Last Three Decades Haloxylon Forest Degradation Process Of Ganjiahu Nature Reserve In Xinjiang

Based on the data statistics and analysis, field investigation method to MSS,1975,1991,1975Land-satTM/ETM images as data sources, using ERDASIMAGINE and Arc GIS interpretation, analysis, and USES the1:100000to pographicmap as a secondary data in the study area. According to the ecological environment inthe study area actual situation, the land use type is classified as forest land, grassland,desert sand and four types of cultivated land.Through nearly thirty years in xinjiangGanGuHu national nature reserve Haloxylon forest degradation dynamic changeprocess of research, extraction of landscape patch information, statistics of varioustypes of landscape patch area. Research conclusions are as follows:1. Landscape structure Haloxylon forest landscape types in the dominant degreeis big, statistical Gan Jia Hu Haloxylon forest area of31705.58hectares to30056.99in1991from1975hectares in2007to27881.39hectare than eight, there was adecrease in the ninetys, should attach importance to forest conservation andsustainable development. Haloxylon forest plaque area percentage by57.99Percentage to51Percentage decrease year by year, and the area of cultivated land,sand desert and grassland was increased from41.98Percentage in1975to48.96Percentage in2007. Landscape diversity index Haloxylon forest reduced from0.76to0.76and gobi sand increased from0.13to0.13, diversity of grassland, cultivated landis increasing at the same time; Haloxylon forest dominance is on the decline since1975, Haloxylon forest patch richness density reduced from32.79to32.79, the grassrichness density by47.1to47.1, sand desert by34.18to38.31is relatively high;Haloxylon forest separation degree index is15.78to10.74,19.72to6.84, the grasswas decreased year by year; Haloxylon forest fragmentation index and isolation indexgradually increases from2.63to2.63, in line with other types of index change;overall trend Haloxylon forest reserve cultivated land to grassland and gobi and sand.1975～2007years corridor separated from the different parts of Haloxylon forestlandscape, the overall separated, landscape connectivity increases, resulting in thedeterioration of the living environment of Haloxylon.2. Analysis from the aspects of time change Gan Jia Hu Haloxylon forestlandscape pattern change of driving force factors, hammodendron growth period onaverage in the study area during1975~2007years temperatures overall rising trend.Precipitation in30years is on the rise, but change the most unstable, up and down in frequency is larger. With remote sensing image classification comparison found incentral Haloxylon forest plaques in the degradation. H. ammodendron growth periodaverage relative humidity of1975~1991annual average of61.46Percentage, theaverage of62.25Percentage from1992to2007, directly affect the disease increasedparasitization type high temperature and low humidity. The same period of remotesensing classification image contrast to the eastern part of the plaque area is agrowing volatility, into a massive continuous degradation.3. Human-driven factor in Research area is based on human behavior premisedin socio-economic area, overgrazing and reclaimed land. Intense human activities areone of the main reasons for the reduction of interference from affecting the study areaHaloxylon forest land.