Study on Water Use and It’s Saving Potential for Cropping Systems in the Suburb of Beijing--Case Study in Shunyi County
|School||China Agricultural University|
|Course||Crop Cultivation and Farming System|
|Keywords||Beijing suburbs Farming system Water use efficiency Water-saving potential|
In this study, by positioning test and typical survey, conducted a preliminary study of water use efficiency and water-saving potential of Shunyi District, farming systems, designed to provide the basic parameters of water-saving farming systems for the suburb evidence and theoretical support for Beijing agricultural water-saving research reference. In this study, the first three levels from the regional level, the level of farming systems and crop level water supply and demand balance. Shunyi District, the annual total available water resources of 296 million m to 3, and the annual water demand of 381 million m to over-exploitation of groundwater about 085 million m to 3 a year. Farming system annual water consumption of about 1.9 to 2.2 billion m to 3. The 1995 to farming system water supply shortfall of about 10 million m to 3. Balanced analysis of field crops need water and natural precipitation, Shunyi District, the major field crops can be divided into three categories: 1) irrigation demand for larger crops, including rice, wheat, alfalfa, cotton; 2) irrigation demand smaller crops, including summer-sown crops (maize, peanuts summer, summer soybean) and drought-tolerant, drought escape crops (sorghum, millet); 3) intermediate crops, including most of the spring crop (corn, spring peanut The spring soybean). This study through field crop moisture test, the fixed-point observation of fruits and vegetables in water test to determine the actual water consumption, Shunyi District, the major field crops, fruit trees, open field vegetables and facilities vegetables whole growth stage of actual water consumption, irrigation water, economic production basic water use parameters, based on further analysis of the actual crop water regulation and water and economic production relations, the last comprehensive analysis parameters there are more differences in water use, crop specific performance: 1) the actual water consumption differences in 2003 water consumption for pear 750.2mm smallest facilities watermelon 266.5mm; 2) water use efficiency (WUE) difference, field crops, alfalfa (20.9 ~ 21.2kg/hm ~ 2.mm), large in general for economic production to grain field crops (5.3 ~ 13.9kg/hm ~ 2.mm); fruit (51.5kg / ~ 67.51kg/hm 2.mm) is much larger than the field crops; vegetables crop water use efficiency (WUE) larger scope of the changes, the biggest cabbage 204.4kg/hm ~ 2.mm, the smallest common bean of as 28.8kg/hm to 2.mm, other crops in 100kg/hm ~ 2.mm. Paper a preliminary study of the water-saving potential of the farming system that: 1) reduce excess irrigation water, can save the water resources of 0.4 to 0.5 billion m 3; 2) non-full irrigation techniques can save about 10 percent of the irrigation water; 3) improved irrigation engineering, irrigation water savings of about 10%.