Ecological Restoration Of Land Desertification In Da’an City

Land desertification is one of the major global environmental problems facing humanity, land desertification area in West of Jilin province is 8355.30km2, account for 15.39% of the total area of western Jilin province land, it is our country north ecological fragile zone, and the ecological environment in Jilin province was the most severely damaged area. The desertification of land so that land degradation, land to the value decrease, economic variation, limits the coordinated development of urban and rural and regional economic level of ascension as a whole. After the 1980 s, the western Jilin province began to control desertification land, implementation of ecological engineering construction, adjusting the structure of land use, planting trees and grasses for windbreak and sand fixation, water conservation, the overall control of desertification land, especially desertification serious regional desertification speed reduced, desertification degree of ease. But in the face of area of sandy land still accounts for about 15% of the facts, control of desertification land has a long way to go, how to further control the desertification, change for the unused land into a land available, desertification land for good quality, is an important issue of the west still need to solve.In this paper, Da’An City of Jilin province as the research area, based on the technology of spatial analysis of GIS data, by means of field observation, experiment and indoor analysis and synthesis method, use the vegetation coverage, slope, soil depth and soil texture, and the weight of index method, the study area of sensitivity of desertification land area is divided into three grades: serious desertification, the moderate desertification and mild desertification. From the analysis result, Da’An City mild desertification land in the majority, accounting for 75% of the total, and in land use and good use structure spontaneously formed; moderate 23.6%, severe accounted for 1.4%, proportion is low, but the larger problem in use, and there are risks of continued to deteriorate. Accordingly, put forward three kinds of model of land desertification treatment in Da’An City and analyzed the ecological benefit:(1) Mild desertification using field of grass land use patterns, the economic and ecological benefits is better than no forest land, to effectively manage the desertification.(2) Moderate desertification land using two-step do ecological management, the first step, restore grassland, nutrient supplement with manure fertilizer, after reaching mild desertification standards, such as using field of grass land pattern.(3) Serious desertification land use biological control mode, first to carry out the plot test, application of organic carbon and biological fertilizer, obtain the plant growth and soil nutrient information, identification of its recovery time, to determine the severe desertification land back to mild to forest and grass field land use patterns of the time, in order to realize the orderly control of desertification land.