2) yr(-1) in 2008, 2009, and 2010, not significantly different from zero. The ecosystem gained more carbon in 2009 compared to other two relatively dry years, while there was significant difference in carbon uptake between 2008 and 2010, although both years recorded similar annual precipitation. The results suggest that summer precipitation is a key factor determining annual NEE. The apparent quantum yield and saturation value of NEE (NEEsat) and the temperature sensitivity coefficient of ecosystem respiration (R-eco) exhibited significant variations. The values of NEEsat were -2.6, -2.9, and -1.4 mu mol CO2 m(-2) s(-1) in 2008, 2009, and 2010, respectively. Drought suppressed both the gross primary production (GPP) and R-eco, and the drought sensitivity of GPP was greater than that of R-eco. The soil water content sensitivity of GPP was high during the dry year of 2008 with limited soil moisture availability. Our results suggest the carbon balance of this temperate desert steppe was not only sensitive to total annual precipitation, but also to its seasonal distribution.
学科领域	Multidisciplinary Sciences
DOI	10.1371/journal.pone.0055418
收录类别	SCI
语种	英语
WOS关键词	NET ECOSYSTEM EXCHANGE ; GAP FILLING STRATEGIES ; SOIL CO2 FLUX ; DIOXIDE EXCHANGE ; INTERANNUAL VARIABILITY ; PRIMARY PRODUCTIVITY ; ANNUAL GRASSLAND ; RESPIRATION ; WATER ; HEAT
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000314692800030
出版者	PUBLIC LIBRARY SCIENCE
文献子类	Article
出版地	SAN FRANCISCO
资助机构	National Basic Research Program of China(National Basic Research Program of China) ; National Natural Science Foundation of China(National Natural Science Foundation of China (NSFC)) ; China Postdoctoral Science Foundation(China Postdoctoral Science Foundation) ; Natural Science Foundation of Gansu Province
作者邮箱	郭, 青霞/GZH-2618-2022
作品OA属性	Green Accepted, Green Published, gold, Green Submitted
引用统计	被引频次：26[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/2S10CLM1/27835
专题	植被与环境变化国家重点实验室
作者单位	1.CMA, Key Lab Arid Climat Change & Reducing Disaster Ga, Key Open Lab Arid Climat Change & Disaster Reduct, Inst Arid Meteorol, Lanzhou, Peoples R China 2.Chinese Acad Sci, State Key Lab Vegetat & Environm Change, Inst Bot, Beijing, Peoples R China 3.Chinese Acad Meteorol Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Yang, Fulin,Zhou, Guangsheng. Sensitivity of Temperate Desert Steppe Carbon Exchange to Seasonal Droughts and Precipitation Variations in Inner Mongolia, China[J]. PLOS ONE,2013,8(2).
APA	Yang, Fulin,&Zhou, Guangsheng.(2013).Sensitivity of Temperate Desert Steppe Carbon Exchange to Seasonal Droughts and Precipitation Variations in Inner Mongolia, China.PLOS ONE,8(2).
MLA	Yang, Fulin,et al."Sensitivity of Temperate Desert Steppe Carbon Exchange to Seasonal Droughts and Precipitation Variations in Inner Mongolia, China".PLOS ONE 8.2(2013).

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