Marsh wetland degradation risk assessment and change analysis: A case study in the Zoige Plateau,China |
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| Affiliation: | 1. College of Tourism, Shanghai Normal University, Shanghai 200234, PR China;2. College of Life and Environmental Sciences, Shanghai Normal University, Shanghai 200234, PR China;3. Environmental Sciences Division, Oak Ridge National Laboratory, TN 37831, USA;1. School of Nature Conservation, Beijing Forestry University, Qinghua East Road 35, Haidian District, 100083 Beijing, China;2. School of Environmental Science and Engineering, South University of Science and Technology of China, 518055 Shenzhen, China;1. CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China;2. Zoige Peatland and Global Change Research Station, Chinese Academy of Sciences, Hongyuan 624400, China;3. University of the Chinese Academy of Sciences, Beijing 100049, China;4. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China;5. College of Life Science, China West Normal University, Nanchong 637000, China |
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| Abstract: | Wetlands play an important role in regional development and environmental protection. Under the impact of natural and artificial factors, the plateau wetlands have degenerated and even disappeared, resulting in serious problems for society and the ecological environment. It is necessary to establish a reasonable risk assessment method to evaluate the risk of wetland degradation, and then to analyze changes in the range and features of risk. For this work, the Zogie Plateau wetland was selected as the study area. For this site, a wetland degradation risk assessment method was established based on the conceptual model of Ecological Risk Assessment (ERA). The method included nine indicators used to analyze the wetland hazard index, wetland vulnerability index, and wetland degradation risk synthetically. From the spatial-temporal pattern, the wetland degradation risk was analyzed using data from 2000 to 2014. The calculated results revealed the following: (1) from 2000 to 2014, the wetland hazard index (WHI) showed a trend of increase, the value of which increased from 0.29 to 0.42, with a growth rate of 44.83%. Similarly, the wetland vulnerability index (WVI) significantly increased from 0.30 to 0.54, with a growth rate of 80%. Over the same time, the total wetland area decreased from 3910.25 km2 to 2777.38 km2, a reduction of 28.97%. (2) Using the equidistant method, the risk value was divided into three risk grades. The wetland degradation risk in the whole region is increasing, and the risk rank has changed from the low risk zone (0.092) to the medium risk zone (0.25). The degradation risk becomes greater with distance from the center to fringe areas. |
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| Keywords: | Wetland degradation Risk assessment Wetland hazard index Wetland vulnerability index Zoige wetland |
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