| The ecological space is composed of various types of ecological land.It is the main area that guarantees the stability and integrity of regional ecosystems and provides ecosystem services.In this paper,based on the land use characteristics,ecological benefits and research purposes of Huaqiao,the urban ecological land is defined as land with ecological service function or with the role of maintaining urban ecosystem balance and providing biological habitats.In the process of urban construction,the quantity,structure and landscape pattern of ecological land are constantly changing,which affects the service function of the ecosystem.By studying the relationship between the evolution of ecological land and the value of ecosystem services,it can provide reference for maintaining regional ecological security and maintaining the stability of ecosystem.In this study,based on high-resolution remote sensing images and GIS technology,the temporal and spatial dynamic characteristics of ecological land,dynamic characteristics of landscape pattern in Huaqiao International Service Business Park was investigated by land use transition matrix,gravity centre calculation,landscape pattern index.The study area is located in a small-scale area(50.09km~2)with a highly developed economy in the southern of Jiangsu.Based on the research results of scholars at home and abroad,combined with the actual situation of Huaqiao,the ecosystem service value equivalence factor and evaluation model were revised to evaluate the ecosystem service value of the region,and the relationship between the evolution of the ecological land use and the changes in the value of ecosystem services was analyzed.The results showed that:(1)From 2005 to 2009,due to the rapid expansion of construction land in the process of rapid urbanization in the study area,a large number of cultivated land transferred to construction land,the total area of ecological land decreased by 334.22 hm2.From 2010 to 2015,the reduction of ecological land has continued to decrease.However,the area of forest land,water area and wetland has increased greatly,and the dominance has been greatly improved.The ecological spatial structure of Huaqiao has gradually changed from cultivated land to various types.The state of balanced development of ecological land will gradually realize the optimal allocation of land resources.During these 10 years,the degree of fragmentation of various types of ecological land was generally high.The area of Tianfu Village in the north of Huaqiao was included in the control of the“ecological red line”in Kunshan City.The ecological land in this area has always been well protected.In contrast,the southern part of Huaqiao is under greater pressure from the expansion of construction land.In order to improve the ecological environment in the south of Huaqiao,various comprehensive parks such as Central Park and Wusong Riverside Park were built in Huaqiao from 2010 to 2015,thus promoting the ecological center of gravity to migrate southward.(2)The total value of ecosystem services of Huaqiao in 2005,2009 and 2015 was 13.76million yuan,21.82 million yuan and 39.11 million yuan,which showed an increasing trend.Among them,the changes in the value of ecosystem services in waters and wetlands and forested land have a greater impact on the changes in the total value of ecosystem services in Huaqiao,which is 7.15 and 5.53 times that of cultivated land.From 2005 to 2015,the value of regulating services and cultural services increased significantly,and among the various indicators,the index of providing aesthetic landscapes was the most dynamic.It reflected that,in recent years,the construction of ecological civilization has been regarded as the primary task of urban construction in Huaqiao.(3)The value of ecosystem services per unit area of forest land and wetlands is 3.56 times and3.47 times of that of cultivated land in Huaqiao.Therefore,reasonable increase in the area of forest land and wetlands is an effective way to enhance the value of regional ecosystem services.In the future,it is necessary to focus on strengthening the protection of forest and wetland ecosystems in urban planning and construction.Under the reality that China has a large population and the shortage of cultivated land resources,it is also necessary to implement strict control over cultivated land.From the perspective of ecological sustainable development of Huaqiao,the ecological space in the north has been well protected.In the future,areas with high ecosystem service functions near the Wusong River in the south of Huaqiao can be included in the control area of“Ecological Red Line”for key protection.And for the area outside the control area of“Ecological Red Line”,where the construction land is relatively dense,it can be repaired by“Green stitching”.Through the implementation of the divisional control of the ecological space of Huaqiao,the ecological environment will be promoted to achieve a virtuous circle. |
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