Comprehensive Evaluation of Land Use Ecosystem Service Value in Beijing

A comprehensive evaluation of land use ecosystem service value is brought out.Based on the evaluation,the land classification of ecological function importance is explored.Firstly,the main land use types in Beijing are determined with 9 first types and 15 sub-types,then the basic ecosystem service value of each type is determined.Secondly,the factors including natural,location and humanistic conditions are chosen to evaluate the ecological environment and divide Beijing into 4 ecological zones.Thirdly,the land use ecosystem service value is corrected by the ecological environment indexes of each ecological zone and the land classification of ecological function importance is figured out with the clustering method by their ecosystem service value.In the end,the comprehensive evaluation method is applied to the current land utilization maps of Beijing in 1993,2001 and 2007,and the distribution maps of ecosystem service value in per unit area and land classification of ecological function importance are obtained,so the changing situation of ecosystem service value and each type of land classification of ecological function importance in Beijing are analyzed according to the result.It shows that,the total ecosystem service value of Beijing decreases from 1993 to 2007 and that of ecological zone decreases except one zone.The grade of land classification of ecological function importance is decreasing from central city to suburb and the grade in northwest is higher than that of southeast.The area of the first class,the second class and the sixth class increases,while the area of the third class,the fourth class and the fifth class decreases from 1993 to 2007.