我国农业生产环境脆弱,水资源紧缺,现有耕地94970khm2,旱区约占60%,主要分布在日照长、温差大、富有农业生产潜力的北方和中西部地区。传统的耕作方式使土壤由于过度耕作而造成地表裸露,耕地退化,生态环境恶化。特别是近年来北方尘 China’s agricultural production environment is fragile and its water resources are scarce. The existing cultivated land is 94970khm2 and the arid area accounts for about 60%. The agricultural production is mainly distributed in the north and central and western regions with long sunshine, large temperature difference and rich agricultural production potential. The traditional farming methods make the soil bare due to over tillage, the degradation of cultivated land and the deterioration of ecological environment. Especially in recent years northern dust