Evaluation Of Ecosystem Service Value In Changhai County ——Based On Land Use Perspective

Land use is the most basic social practice of human beings.With the rapid development of economy,human activities have increasingly interfered with nature.Unreasonable land use leads to the destruction of land ecosystem,the reduction of ecosystem service value,and frequent environmental pollution problems.The study of ecosystem service value from the perspective of land use is of great significance for understanding the impact of human land use activities on ecological security and optimizing land use.In this thesis,Changhai County was selected as the study area.Based on the remote sensing data of Changhai county in 2008,2013 and 2018,dynamic attitude of land use change and comprehensive index of land use degree were used to reveal the law of land use evolution in the study area.The ecosystem service value of Changhai county was calculated by equivalent factor method,and the ecosystem service value of changhai county in different periods,different land types and different services was analyzed.The accuracy of measuring ecosystem service value by sensitivity coefficient;Finally,the relationship between land use change and ecosystem service value was analyzed.The main conclusions are as follows:（1）In 2018,The land use structure of Changhai county is diversified,except water area and unused land,the other four types of land have little difference in proportion;During the study period,the area of construction land,grassland and water area increased,while the area of cultivated land,unused land and forest decreased.From the perspective of land use dynamic attitude,unused land dynamic attitude is the largest,the dynamic attitude is-8.64%,forest land dynamic attitude is the lowest,-0.06%.From the perspective of land use intensity,the land development intensity of Changhai county is above medium level.The change of island grassland and unused land inChanghai county was consistent with the change of land use,and the change of other land types had their own characteristics.The land use distribution of each island has its own characteristics,but woodland is an important land type in each island.（2）From the perspective of ecosystem service value change,the ecosystem service value of Changhai County decreased firstly and increased by 3,102,600 yuan in total from 2008 to2018;In terms of single value,the service value of maintaining biodiversity was the highest in2018,while the service value of food production was the lowest.From the perspective of regional value,the ESV value of forestland is an important component of the total value of ecosystem services,contributing 60%.During the study period,the ESV values of grassland and water area continued to increase,while the ESV values of the other four land types decreased.From the ESV of the five islands in Changhai County,Dachangshan Island had the highest ESV and Haiyang Island had the lowest ESV in 2018.During the study period,the ecosystem service values of Xiaochangshan Island and Haiyang Island increased,while those of Dachangshan Island,Guanglu Island and Zhangzi Island decreased.The sensitivity indices of ESV values in the study period were all smaller than 1,indicating that the measurement results of THE ESV value of Changhai county were inelastic to its value coefficient,and the MEASURED ESV value of Changhai County in this thesis was reliable.（3）From the perspective of the impact of land change on ecosystem service value,grassland in Changhai County contributed the most to ecosystem service value deterioration,followed by water area.The contribution rates of cultivated land,construction land,forest land and unused land are all less than 0.The relatively stable natural environment and social and economic factors of islands are important factors affecting land use and ESV.