Effects Of Land Use And Land Cover Change On The Vulnerability Of Social Ecosystem In The Middle Reaches Of Heihe River

Concern in the global change, to the background of the increasingly prominent contradictions, caused by unreasonable human activities and extensive mode of economic development in the global climate warming, fragile ecosystems, scientists gradually attention, become the core and key problems in the research field, and land use / Cover Change(LUCC) is the land use system, the economic activity of human society and the natural ecological interaction process is the most direct form, it is the two link, therefore, the research of land use / cover change and its influence on the social ecological system vulnerability, to improve the LUCC research results, discuss the regional factors and research system the fragility of the sustainable development of science has obvious significance.In this paper, to 35 years, 5 period of land use / cover change data as the main source, in the land use changes in the magnitude of the type, land-use dynamic degree, land use degree and the land transfer in the process of the variation trend and distribution pattern analysis based, use related to natural, social and economic data was constructed in the middle reaches of Heihe River social ecological system vulnerability index evaluation system, and the vulnerability evaluation model of the spatial pattern of social ecological system vulnerability classification, on the basis of this, discusses the social ecological system is fragile of soil land use efficiency, based on the above work, mainly the following conclusions:On the basis of previous on TM image interpretation, according to the need of the research, land use types are divided into eight kinds of land use types, from the point of view of the spatial variation of the data for a period of 5, in the middle reaches of Heihe River land use change greatly to mainly with human life and production is closely related to, mainly concentrated in the cultivated land and urban land, rural residents, among them, cultivated land and urban land, other construction land and rural residents points trend of expansion, and water area and forest and grassland have more significantly reduced. Based on the land use / cover change calculation and analysis of the data obtained, different time periods in the study area, the dynamic degree of land use increased with time in the growing trend, the frequency of land continued to increase, frequent human activities and the interference degree also increased year by year; with the deepening land development degree the land use degree, rise in the basic stage, the rise was more than 0, a good momentum of development; the analysis of transfer matrix model, the transfer process of land use, natural land into arable land, most of the urban residents, rural areas, habitat quality decreased significantly, especially in the area of water reduced rapidly, human activity area is increasing year by year.Using the vulnerability evaluation model, constructed the evaluation system of vulnerability in the middle reaches of Heihe, and the division of the fragility of the spatial distribution pattern, results show that in the middle reaches of Heihe social ecological system vulnerability in North South High low trend, and with the Heihe valley towards the same, a strip distribution in the study period; in the different vulnerability index basic upward trend, but in 2010, the system pressure in north central region significantly improved, and the north central region to achieve reforestation efforts in large; shifting from space vulnerability to see, the relative rise of vulnerability degree in the middle reaches of Heihe, most occurred in the mild fragile the strength of fragile area transformation process.This paper is divided into3 steps of ecological vulnerability of land use efficiency were described and analyzed, results show that closely related to the different land use patterns and the degree of vulnerability, more frequent human activities, the development and utilization of area more deeply, the degree of vulnerability is deep; vulnerability index of different land use in the human use level of vulnerability index is much higher than the natural recycling level, the impact of human activities on the natural habitat of the great land system; high vulnerability areas The use of the transfer is more frequent, the land use and the system vulnerability in the spatial correlation is stronger, the social ecological environment of land use change effect is remarkable.