Study on spatio-temporal evolution of habitat quality based on land-use change in Chongming Dongtan, China

Abstract

Chongming Dongtan is an important habitat for international migratory birds. It is of great significance to study its land use and habitat quality change for rare waterfowl protection and ecological environment restoration. Based on the land use data in 2002, 2008, 2012, 2016 and 2020, this paper analyzes the relationship between land-use change and habitat quality evolution in Chongming Dongtan in recent 18 years using InVEST model, land use dynamic degree and land use degree index. The results show that the main types of land use in the study area are water area and cultivated land, followed by woodland, reed beach, grass beach, bare beach and construction land. Among them, bare beach and construction land have changed dramatically, the former continuing to decrease while the latter continuing to increase. Moreover, the increasing speed began to slow down after 2012, and the increasing part was mainly from the surrounding cultivated land. Second, in terms of time change, the degradation of habitat quality in Chongming Dongtan has been gradually improved from aggravating trend in the past 18 years. In terms of spatial distribution, the habitat degradation degree of Chongming Dongtan is higher in the east and lower in the west, spreading from the center to the surrounding. Based on this, the change of land use and the interference of human activities are the important reasons for the change of ecological environment quality.