SAFETY ANALYSIS OF WATER RESOURCES AND ECG-ENVIRONMENT IN SHIYANG RIVER BASIN
The research on the present situation of soil and water development and utilization in Shiyang River Basin shows that water resources and eco-environment situation in this area are near the edge of collapse. Since the water crises occurred in the 1970s, problems caused by continuous decrease of water resources have been becoming serious year by year and eco-environment crisis occurred as a consequence. Up to now, 10 380ha of irrigated lands have been abandoned due to sand coverage and water shortage in the basin. Ground water was over exploded in Wuwei and Minqin because of water shortage. Ground water table in many places dropped under 5m (which is the ecology water table level), thus about 3000ha ofElaeagnus angustifolia forest come to dead and another 5800ha become feeble, and wind-driff sand near the oasis become alive. According to the current situation, if water utilization scope was not enlarged, a water transfer volume of 600×106m3/a from other areas will be suitable to keep water resources and eco-environment safety in the basin, and also 70× 106m3/a will be left as spare water. Under this condition the water resources and eco-environment of the basin can reach the critical safety line of 2.032× 109m3/a; or if 180× 106m3 of water can be transferred from other areas, the water resources can reach the safety warning line of 1.732× 109m3/a.
作 者： ZHANG Ji-shi ZHANG Yong-qiu PU Rui-feng CHEN Ren-sheng CHENG Zhong-shan WANG Ming-quan 作者单位： ZHANG Ji-shi(Environment Department,Lanzhou Jiaotong University,Lanzhou 730070,P. R. China;Cold and A rid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,P. R. China)ZHANG Yong-qiu,CHENG Zhong-shan,WANG Ming-quan(Environment Department,Lanzhou Jiaotong University,Lanzhou 730070,P. R. China)
PU Rui-feng,CHEN Ren-sheng(Cold and A rid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,P. R. China)
刊 名： 中国地理科学（英文版） SCI 英文刊名： CHINESE GEOGRAPHICAL SCIENCE 年，卷(期)： 2005 15(3) 分类号： P641.8 关键词： water resources water resources safety Shiyang River Basin