Research On Land Use Change And Ecological Effects In Chang He Watershed Of Jincheng City

Land use change is an important part of global environmental change research.It affects the structure and function of ecosystems at different scales.Analyzing land use changes and their ecological effects is of great significance for the rational division of ecological management and control zones,It is of great significance to realize sustainable development.The Chang He Watershed belongs to the ecologically fragile area of the Loess Plateau.Due to the acceleration of the urbanization process and the massive mining of coal,the land use structure is irrational and the land is destroyed.As a result,the ecological environment tends to deteriorate.In order to reveal the changes in the structure and function of ecosystems in the Chang He Watershed caused by human activities,Based on Arcgis,this study used the remote sensing image data from three phases of Chang He Watershed in 2005,2010,and 2015,The following researches have been carried out:(1)Analyze the temporal and spatial changes of land use in Chang He Watershed from 2005 to 2015;(2)Analyze the impact of land use change on ecosystem service value;(3)Analyze the impact of land use change on ecological risk;and Conduct ecological effects Systematic cluster analysis.Through the above content research,we reached the following conclusions:(1)In the 10 years,the types of land use in the Chang He Watershed have changed to varying degrees,with continuous reduction of cultivated land and continuous increase in construction land.Woodland,grassland,and water areas have increased first and then decreased slightly.In 2005-2010,the land use types circulated frequently,mainly reflecting the shift of cultivated land to grassland and construction land.The increase in construction land mainly comes from the transfer of cultivated land and grassland.In the ten years,the overall degree of land use dynamics in Chang He Watershed decreased,and the land-based changes tend to ease and are relatively stable.During the period of the study,the Chang He Watershed landscape fragmented.From 2005 to 2010,the degree of fragmentation of land use types increased.From2010 to 2015,the land use types of landscapes tend to stabilize.(2)In the 10 years,the value of ecological services in Chang He Watershed has decreased by 2.4×10~5 yuan.Taking the village as the research unit,the ecological service value of Chang He Watershed is below the middle level for 10 years,and the ecological service value level of each administrative village during 2005-2010 changes greatly.From 2010 to2015,the change is relatively small and tends to be stable,showing a high level in the west.Low spatial distribution in the middle.Based on the analysis of the grid method,during the period of study,the value of ecological services in the Chang He Watershed was below the middle level,showing a downward trend.However,the local high ecological service values were concentrated in the west,and there was a significant positive correlation between the ecological service values in the three periods.(3)The overall pattern of long-term river basin ecological risk has not changed much in the past 10 years,but the spatial differences are more obvious.The risk on both sides of the Chang He Watershed gradually decreases;Based on the results of ecological service value and ecological risk assessment in Chang He Watershed in 2015,through systematic cluster analysis,it was concluded that the overall ecological effect of Chang He Watershed was at a low level.