| Ecosystem services are all kinds of resources that human beings can obtain from the nature for their survival and development,which also represent the well-being of human beings.As an important water source area of the middle route of south-to-north water diversion project in China,the quantitative analysis and evaluation of land use and ecosystem services in the region where Danjiangkou reservoir is located is of crucial significance for promoting the sustainable use of natural resources in the region.In Danjiangkou city,Hubei province and Henan Xichuan county as study area,based on using the RS and ArcGIS processing time and platform of TM remote sensing image data and DEM data,extraction in 1987,1996,2007,2017,Danjiangkou and Xichuan county land use types of remote sensing image data,remote sensing method is used to collect data of land use types of phase iv.Analysis of Danjiangkou city and Xichuan county during the study period of land use dynamic degree of attitude,index,the transfer matrix,the information entropy,and explore the characteristics of land use at the same time,according to the per unit area ecosystem service value when the scale to build the town ecosystem services evaluation model,and combining the actual situation in the study area,the urban ecological system gas regulation,nutrient cycling,purifying environment,the types of services such as entertainment culture value are calculated,and then to Danjiangkou city from 1987 to 2017 and Xichuan evaluate and measure the dynamic evolution of service value,On this basis,the influence of land use change on ecological service value in water source area is analyzed by using contribution degree and correlation.The main research results are as follows:(1)1987-2017,the main forest land use change is more intense,three times the average transfer ratio is 28.31%,forest land,urban area is in a state of continuous increase,grassland,cultivated land area in a declining state,evolution trend to increase,decrease,water area increased,while other land area is increasing,reducing,evolution trend;Topographically,the land is mainly distributed in the elevation range of 0-600 m and the slope range of 0-25°,with an area proportion of more than 85%.Besides the plane,the area of each ecosystem in the slope direction accounts for 10% to 13% of the total area.(2)According to the calculation of the ecological service value of the research area,the ecological service value of the water source area showed an overall increasing trend from 1987 to 2017.Among all the ecological service systems,forest land,grassland,cultivated land and water area accounted for the main sources.Hydrologic regulation has the main advantage in each service type.At the same time,under different elevation and gradient,the service types and the service value of the service system decrease with the increase of the gradient.However,in different slope gradients,the service value of each service type and the service system is not different from that of the other eight directions except the plane direction.(3)By analyzing and calculating the correlation and variation contribution rate between the ecosystem and its service value,it is found that each ecosystem in the region is closely related to the total value of regional ecological services,and the correlation coefficient between the ecosystem and the total value of regional services of forest land,grassland,farmland,town and water area reaches more than 0.9.The contribution rates of different types of ground objects to the value of ecological services are different in different periods.Among them,water area,forest land and grassland system have the greatest impact on the value of their services,while farmland,town and other systems have less impact on the value of their services. |
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