An improved ET control method to determine the water-saving potential for farmland in Baiyangdian Watershed, China  

作　　者：Aiping PANG Chuihui LI Tao SUN Zhifeng YANG 

机构地区：[1]State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China [2]Key Laboratory for Water and Sediment Sciences (Ministry of Education), School of Environment, Beijing Normal University, Beijing 100875, China

出　　处：《Frontiers of Earth Science》2013年第2期151-158,共8页地球科学前沿（英文版）

基　　金：This research was supported by the National Basic Research Program of China （No. 2010CB951104）, the National Water Pollution Control and Treatment Project of China （No. 2008ZX07209-009）, and the Fund for Creative Research Groups of the National Natural Science Foundation of China （Grant No. 51121003）.

摘　　要：Resource-based water-saving potential has been recognized as the reduction of evapotranspiration and water loss of inefficient irrigation systems. In this paper, an improved evapotranspiration control model is applied to calculate resource-based water-saving potential, considering the influences of effective rainfall （uncontrolled evapotranspiration） and irrigated water （controlled evapotranspiration）. Farmland in Baiyangdian Watershed, a highly productive area in northern China, is analyzed to determine the water-saving potential of irrigation processes. The water-saving potential was zero, 163.90 × 10^6m3, and 318.24 × 10^6m3 in wet, normal, and dry years, respectively, and was greater in years with less rainfall. Under the combined effect of rainfall, crop water consumption, and crop water requirements, the water-saving potential showed obvious temporal and spatial variations. July and August comprised almost 98.6% of the annual potential. In the northeast and southwest corner of the study area, potential approached zero. The potential was 1.53 times greater in the north-central than in the south-central area. The model can furnish the appropriate timing and region to water managers for implementing water-saving strategies.Resource-based water-saving potential has been recognized as the reduction of evapotranspiration and water loss of inefficient irrigation systems. In this paper, an improved evapotranspiration control model is applied to calculate resource-based water-saving potential, considering the influences of effective rainfall （uncontrolled evapotranspiration） and irrigated water （controlled evapotranspiration）. Farmland in Baiyangdian Watershed, a highly productive area in northern China, is analyzed to determine the water-saving potential of irrigation processes. The water-saving potential was zero, 163.90 × 10^6m3, and 318.24 × 10^6m3 in wet, normal, and dry years, respectively, and was greater in years with less rainfall. Under the combined effect of rainfall, crop water consumption, and crop water requirements, the water-saving potential showed obvious temporal and spatial variations. July and August comprised almost 98.6% of the annual potential. In the northeast and southwest corner of the study area, potential approached zero. The potential was 1.53 times greater in the north-central than in the south-central area. The model can furnish the appropriate timing and region to water managers for implementing water-saving strategies.

关 键 词：resources-based water-saving potential EVAPOTRANSPIRATION improved evapotranspiration control model Baiyangdian Watershed 

分 类 号：S511[农业科学—作物学] X53[环境科学与工程—环境工程]