| As an important link connecting the ecological environment and human well-being,ecosystem services provide an important guarantee for the survival and development of human beings.Its value assessment is an important reference for the preparation of ecological function zoning,the formulation of land use policies and environmental protection policies.The change of land use type will affect the change of ecosystem service value,and optimize the land use structure with the goal of maximizing the value of ecosystem services,which can provide useful reference for current land space planning,village land use planning and rural revitalization strategic planning.Based on the land use change data of Lishan Town in 2007,2012 and 2016,this paper draws on the research results of relevant experts and based on the revision of the ecosystem service value equivalent,the ecology of Lishan Town.The value of system services was evaluated and its value trends during the study period were analyzed.The spatial and temporal differentiation characteristics of ecosystem service value were analyzed by ArcGIS 10.3,and the reasons for its occurrence were discussed.With the goal of maximizing the value of ecosystem services,the linear planning model was used to optimize the land use structure of Lishan Town.Relevant implementation suggestions were proposed for the optimization plan.The conclusions are as follows:(1)During the study period,the land use structure of Lishan Town changed significantly.In terms of quantity,except for the increase in the area of construction land,the area of other types of land has been reduced to varying degrees.The construction land area has increased by 1001.99 hectares,indicating that the urbanization of Lishan Town has intensified.From the structural point of view,the information entropy and uniformity of the land use structure of Lishan Town are on the rise,and the dominance is slightly decreased,indicating that the degree of disorder of the land use structure of Lishan Town has been enhanced during the study period.The advantages of the dominant agricultural land and forest land are reduced,and land use tends to be diversified.(2)The value of ecosystem services in Lishan Town dropped from 1.13927 billion yuan in 2007 to 1.10970 billion yuan in 2016,with an average annual rate of change of-2.66%.Among them,forest land and water area have significant influence on the total value of ecosystem services in the study area,and the contribution rates of the two to ecosystem service value are about 53%and 31%respectively.The variation coefficient of ecosystem service value of land use type is significant,the variation coefficient of grassland is the largest,and the coefficient of variation of forest land is the smallest.(3)During the study period,the sensitivity index of the ecosystem service value of each land use type in Lishan Town was significantly less than 1,indicating that the ecosystem service value elasticity was insufficient and the estimation results were more accurate.The degree of correlation between different land use types is quite different,and the impact on the value of ecosystem services is different.(4)The value of the average ecosystem service in the northern part of Lishan Town is significantly higher than that in the south,and the level of the average ecosystem service value of individual administrative villages has changed.The spatial autocorrelation analysis was carried out by administrative villages.The Moran's I index values of the average ecological service values in 2007,2012 and 2016 were 0.8197,0.8235 and 0.7991,respectively,indicating that the ecological service value has a significant spatial positive correlation in space;In terms of local spatial autocorrelation,the high value areas of ecosystem services are mainly concentrated in the mountainous areas north of Cheshuigou Village,while the low value areas are mainly distributed in the plain areas south of Cheshuigou Village.(5)After optimizing the land use structure with the goal of maximizing the value of ecosystem services,the value of ecosystem services in Lishan Town in 2020 was 1.16840 billion yuan,an increase of 0.05870 billion yuan compared with 2016,and the rate of change was 5.29%.It shows that the optimization of land use structure has played a positive role in the value of ecosystem services in Lishan Town. |
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