The Study Of Ecology Value Change In Farming-Pastoral Region In Northern China

Content: The Horqin sandy land was a typical semiarid farming-pastoral area, which was an important part of ecologically fragile zone in the north of China. In recent years, as a result of the climate variation and humanity's unreasonable activity, the latent ecosystem desertification vulnerability of Horqin sand has transformed to the real environment disaster, seriously restricted development coordinating with the local society, the economical and ecological environment. Based on land utilization graphic data of the main region of Horqin sand in 1995 and 2000, this article apply the Chinese Land Ecosystem unit area service value table formulated by xie gaodi et al., which has presented ecosystem service function's definition, the connotation as well as the research development in home and abroad and studied the ecosystem service value and the environment effect which caused by land utilization change, taking Mapinfo and the SPSS software as the technical supporting method. The findings indicated:1,From 1995 to 2000,the cultivated land of Horqin sand increased 210628.38hm2, the amplification is 5.98%, other kinds showed decrease in different extent, the unused area reduced 145515.92 hm2, the weakening was 10.54% which was biggest, secondly the industry and mining and the resident land reduced 10737.24 hm2, the weakening was 3.40%, the forest land reduced 38414.36 hm2, the weakening was 2.24%, the water reduced 4208.18 hm2, the range was 1.49%, the wetland reduced 2251.33 hm2, the range was 0.73%, the lawn reduced 9503.55 hm2, the range was 0.13%.2,From 1995 to 2000, the ecology total value of the Horqin sand increased 1.35×108 Yuan from 1291.69×108 Yuan to 1293.04×108 Yuan, the amplification was 0.10%, increased 0.27×108 Yuan every year in average. The ecology service value's change scope was the same as the land utilization structure's change scope, also the ecological value of cultivated land obviously increased with the range as 5.97%; other kinds of ecological value assumed decrease in different degree, the ecology service value of unused land, forest land and water were more prominent, the range was 10.53%, 2.24%, 1.48% in turn; the lawn and the wetland had no obvious change, with the range as 0.13% and 0.73%, respectively.3,The ecological value of the cownty was greatly different from region to region in the research area. Its ecology service value assumed the declining trend which the lawn and the forest land for the farming, especially for Kezuohou banner, Aohan banner, Wengniiute banner and Linxi County. But the ecological value of the banner which transformed to the optimization land utilization type and the desertification was governed reasonably assumed to increaseing tendency, as the Zhalute banner (including Huolinguole).Therefore, in the research area which implements the returning of farmland to forest as well as grass and broadcasts reasonably are important measure in prevent the ecosystem desertification from expanding, to strengthen the ecosystem stability and the resistance ability, and was an efficient path to enhance ecosystem service function value in the farming-pastoral area of north, it was also the most important task of ecological engineering construction in this research area.