Post-seismic vegetation recovery is critical to local ecosystem recovery and slope stability, especially in the Wenchuan earthquake area where tens of thousands of landslides were triggered. This study executed a decadal monitoring of post-seismic landslide activities all over the region by investigating landslide vegetation recovery rate (VRR) with Landsat images and a (nearly) complete landslide inventory. Thirty thousand landslides that were larger than nine pixels were chosen for VRR analysis, to reduce the influence of mixed pixels and support detailed investigation within landslides. The study indicates that about 60% of landslide vegetation gets close to the pre-earthquake level in ten years and is expected to recover to the pre-earthquake level within 20 years. The vegetation recovery is significantly influenced by topographic factors, especially elevation and slope, while it is barely related to the distance to epicenter, fault ruptures, and rivers. This study checked and improved the knowledge of vegetation recovery and landslide stability in the area, based on a detailed investigation.

中文翻译：

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利用Landsat影像发现汶川地震区植被恢复和滑坡活动

震后植被恢复对当地生态系统恢复和边坡稳定至关重要，特别是在引发数万次滑坡的汶川地震区。本研究通过使用 Landsat 图像和（几乎）完整的滑坡清单调查滑坡植被恢复率 ( VRR )，对整个地区的地震后滑坡活动进行了十年监测。三万个大于九个像素的滑坡被选作VRR分析，减少混合像元的影响，支持滑坡内的详细调查。研究表明，大约60%的滑坡植被在十年内接近震前水平，预计在20年内恢复到震前水平。植被恢复受地形因素影响显着，尤其是海拔和坡度，而与震中距离、断层破裂、河流等几乎没有关系。本研究在详细调查的基础上，检查并提高了对该地区植被恢复和滑坡稳定性的了解。