气候变化领域集成服务门户(CCPortal): Alpine wetland ecosystem carbon sink and its controls at the Qinghai Lake

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DOI	10.1007/s12665-017-6529-5
	Alpine wetland ecosystem carbon sink and its controls at the Qinghai Lake
	Cao, Shengkui; Cao, Guangchao; Feng, Qi; Han, Guangzhao; Lin, Yangyang; Yuan, Jie; Wu, Fangtao; Cheng, Shuyan
发表日期	2017
ISSN	1866-6280
EISSN	1866-6299
卷号	76 期号:5
英文摘要	Wetland ecosystems play an important role in regulating the Earth's climate. This paper presents the results of a study on the alpine wetland ecosystem CO2 fluxes at the Qinghai Lake at different vegetative development stages and CO2 controlling factors measured by eddy covariance system. The results showed that the alpine wetland ecosystem at the Qinghai Lake area was a carbon sink on the whole year basis. The average net ecosystem CO2 exchange (NEE) amount was -904.42 g CO2/m(2); the average amount of the ecosystem reparation (Re) was 1450 g CO2/m(2); the average gross primary productivity (GPP) was 2354.42 g CO2/m(2) from July 2011 to June 2013 year. The NEE, Re and GPP amounts were the maximum during the growing stage of the whole year. There were significant negative linear correlations between monthly NEE amount and monthly average total solar radiation (SR) (R-2 = 0.27, p < 0.05), incident photosynthetically active radiation (PAR) (R-2 = 0.28, p < 0.05), ambient vapor pressure deficit (VPD) (R-2 = 0.38, p< 0.01), monthly total precipitation (P) (R-2 = 0.65, p< 0.0001), monthly mean leaf area index (LAI) (R-2 = 0.85, p< 0.0001) and enhanced vegetation index (EVI) (R-2 = 0.84, p< 0.0001). Extreme significant polynomial nonlinear negative correlations were found between NEE amounts and monthly average air temperature (T-a) (R-2 = 0.84, p< 0.0001), soil temperature at 0-5 cm depth (T-s) (R-2 = 0.90, p< 0.0001) and air relative humidity (RH) (R-2 = 0.76, p< 0.0001). The monthly Re amount of alpine wetland ecosystem at the Qinghai Lake at different stages showed significant nonlinear positive correlations with all the identified affecting factors except for monthly mean EVI, which showed a linear relationship ( R-2 = 0.72, p< 0.0001). The monthly GPP amount at different vegetative development stages showed a significant exponential correlation with monthly average T-a (R-2 = 0.92, p< 0.0001), a power function with VPD (R-2 = 0.24, p< 0.05), quadratic polynomial ones with monthly average T-s (R-2 = 0.93, p< 0.0001), RH (R-2 = 0.74, p< 0.0001) and monthly P (R-2 = 0.55, p< 0.05). Extremely significant linear correlations of the monthly GPP amount at different developing stages with monthly average LAI (R-2 = 0.85, p< 0.0001) and EVI (R-2 = 0.92, p< 0.0001) were also found.
关键词	Alpine wetland ecosystem Net ecosystem CO2 exchange (NEE)Ecosystem respiration (Re)Gross primary productivity (GPP)Carbon source/sink Qinghai Lake
学科领域	Environmental Sciences & Ecology; Geology; Water Resources
语种	英语
WOS研究方向	Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources
来源期刊	ENVIRONMENTAL EARTH SCIENCES
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/111933
作者单位	Chinese Acad Sci, Res Inst, Cold & Arid Regions Environm & Engn, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Cao, Shengkui,Cao, Guangchao,Feng, Qi,et al. Alpine wetland ecosystem carbon sink and its controls at the Qinghai Lake[J]. 中国科学院西北生态环境资源研究院,2017,76(5).
APA	Cao, Shengkui.,Cao, Guangchao.,Feng, Qi.,Han, Guangzhao.,Lin, Yangyang.,...&Cheng, Shuyan.(2017).Alpine wetland ecosystem carbon sink and its controls at the Qinghai Lake.ENVIRONMENTAL EARTH SCIENCES,76(5).
MLA	Cao, Shengkui,et al."Alpine wetland ecosystem carbon sink and its controls at the Qinghai Lake".ENVIRONMENTAL EARTH SCIENCES 76.5(2017).