The rapid expansion of urban land is an important cause of coastal wetland loss.Based on the Murray global intertidal dataset and the global impervious surface dataset,this study explored the loss of coastal salt marshes caused by the expansion of urban land at different scales through spatial overlay analysis using ArcGIS.The study showed that from 2002 to 2019,the global coastal salt marshes lost as much as 526.7 km2 due to the continuous urban expansion,of which,the largest loss was in mudflats,with an area of 306.5 km2,which was about 1.4 times of the total loss of mangroves and herbaceous marshes.The area of coastal salt marshes occupied by urban expansion of around the globe showed a tendency of first increasing and then decreasing from 2002 to 2019.In terms of spatial distribution,Asia was the continent with the largest area of coastal salt marshes occupied by urban expansion,with an area of 413.3 km2,followed by North America,and the least was Europe.Among the top five countries in terms of wetland area,China was the country with the largest area of coastal salt marshes occupied by urban expansion,and Russia was the country with the smallest occupied area.This study provides beneficial data support for the conservation and restoration of coastal salt marsh wetlands,which is of great significance for realizing the sustainable development of urban expansion and resources.
关键词
城镇化/滨海盐沼/时空特征/全球尺度/长时序
Key words
Urbanization/Coastal salt marshes/Spatial and temporal trends/Global scale/Long time series
维普
万方数据