Journal
FRONTIERS OF EARTH SCIENCE
Volume 7, Issue 2, Pages 151-158Publisher
SPRINGER
DOI: 10.1007/s11707-013-0351-5
Keywords
resources-based water-saving potential; evapotranspiration; improved evapotranspiration control model; Baiyangdian Watershed
Categories
Funding
- National Basic Research Program of China [2010CB951104]
- National Water Pollution Control and Treatment Project of China [2008ZX07209-009]
- National Natural Science Foundation of China [51121003]
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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 x 10(6) m(3), and 318.24 x 10(6) m(3) 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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