Vegetation Recovery of Co-seismic Landslide and Long-Term Effect at Central Area of Wenchuan Earthquake
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P642.22;TP79

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    Abstract:

    [Objective] The vegetation recovery process of the co-seismic landslide at central area of Wenchuan earthquake was assessed in order to provide the basis for the ecological environment restoration, disaster prevention, and reconstruction after the earthquake in the study area.[Methods] Yingxiu Town of Wenchuan County, Sichuan Province was taken as a study area, and the dynamic changes of vegetation at landslide sites after the earthquake were analyzed based on multi-temporal images with a resolution of 30 m. The spatial distribution characteristics of vegetation recovery in the past nine years were analyzed based on the topographic factors.[Results] The vegetation of the landslides did not recover well from 2008 to 2011 in the study area, and 68% of the sites were below the "poor" level. During this period, the frequencies of rainstorms and debris flow activity remained high. After 2013, a better recovery level was reached overall, and the number of landsides below the poor level decreased to 32%. Then, it had been in a slow recovery process. In 2017, the landslides with a poor level of vegetation recovery were mainly located in the slope range of 30°-50°, the elevation range of 1 500-2 100 m, and a southeast slope aspect.[Conclusion] In the 9 years after the earthquake, the vegetation cover index increased to 0.74, and the average vegetation coverage index value was 0.08 less than that before the earthquake. Based on the statistical model, the vegetation cover index is expected to return to the pre-earthquake level in 2022. However, the population structure of vegetation with herbs and shrubs is different from that before the earthquake.

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王飞龙,陈明,王晓迪,丁军,张皓.汶川地震震中地区崩滑体的植被恢复与长期效应[J].水土保持通报英文版,2020,40(3):175-179

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History
  • Received:November 13,2019
  • Revised:January 16,2020
  • Adopted:
  • Online: July 15,2020
  • Published: