中文摘要：

以甘肃省靖远县永新乡为研究区,通过农户调查获取资料,运用线性规划方法对干旱区生态-经济结构进行分析,寻求有效保护生态环境和增加农业产值的途径.当地调整农业种植结构的潜力很大,调整农业种植结构不仅能保证退耕不减收,而且还会有一定的增收;在调整种植结构的前提下,通过退耕还林还草和荒山禁牧,可有效增加干旱地区的植被盖度;在当地压砂田可显著提高农业产值,砂田种植糜子经济效益最高,而种植扁豆效益最低.

英文摘要：

Sustainable development of agriculture in arid areas is the academic community＇ s wide concern in the domestic and foreign. How can not only effectively protect the ecological environment, but also to increase agri- cultural output？ The study makes an analysis to Yongxin Township, Jingyuan County, Gansu Province, for exam- ple. The adjustment of agricultural planting structure has great potential in the area, which will not only ensure that the farmland not be reduced, but also increase the output value. The vegetation cover of arid zone can be effectively increased by conversion of cropland to forest and grasslands and banning grazing in the promise of adjusting the planting structure. Laying sandy land can significantly increase agricultural output in the local. Cultivation of Pani- eum miliaceum millet is most effective in the sandy land.