Analysis of the Variability of Canopy Resistance over a Desert Steppe Site in Inner Mongolia, China

ZHANG Guo; ZHOU Guangsheng; CHEN Fei; WANG Yu

首页> 中文期刊> 《大气科学进展：英文版》 >Analysis of the Variability of Canopy Resistance over a Desert Steppe Site in Inner Mongolia, China

Analysis of the Variability of Canopy Resistance over a Desert Steppe Site in Inner Mongolia, China

开具论文收录证明 >>

期刊封面封底目录下载 >>

文献代查 >>

页面导航

摘要
著录项
相关主题

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(Kp), 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 Kpdue to the small interannual variability in Kpduring 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.

著录项

来源
《大气科学进展：英文版》 |2014年第3期|681-692|共12页
作者
ZHANG Guo; ZHOU Guangsheng; CHEN Fei; WANG Yu;
展开▼
作者单位

Chinese Academy of Meteorological Sciences;

University of Chinese Academy of Sciences;

State Key Laboratory of Vegetation and Environmental Change Institute of Botany;

Chinese Academy of Sciences;

National Center for Atmospheric Research;

College of Forestry;

Henan University of Science and Technology;

展开▼
原文格式 PDF
正文语种 chi
中图分类草地学、草原学;
关键词
冠层阻力; 荒漠草原; 内蒙古; 网站; 中国; 土壤含水量; 叶面积指数; 异性;

Analysis of the Variability of Canopy Resistance over a Desert Steppe Site in Inner Mongolia, China

摘要

著录项

相关主题

期刊订阅