Study On Land Use Change And Ecosystem Service Value In Qionglai City

the rapid development of urbanization affects the change of land use driven by economic development,and at the same time extends a series of environmental problems,and the ecosystem is destroyed,which threatens people's survival.Exploring the link between land use and ecosystem services can provide scientific advice for future land use planning and coordinated development of regional economy.This study relies on the key laboratory of the ministry of education and the cooperative innovation center,with the support of the national natural science foundation project and the humanistic and social science planning fund project of the ministry of education,we select qilai city of plain mountain transition zone as the research area,and use remote sensing and gis technology to extract information from the remote sensing image data of 2000a,2007a,2008a,2018a 4 phase.The main conclusions are as follows:(1)During the 2000-2018a period,the main types of land use were woodland and cultivated land.The sum of the two areas always accounts for more than 90%of the total area.The area of woodland and construction land has increased year by year,each of which has increased by 6517.48 hm~2 and 7135.73 hm~2;the area of cultivated land and water body has decreased,respectively,by 13644.51 hm~2 and 375.75 hm~2;the area of unused land and grassland has decreased first and then increased,the total area of unused land has increased by 452.96 hm~2,while the area of grassland has decreased by 86.21 hm~2.(2)The regional spatial pattern of land-use change in the study area is basically the same.The northwest is the woodland concentrated distribution area,the middle is the cultivated land concentrated area,the construction land is concentrated in the city center and the east factory concentrated area,the space change is not big.The land use change of each township is obviously different.The major villages and towns with large variations in local areas are:Linqiong Town and Yang'an Town,with the largest increase in construction land area,with 1447.78 hm~2 and 1261.19 hm~2respectively;Linji Town,with the largest increase in woodland area,with 1130.13 hm~2and Datong Township,with the largest decrease in woodland area,577.08 hm~2;Datong Township,with the largest increase in cultivated land area of 468.05 hm~2,Linqiong Town,with the largest decrease in cultivated land area of 2,253.34 hm~2 and Yangan Town,with a decrease in cultivated land area of 2024.54hm~2;High Ridge Town,with a decrease in water area of 141.64 hm~2 and Huilong Town,with a maximum area of51.48 hm~2.(3)The transfer of land and property in each township is obvious.Forest land is mainly converted from cultivated land and construction land,and cultivated land to forest land is concentrated in Linji Town and Jiaguan Town in the southwest.The woodland conversion land is concentrated in Datong Township,Linqiong Town,Shuikou Town,Linji Town and so on.The conversion of construction land to woodland,conversion of construction land to cultivated land and conversion of cultivated land to construction land are mainly distributed in Linqiong Town,which is located in the central urban area,and Yang'an Town,a factory area with relatively rapid economic development in the east;woodland,water and construction land are the main sources of conversion of cultivated land.In general,the ESV shows a downward trend.A total of 12681.26×10~4 yuan was reduced,with a decrease of 2.93%.The ecological service value of Qionglai city is roughly the spatial distribution pattern of"west high east low",and the distribution of the service value of the average ecosystem in the whole study period is relatively small.The order of ecosystem service value of each land use type from high to low is:woodland>cultivated land>water body>unused land>grassland>construction land.The woodland and unused land are in the state of increasing overall,and the growth value of woodland is the largest,which is30096.77×10~4 yuan.The ESV of construction land,grassland,cultivated land and water body showed a decrease,and the construction land decreased the most,reaching21865.27×10~4 yuan.(5)The sensitivity coefficients of this study are all less than 1.It shows that the ecosystem service value is not sensitive to the ecosystem service value sensitivity coefficient,and the ecological service value coefficient used in this study has credibility,which accords with the reality of Qionglai City.(6)The relationship between land use and ESV was analyzed by using variation contribution rate and coordination degree.The change of ecosystem service value of construction land and cultivated land and the change of ecosystem service value of Qionglai city have the same directional change,and the ecosystem service value of woodland has a negative effect on the decline of ESV in Qionglai city.The coordination degree of Qionglai city is generally low conflict state,that is,the increase of ecosystem service value is negative,land transformation has a negative impact on the ecological environment.