Evaluation Of Eco-environmental Quality Of Land Use Change In Manasi River Basin

Land use / cover change(LUCC)is the core driver of global and regional ecological changes.With the rapid development of large-scale industrialization,urbanization,the scale of artificial land in arid area,the intensity of natural land is compressed or replaced in different degrees,and the land use type and structure of arid area have changed fundamentally.At the same time,desertification hazards are also spreading,desertification,salinization is difficult to contain,oasis land use change in the development of frontier social economy,improve the people’s livelihood and welfare,but also to the local ecological environment has brought great pressure.How to scientifically and rationally develop and utilize the land resources and promote the coordinated development of land use and ecological environment is a major problem that must be solved in agricultural modernization and new urbanization in arid area.In a typical inland river basin in Manasi River Basin as the research object,based on the prin ciples of energy ecology and landscape ecology,RS and GIS were used to analyze the characterist ics of land use change.And then using RSEI(remote sensing eco-environmental index)to demon strate the trend of ecological environment quality change.Finally,through establishing the relation ship between land use change and ecological environment quality change.Systematically analyzes the spatial and temporal differentiation process and pattern change of ecological environment qua lity caused by land use change,and explores the ecological and environmental effects of land use change in the Manasi River Basin in the past 23 years.The results show:1.This paper analyzes the characteristics of land use change in the Manasi River Basin from 1993 to 2016,from the three aspects of land use type change,structural change and transfer direction.(1)The change of land use quantity in Manasi River Basin in 1993-2016 shows the area of cultivated land,grassland,construction land increased,the area of desert,woodland,water and unused land decreased.This indicates that the natural area of the river basin is decreasing and the artificial land area is increasing continuously.(2)From the transfer matrix point of view,the use of land use types are more frequent and diverse.Cultivated land and construction land area increased,unused land,desert,woodland,water area decreased.This indicates that the land use structure in the basin has changed greatly due to human activities.(3)Under the influence of MODS system in arid area,there are significant differences in land use types between mountainous,alluvial fan,alluvial plain and desert area.2.Based on the ecological environment quality characteristics of the RSEI.The ecological environment quality index is divided into worst,poor,general,good and excellent total of 5,through the transfer matrix analysis on the overall show "Four minus one increase".Worst,poor,general,good grade area decreased,excellent area of the surge,the basin ecological environment quality has been significantly improved.The superiority is mainly distributed in the oasis of arable land and mountain forest land,and to the upstream alluvial fan and both sides of the terrace to expand,which shows the role of human land cover,resulting in significant changes in the ecological environment.The results showed that the ecological quality improvement area of the Manasi River Basin was more than that of the deteriorated area.The improvement area was concentrated in the oasis of the cultivated land,and a large number of unused land was converted into arable land.The deterioration area was concentrated Distributed in the woodland,construction land and waters.3.Land use type and structure change affect the development of ecological environment quality.This kind of change can be divided into two kinds according to the ecological environment effect.One type has a positive effect on the ecological environment effect,which is manifested in the desert,unused land is reduced by the cultivated land and the construction land,and the ecological environment quality is improved.The other type has a negative impact on the ecological environment effect,mainly realized as forest land,the continuous reduction of water area,forest land and waters on the stability and development of the ecological environment of the basin has an important impact,the reduction of the area caused by the ecological environment more fragile.Based on the previous research on Manasi River Basin,this paper explores the inherent mechanism of land use and ecological environment effect.It is found that land use type and structure change have obvious influence on ecological environment quality.The distribution pattern of land use also largely determines the distribution pattern of ecological environment quality.This study is consistent with the reality of arid area,which is of great practical significance to promote the adjustment of land use structure and maintain oasis ecological balance in arid area.