关键词:
China_Wetlands
Change trajectory of 40 years
Hidden loss
Restoration effects
Landsat data
摘要:
Understanding wetland change is critical to establishing and implementing international conservation and management *** such knowledge,supporting sustainable development,making management decisions,improving policies,and conducting scientific research become ***,consistent information on changes in Chinese wetlands has been *** applied the hybrid object-based and hierarchical classification approach to∼53,000 scenes of Landsat images acquired between 1980 and 2020 and created a national wetland mapping product(China_Wetlands)for six periods(e.g.,1980,1990,2000,2010,2015,and 2020).China_Wetlands revealed diverse changes in Chinese wetlands and their trajectories in response to climate change and human impacts over the past four ***,there was a substantial shrinkage in wetland area before 2015,with a small rebound between 2015 and *** net loss was∼60.9×10^(3)km^(2),which represents 12%of the area in ***,the loss of natural wetlands was hidden by human-made wetland gain with an offset of 15.6×10^(3)km^(2).Additionally,the expansion of surface water extent approximately 14.0×10^(3)km^(2)obscured the loss of vegetated *** loss in hotspot areas(e.g.,Sanjiang Plain and Yangtze River Delta)should not be *** sustainable management and effective conservation of wetlands in China should target wetland areas,landscape structures,and small wetlands delivering important ecosystem ***,the conversion of wetland types and the invasion of alien species need to be monitored and ***_Wetlands will be a critical wetland dataset for ecological research and the assessment of national and global environmental objectives(e.g.,the United Nation’s sustainable development goals).