Based on a nine-phase land use dataset from 1980 to 2023,we analyzed the trends and extent of wetland changes in the Yangtze River Basin,and further explored the driving mechanisms of wetland degradation using the optimal-parameter Geographical Detector model.The results indicated that:① Wetland area in the basin exhibited a net increase of 7934.73 km2,primarily driven by the expansion of reservoirs and ponds.Conversely,lakes and tidal flats showed significant reductions,with a loss of 1037.05 km2 and 161.90 km2,respectively.②Wetland degradation was concentrated in the middle reaches,including Lake Poyang,Lake Dongting,the Wuhan urban lakes,and the downstream coastal areas.These wetlands were converted primarily to construction land(2357.54 km2),cropland(933.79 km2),grassland(819.05 km2),forest land(488.37 km2),and unutilized land(220.20 km2),with the largest area converted to construction land,followed by cropland.These conversions accounted for 4.25%and 1.68%of the basin's total wetland area,respectively.③ The optimal parameter geographical detector revealed that wetland degradation in the Yangtze River Basin was influenced by multiple interactive factors,with particularly significant interactions between elevation(DEM)and the annual maximum daily minimum temperature(TNx),in combination with other environmental variables.
Yangtze River basinwetlandinteractive effectsoptimal parameter geographic detector
NETL
NSTL
万方数据
