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《Arid Land Geography》 2004-02
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Problems of Water Resources and the Measures for the Regulation of Planting Structure in the Weibei Rainfed Highland,Shaanxi Province

SONG Xiao-yu 1,2 ,LIU Xian-zhao 3,SHEN Bing 1,SHI Wen-juan 1 (1 Institute of Water Resources Research,Xi'an University of Science and Engineering,Xi'an 710048,China;2 Northwest University of Agricultural and Forestry Science and Technology,Yangling 712100,China;3 Department of Geography,Yantai Normal College,Yantai 264025,China)  
Located in the hinterland of the Loess Plateau in northwest China,the Weibei Rainfed Highland with a total area of 3.0×10 4 km 2 is a main producing area of winter wheat in Shaanxi Province,is also a mesoyield and low-yield region,and the per unit area yield of winter wheat is about 1500 kg/hm 2. The highland belongs to a warm-temperate semi-humid area where droughts occur frequently,the annual precipitation varies in a range of 420~700 mm,the temporal and spatial distribution of precipitation is uneven and does oot accord with the requirement of irrigating winter wheat. Moreover,the evaporation here is high,the moisture in the wheat fields is deficient,and the increase of wheat yield in the Weibei Rainfed Highland is restricted. Since the 1908's,the partial traditional growing of cereals has been replaced by planting fruit trees in large areas in the Weibei Rainfed Highland because the fruit yield and its economic returns are high. The contradiction between the water consumption and the water resources in the highland becomes more serious due to the regulation of planting structure. In this paper,the existing problems in the utilization of water resources, which are caused by the regulation of planting structure in the highland,are analyzed. It is considered that the regulation of the planting structure must be based on the water resources in this region. Therefore,some measures are put forward,which are to scientifically and rationally utilize water resources,store rainwater,save water resources,and breed the drought-resistant varieties of crops.
【Fund】: 国家自然科学基金 (5 0 2 0 90 16);; 陕西省自然科学基金 (2 0 0 3D13 );; 西安理工大学高学历人员科研启动基金
【CateGory Index】: TV213
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