中文摘要：

根据沽源县生态脆弱的实际情况,尊重自然地域分异规律,按照生态优先的原则,综合考虑经济、社会和生态效益,选取一个最能体现沽源县土地资源特点和社会发展要求的土地生态系统服务价值作为农业土地利用结构优化的主导目标,采用线性规划和灰色动态系统方法,建立目标函数,并将其它效益作为约束条件,得到了2015年农业土地利用结构优化宏观方案。研究表明,在多年平均降水量约400mm的北方农牧交错带中段,耕地面积不宜超过土地总面积的25%,牧草地面积占土地总面积的比例约40%,不宜片面强调过多发展林地面积。

英文摘要：

Ecological environment is fragile in Guyuan County.Complying with the rule of regional differentiation and the principle of ecological priority,taking into account the economic,social and ecological benefit,the largest land ecosystem service value was taken as the main goal of optimal structure of agricultural land use.The land ecosystem service value is the best embodiment of the characteristics of the agricultural land resources and social development demand in the county.Using linear programming and grey system methods,taking other benefits as the constraints,the optimum program of agricultural land use structure in 2015 was obtained.The result shows,in the middle of north farming-pastoral ecotone where rainfall is less than 400mm,the ratio of farmland area to total land area should not be more than 25%;while the ratio of grassland area to total land area is about 40%.It should not be too one-sided emphasis on the development of woodland.