多年来 ,围绕日益严重的西北生态环境建设问题 ,农、林、牧、水各业开展了一系列相关研究 ,涌现出“径流林业”、“集流整地”、“雨水集流”、“节水农业”等一大批先进实用技术 ,启动了如“三北”防护林体系建设、防沙治沙、小流域综合整治等一系列重大工程和项目。但由于自 Over the years, focusing on the increasingly serious problem of ecological environment construction in Northwest China, a series of related researches have been carried out in agriculture, forestry, animal husbandry and water industries, and emerged such as “runoff forestry”, “gathering and land preparation”, “rainwater harvesting” and “ Water and agriculture ”and a large number of advanced and practical technologies. A series of major projects and projects such as the construction of the“ Three Norths ”shelterbelt system, the prevention and control of desertification and the comprehensive improvement of small watersheds have been launched. But since