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

By using linear programming methods，the authors propose that the optimal land use structure with non-prod-uct 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 wel1．Considering that the eco-agriculture campaign can be phased，the authors had worked out the 2005-year’s linear programmed land use structure in which nonproduct land，agricultural land，forestry land，pasture land are 18％ ，13％ ，34％ and 35％ of the total land area respeetively 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 Hil1 Region to advance the eco-agriculture construction in northwest China.