Landsat-based observation of human pressure to wetlands in Ramsar sites over the Yangtze River Delta
YAN Heng-qi1,2, ZHU Wei-hong1, MAO De-hua2, WANG Zong-ming2,5, LIANG Min-xuan3, KANG Ying-dong4, YANG Guang6
1. Key Laboratory of Wetland Ecological Functions and Ecological Security, College of Geography and Ocean Sciences, Yanbian University, Yanji 133002, China; 2. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; 3. School of Geography and Environment, Jiangxi Normal University, Nanchang 330022, China; 4. College of Earth Sciences, Jilin University, Changchun 130012, China; 5. National Earth System Science Data Center, Beijing 100101, China; 6. Aviation University of Air Force, Changchun 130000, China
Abstract：This study applied an object-oriented classification method to Landsat MSS/TM/OLI images covering four wetland sites with international importance (Ramsar sites) in the Yangtze River Delta, including the Chongming Dongtan Nature Reserve, Dafeng (Elaphurus davidianus) National Nature Reserve, Hangzhou Xixi National Wetland Park, and Yancheng National Nature Reserve, to obtain five land cover datasets during 1980 to 2015. By examining spatiotemporal changes of wetland area, landscape pattern, and landscape matrices, human pressures on wetlands were quantified. Results show that: (1) during the 35 years, wetland area in these four Ramsar sites had declined continuously, with the largest decrease in the Chongming Dongtan Nature Reserve (27.2% drop in area); (2) the number and density of patches in the four Ramsar sites had been increasing, which led to more fragmentation and the decrease in the landscape connectivity; (3) the expansion of cropland and developed land was the dominant driving factor of wetland loss, while enhanced human pressure from the aquaculture pond expansion and exotic species invasion imposed increasing impacts on wetlands; (4) In general, the designation of Ramsar sites played important roles in reducing human disturbances and protecting natural wetland ecosystems, such as in the Dafeng National Nature Reserve. However, protection effectiveness of the four Ramsar sites would require further improvement in terms of reducing wetland loss and human pressure in the sites.
焉恒琦, 朱卫红, 毛德华, 王宗明, 梁旻轩, 康应东, 杨桄. 长江三角洲国际重要湿地人为胁迫遥感解析[J]. 中国环境科学, 2020, 40(8): 3605-3615.
YAN Heng-qi, ZHU Wei-hong, MAO De-hua, WANG Zong-ming, LIANG Min-xuan, KANG Ying-dong, YANG Guang. Landsat-based observation of human pressure to wetlands in Ramsar sites over the Yangtze River Delta. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(8): 3605-3615.
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