Study On Landscape Pattern Evolution And Eco-environmental Assement In The Middle And Upper Reaches Of Fuhe River

The deterioration of the ecological environment caused by the rapid development of society can directly affect human production and life.Fuhe is one of the important tributaries of the Poyang Lake water system.In 2017,it became the first national pilot project for comprehensive management and sustainable development of water environment in Jiangxi Province.Although the ecological environment of the basin is well-founded,the intensification of human activities has caused many negative impacts on the ecological environment of the basin.Therefore,this paper takes the middle and upper reaches of Fuhe as the research area,analyzes the landscape change law of the basin,and evaluates the ecological environment quality of the basin,which provides reference for the protection and management,comprehensive management and development of the ecological environment in the middle and upper reaches of Fuhe.This paper selects the Landsat images in 2001,2009 and 2017 as the main data sources,interprets the watershed landscape type map,and uses the change model of land use change range and landscape transfer matrix to analyze the landscape quantitative characteristics and dynamic changes in the middle and upper reaches of Fuhe River.The landscape pattern index analysis method is used to quantitatively analyze the landscape pattern and change trend in the middle and upper reaches of Fuhe River;the ecological environment evaluation index system in the middle and upper reaches of Fuhe River is constructed,and the ecological environment quality of the middle and upper reaches of Fuhe River is analyzed by using analytic hierarchy process and comprehensive index evaluation method.The evaluation was carried out to analyze the status and trends of the ecological environment in the basin.According to the research:(1)From 2001 to 2017,the landscape area of construction land and other land use in the upper reaches of the Fuhe river basin increased,the landscape area of forest land,cultivated land and water area continued to decrease,and the landscape area of grassland and beach land decreased first and then increased;The transformation between different landscape types is mainly based on the transfer of cultivated land and forest land and the transfer of construction land.(2)From 2001 to 2017,the landscape of forest land has always been the dominant landscape type in the middle and upper reaches of Fuhe river.The landscape superiority of construction land is increasing,and the landscape of construction land tends to be concentrated.The degree of fragmentation of the basin landscape is deepened and the diversity of landscape is increased.The landscape types tend to be balanced.(3)The overall ecological environment of the middle and upper reaches of Fuhe is of good quality.The quality of the ecological environment is concentrated on the general grade,and the proportion of the extreme level in the basin has been small.The watershed eco-environmental quality grades are spatially characterized by regional characteristics.The difference grades are mainly distributed in flat terrains,especially in the construction-intensive areas and on both sides of the river and around the lake.The superior and good grades are mainly distributed in the southwest and east of the basin.High altitude areas and parts of the northeastern part of the upper reaches.(4)The area of the ecological environment with no obvious change in the middle and upper reaches of Fuhe River has a large area.From 2001 to 2009,the ecological environment quality has improved.However,after 2009,the area of the degraded area is higher than that of the improved area,and the ecological environment has changed significantly.difference.