The Study On LUCC And Ecosystem Services Value In Qinghai Lake Based On GIS

Qinghai Lake is largest salt-water lake in China, the basin are located in humid monsoon region and the transition zone in arid areas, is very sensitive to global climate change, play an important role on Ecological security of the northeastern Tibetan Plateau, at the same time belong to the basin ecosystem typical of vulnerable areas, but also biological diversity conservation and ecological environment construction in key areas.Qinghai Lake basin Land Use/Land Cover Change in valuation of ecosystem services, Help further understanding of the importance of ecosystem services, but also for the regional environmental protection, resource development and utilization of reference for regional development planning, has some practical significance.In this paper, from 1987 to 2006 in Qinghai Lake Basin by two TM remote sensing image, GIS and RS technology for the use of the land use data, by calculating the land use dynamics, land use and land use change rate of relative degree, and then combined with Costanza and Xie Gaodi and other scholars, the value of ecosystem services approach systematically analyzes 20 years of Qinghai Lake basin land use / cover change due to changes in eco-efficiency.This analysis is divided into five parts:(1) Access to data interpretation situation;(2) Analysis of the study area the past 20 years of Land Use/Land Cover Change ;(3) Recalculated according to characteristics of the study area land use per unit area of the ecosystem services of value;(4) Calculation and analysis of 20 years per unit area of various land use and ecosystem service value and total value of ecosystem services and changes;(5) Analysis with sensitivity analysis of ecosystem service value coefficients of the total value of ecosystem services;The study area by Land Use/Land Cover Change analysis of the ecological value obtained:Land use / cover change and ecological environment closely, land use change will inevitably bring about changes in environmental quality in the 20 years 1987-2006, the study area of cultivated land, shrub, wetland, water area decreased, resulting in the Several types of land use to reduce the value of ecosystem services; grass and sand area increases, causing grass and sand increased the value of ecosystem services. 20 years from the transfer matrix of land use can be seen, grassland, wetlands and water bodies and barren lands to the sand transfer more, due to wetlands and water meadows of the ecosystem service value per unit area much larger than the sand on the whole, the study area in the past 20 years, the value of ecosystem services, the trend of a decreasing, reducing 328 million.Through sensitivity analysis results, the sensitivity index ecosystems are less than 1, the methodology of the study area based on ecosystem service value of its case to the adjustment factor is feasible, per unit area changes in the value of ecosystem services to total the value of ecosystem services has little effect.