半干旱地区的农业与社会发展是个全球性难题。世界上一些最不发达的国家多半分布在这一区域。水分不足是制约这一区域农业生产发展的主要因素,加之伴随产生的荒漠化、水土流失、土壤盐渍化和土壤肥力衰退等问题,使这一区域农业依存的自然资源和环境不断恶化。 Agriculture and social development in semi-arid areas are a global problem. Some of the world’s most underdeveloped countries are mostly located in the region. Water shortage is a major factor restricting the development of agricultural production in this region. Coupled with such problems as desertification, soil erosion, soil salinization and decline of soil fertility, the natural resources and environment for agricultural dependence in this region are deteriorating.