干旱区生态环境知识资源中心(Arid): Analysis of the Variability of Canopy Resistance over a Desert Steppe Site in Inner Mongolia, China

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	Analysis of the Variability of Canopy Resistance over a Desert Steppe Site in Inner Mongolia, China
	Zhang Guo; Zhou Guangsheng; Chen Fei; Wang Yu
来源期刊	Advances in Atmospheric Sciences
ISSN	0256-1530
出版年	2014
卷号	31 期号:3 页码:681-692
英文摘要	Canopy resistance substantially affects the partitioning of available energy over vegetated surfaces. This study analyzed the variability of canopy resistance and associated driving environmental factors over a desert steppe site in Inner Mongolia, China, through the use of eddy-flux and meteorological data collected from 2008 to 2010. Distinct seasonal and interannual variabilities in canopy resistance were identified within those three years, and these variabilities were controlled primarily by precipitation. Strong interannual variability was found in vapor pressure deficit (VPD), similar to that of air temperature. Based on the principal component regression method, the analysis of the relative contribution of five major environmental factors [soil-water content (SWC), leaf-area index (LAI), photosynthetically active radiation (K_p), VPD, and air temperature] to canopy resistance showed that the canopy-resistance variation was most responsive to SWC (with > 35% contribution), followed by LAI, especially for water-stressed soil conditions (> 20% influence), and VPD (consistently with an influence of approximately 20%). Canopy-resistance variations did not respond to K_p due to the small interannual variability in K_p during the three years. These analyses were used to develop a new exponential function of water stress for the widely used Jarvis scheme, which substantially improved the calculation of canopy resistance and latent heat fluxes, especially for moist and wet soils, and effectively reduced the high bias in evaporation estimated by the original Jarvis scheme. This study highlighted the important control of canopy resistance on plant evaporation and growth for the investigated desert steppe site with a relatively low LAI.
英文关键词	variability canopy resistance desert steppe site principal component regression
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Science & Technology - Other Topics
CSCD记录号	CSCD:5103122
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335338
作者单位	Zhang Guo, Chinese Academy of Meteorological Sciences, Beijing 100081, China.; Zhou Guangsheng, Chinese Academy of Meteorological Sciences, State Key Laboratory of Vegetation and Environmental Change, Beijing 100081, China.; Chen Fei, National Center for Atmospheric Research, Boulder, 80302, USA.; Wang Yu, College of Forestry, Henan University of Science and Technology, Luoyang, Henan 471003, China.
推荐引用方式 GB/T 7714	Zhang Guo,Zhou Guangsheng,Chen Fei,et al. Analysis of the Variability of Canopy Resistance over a Desert Steppe Site in Inner Mongolia, China[J],2014,31(3):681-692.
APA	Zhang Guo,Zhou Guangsheng,Chen Fei,&Wang Yu.(2014).Analysis of the Variability of Canopy Resistance over a Desert Steppe Site in Inner Mongolia, China.Advances in Atmospheric Sciences,31(3),681-692.
MLA	Zhang Guo,et al."Analysis of the Variability of Canopy Resistance over a Desert Steppe Site in Inner Mongolia, China".Advances in Atmospheric Sciences 31.3(2014):681-692.