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长城沿线风沙地是由种植农作物和饲养家畜结合在一起的农牧业生产系统。在进行生产的过程中，常因生产系统的紊乱而导致土地生产力下降和生态环境恶化。为了探讨这一地区土地资源的合理配制，组建有序的生产结构，达到土地持续利用的目的，于１９９０～１９９４ 年在陕西靖边长城沿线选择１１０．６ ｈｍ ２ 的风沙地，设置了４个区进行了专门的研究。结果表明，在作物和牲畜两者结合在一起的农业生产系统中，当牧业收入占种植业和饲养业总收入５０％ 左右时，其经济效益最高，可使总收入增加４１．９８％ ，土壤有机质增加３０％ 以上，从而增强了农业生产的稳定性和土地的持续生产力
Windy sand along the Great Wall is a farming and animal husbandry production system that integrates the cultivation of crops and the raising of livestock. In the process of production, land productivity and deterioration of the ecological environment are often caused by the disorder of the production system. In order to explore the reasonable formulation of land resources in this region and establish an orderly production structure to achieve the purpose of sustainable land use, we selected 110.6 hm 2 wind-blown sand land along the Great Wall of Jingbian in Shaanxi Province from 1990 to 1994 and set up 4 District conducted a special study. The results show that in the agricultural production system where both crop and livestock are combined, the highest economic benefit when animal husbandry income accounts for about 50% of the total income of planting and breeding industry can increase the total income by 41.98% Soil organic matter increases by more than 30%, thereby enhancing the stability of agricultural production and the sustainable productivity of the land