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篇目详细内容 |
【篇名】 |
An improved ET control method to determine the water-saving potential for farmland in Baiyangdian Watershed, China |
【刊名】 |
Frontiers of Earth Science |
【刊名缩写】 |
Front. Earth Sci |
【ISSN】 |
2095-0195 |
【EISSN】 |
2095-0209 |
【DOI】 |
10.1007/s11707-013-0351-5 |
【出版社】 |
Higher Education Press and Springer-Verlag Berlin
Heidelberg |
【出版年】 |
2013 |
【卷期】 |
7
卷2期 |
【页码】 |
151-158
页,共
8
页 |
【作者】 |
Aiping PANG;
Chuihui LI;
Tao SUN;
Zhifeng YANG;
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【关键词】 |
resources-based water-saving potential; evapotranspiration; improved evapotranspiration control model; Baiyangdian Watershed |
【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 × 106?m3, and 318.24 × 106?m3 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. |
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