Seasonal and interannual variation in water vapor and energy exchange over a typical steppe in Inner Mongolia, China

NWIPB OpenIR

	Seasonal and interannual variation in water vapor and energy exchange over a typical steppe in Inner Mongolia, China
	Hao, Yanbin ; Wang, Yanfen ; Huang, Xiangzhong ; Cui, Xiaoyong ; Zhou, Xiaoqi ; Wang, Shiping ; Niu, Haishan ; Jiang, Gaoming
	2007-09-11
发表期刊	AGRICULTURAL AND FOREST METEOROLOGY ; Hao Yanbin,Wang Yanfen, Huang Xiangzhong, Cui Xiaoyong,Zhou Xiaoqi,Wang Shiping, Niu Haishan, Jiang Gaoming. Seasonal and interannual variation in water vapor and energy exchange over a typical steppe in Inner Mongolia, China.AGRICULTURAL AND FOREST METEOROLOGY,2007,146(1-2): 57-69
摘要	In this study, we conducted eddy covariance (EC) measurements of water vapor exchange over a typical steppe in a semi-arid area of the Inner Mongolia Plateau, China. Measurement sites were located within a 25-year-old enclosure with a relatively low leaf area index (similar to 1. 5 m(2) m(-2)) and dominated by Leymus chinensis. Energy balance closure was (H + LE) = 17.09 + 0.69 x (Rn - G) (W/m(2); r(2) = 0.95, n = 6596). Precipitation during the two growing seasons of the study period was similar to the long-term average. The peak evapotranspiration in 2004 was 4 mm d(-1), and 3.5 mm d(-1) in 2003. The maximum latent heat flux was higher than the sensible heat flux, and the sensible heat flux dominated the energy budget at midday during the entire growing season in 2003; latent heat flux was the main consumption component for net radiation during the 2004 growing season. During periods of frozen soil in 2003 and 2004, the sensible heat flux was the primary consumption component for net radiation. The soil heat flux component was similar in 2003 and 2004. The decoupling coefficient (between 0.5 and 0.1) indicates that evapotranspiration was strongly controlled by saturation water vapor pressure deficit (VPD) in this grassland. The results of this research suggest that energy exchange and evapotranspiration were controlled by the phenology of the vegetation and soil water content. In addition, the amount and frequency of rainfall significantly affect energy exchange and evapotranspiration upon the Inner Mongolia plateau. (c) 2007 Published by Elsevier B.V.; In this study, we conducted eddy covariance (EC) measurements of water vapor exchange over a typical steppe in a semi-arid area of the Inner Mongolia Plateau, China. Measurement sites were located within a 25-year-old enclosure with a relatively low leaf area index (similar to 1. 5 m(2) m(-2)) and dominated by Leymus chinensis. Energy balance closure was (H + LE) = 17.09 + 0.69 x (Rn - G) (W/m(2); r(2) = 0.95, n = 6596). Precipitation during the two growing seasons of the study period was similar to the long-term average. The peak evapotranspiration in 2004 was 4 mm d(-1), and 3.5 mm d(-1) in 2003. The maximum latent heat flux was higher than the sensible heat flux, and the sensible heat flux dominated the energy budget at midday during the entire growing season in 2003; latent heat flux was the main consumption component for net radiation during the 2004 growing season. During periods of frozen soil in 2003 and 2004, the sensible heat flux was the primary consumption component for net radiation. The soil heat flux component was similar in 2003 and 2004. The decoupling coefficient (between 0.5 and 0.1) indicates that evapotranspiration was strongly controlled by saturation water vapor pressure deficit (VPD) in this grassland. The results of this research suggest that energy exchange and evapotranspiration were controlled by the phenology of the vegetation and soil water content. In addition, the amount and frequency of rainfall significantly affect energy exchange and evapotranspiration upon the Inner Mongolia plateau. (c) 2007 Published by Elsevier B.V.
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/50730
专题	中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Hao, Yanbin,Wang, Yanfen,Huang, Xiangzhong,et al. Seasonal and interannual variation in water vapor and energy exchange over a typical steppe in Inner Mongolia, China[J]. AGRICULTURAL AND FOREST METEOROLOGY, Hao Yanbin,Wang Yanfen, Huang Xiangzhong, Cui Xiaoyong,Zhou Xiaoqi,Wang Shiping, Niu Haishan, Jiang Gaoming. Seasonal and interannual variation in water vapor and energy exchange over a typical steppe in Inner Mongolia, China.AGRICULTURAL AND FOREST METEOROLOGY,2007,146(1-2): 57-69,2007.
APA	Hao, Yanbin.,Wang, Yanfen.,Huang, Xiangzhong.,Cui, Xiaoyong.,Zhou, Xiaoqi.,...&Jiang, Gaoming.(2007).Seasonal and interannual variation in water vapor and energy exchange over a typical steppe in Inner Mongolia, China.AGRICULTURAL AND FOREST METEOROLOGY.
MLA	Hao, Yanbin,et al."Seasonal and interannual variation in water vapor and energy exchange over a typical steppe in Inner Mongolia, China".AGRICULTURAL AND FOREST METEOROLOGY (2007).