延安农林牧土地结构阶段优化模式研究

Optimizing two land use structures by linear programming in Yan'an region.

利用线性规划方法对黄土丘陵区农林牧用地结构进行优化模式设计,以最大收入为目标函数,在生态、社会效益需求的约束下优化用地结构,非生产用地、农地、林地和牧草地分别为13％、18％、32％和37％;并对有政府补贴的退耕还林(草)的2005年阶段进行模型选优,该阶段用地结构为18％、13％、34%和35%,按这2个优化模式运行其生态、社会和经济效益均显著增长,这对西北生态农业建设有重要指导意义。

By using linear programming methods, the authors propose that the optimal land use structure with non-product land, agricultural land, forestry land, pasture land is 13% , 18% , 32% and 37% respectively. With the optimal land use structure, the ecological, economic and social outcomes can be mated well. Considering that the eco-agriculture campaign can he phased, the authors had worked out the 2005-year's linear programmed land use structure in which non-producl land, agricultural land, forestry land, pasture land are 18% , 13% , 34% and 35% of the total land area respectively. The 2005-year's land use model also has significant increase of eco-economic and social profits. The two land use structures can be extended in Loess Hill Region to advance the eco-agriculture construction in northwest China.