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干旱半干旱过渡带是生态环境变化的敏感和脆弱地带 ,气候的波动性和人口压力是生态脆弱的根本原因 ,干旱和半干旱区交界线在丰枯年份的空间摆动幅度最大达 1 1 0— 1 30km .水资源短缺是制约该区经济发展和生态环境改善的主要因素之一 ,有限的降水资源是生活和农业生产的主要水源 ,也是可以通过人为措施开发利用的水源 .集水技术操作简单 ,适应性强 ,费用低 ,开发潜力大 ,从事的生产领域广泛 ,采用这种技术可以建立新的农业生态系统并改善该区生态环境 .分析了干旱半干旱区过渡带降水的时空变异性 ,确定了 2 5 0mm降水量线在丰枯年份的空间摆动幅度 .通过野外径流观测试验 ,系统研究了雨水集流系统集流面的产流特征和集水效率、水质和集水的高效利用 ,并为脆弱区生态环境建设提出小流域微型生态雨水集流模式 .
The arid and semi-arid transitional zone is a sensitive and vulnerable area where ecological environment changes. The climate fluctuation and population pressure are the fundamental causes of ecological fragility. The spatial fluctuation range of the boundary between arid and semi-arid areas in Feng- The shortage of water resources is one of the main factors restricting the economic development and ecological environment improvement in this area. The limited precipitation resources are the main source of water for life and agricultural production and are also the water sources that can be exploited and exploited by manpower measures. , Adaptable, low cost, great development potential and extensive production area, this technology can be used to establish a new agroecosystem and improve the ecological environment in this area.The spatial and temporal variability of precipitation in the transitional arid and semiarid regions is analyzed, The space swing of 250 mm precipitation line was determined in the year of abundant and dry years.The field runoff observation experiment was used to systematically study the runoff characteristics and catchment efficiency of the catchment surface of the rainwater catchment system and the efficient use of water quality and catchment, And put forward the micro-ecological rainwater catchment model for the ecological environment construction in the fragile area.