干旱区生态环境知识资源中心(Arid): Microclimate and CO_2 fluxes on continuous fine days in the Xihu desert wetland,China

Arid

	Microclimate and CO_2 fluxes on continuous fine days in the Xihu desert wetland,China
	Gou Qianqian; Qu Jianjun; Han Zhiwen
来源期刊	Journal of Arid Land
ISSN	1674-6767
出版年	2015
卷号	7 期号:3 页码:318-327
英文摘要	The Xihu desert wetland is located in an extremely arid area in Dunhuang,Gansu province of Northwest China.The area is home to an unusual geographic and ecological environment that is considered unique,both in China and the world.Microclimate is not only related to topography,but is also affected by the physical properties of underlying ground surfaces.Microclimate and CO_2 flux have different characteristics under different underlying surface conditions.However,until now,few studies have investigated the microclimate characteristics and CO_2 flux in this area.The eddy covariance technique(ECT) is a widely used and effective method for studying such factors in different ecosystems.Basing on data from continuous fine days obtained in the Dunhuang Xihu desert wetland between September 2012 and September 2013,this paper discussed and compared the characteristics of daily microclimate variations and CO_2 fluxes between the two periods.Results from both years showed that there was a level of turbulent mixing and updraft in the area,and that the turbulent momentum flux was controlled by wind shear under good weather conditions.The horizontal wind velocity,friction wind velocity and vertical wind velocity were commendably consistent with each other.Air temperature in the surface layer followed an initial decreasing trend,followed by an increasing then decreasing trend under similar net radiation conditions.With changes in air temperature,the soil temperature in the surface layer follows a more obvious sinusoidal fluctuation than that in the subsoil.Components of ground surface radiation during the two study periods showed typical diurnal variations.The maximum diurnal absorption of CO_2 occurred at around 11:00(Beijing time) in the Xihu desert wetland,and the concentrations of CO_2 in both periods gradually decreased with time.This area was therefore considered to act as a carbon sink during the two observation periods.
英文关键词	eddy covariance microclimate characteristics CO_2 flux extremely arid region desert wetland Dunhuang
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:5385821
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335461
作者单位	Gou Qianqian, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Key Laboratory of Desert and Desertification, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.; Qu Jianjun, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Key Laboratory of Desert and Desertification, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.; Han Zhiwen, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Key Laboratory of Desert and Desertification, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.
推荐引用方式 GB/T 7714	Gou Qianqian,Qu Jianjun,Han Zhiwen. Microclimate and CO_2 fluxes on continuous fine days in the Xihu desert wetland,China[J],2015,7(3):318-327.
APA	Gou Qianqian,Qu Jianjun,&Han Zhiwen.(2015).Microclimate and CO_2 fluxes on continuous fine days in the Xihu desert wetland,China.Journal of Arid Land,7(3),318-327.
MLA	Gou Qianqian,et al."Microclimate and CO_2 fluxes on continuous fine days in the Xihu desert wetland,China".Journal of Arid Land 7.3(2015):318-327.