关键词: 通径系数, 通径系数

Abstract: In recent years there were severe variations in land use of Ejina Oasis. Studies on the variation state of its ecosystem service value could supply scientific basis for protection and restoration of regional eco-environment. Based on the land-used basic data from 1987, 1999, 2008, combined with the research area’s actual situation, revised the values per unit area of ecosystem services in China, the effects of land use change on ecosystem service values and functions of Ejina Oasis in 1987-2009 were analyzed. The results showed that: the ecosystem service values had a changing trend of first decrease and then increased during 1987-2009. The total value of ecosystem services decreased from 79.32×108 Yuan in 1987 to 75.52×108 Yuan, then increased to 78.14×108 Yuan in 2009. Area change of forest, grass land, crop land, water body, desert and its’ values had been changed very similarity. This indicated different land use area change was the key influence factors of ecosystem service values variation in Ejina. Comparison analyzed on the ratio of land use change and the ratio of values contributions, forest, grass land and water body contributed 95% values by 10% area. This proved its’ tremendous effect on ecosystem service values. For the various land use patterns, the coefficients of sensitivity of their ecosystem service value were all less than 1, which indicated that the changes in the value of ecosystem was lack of flexibility.