An important form of land degradation is that induced by landslides. Vegetation recovery at coseismic landslide sites not only plays an important role in reducing soil erosion and increasing land stability but also records the transformation of loose, exposed landslide surfaces into stable hillslopes during the post‐seismic years. However, little is known about the vegetation recovery process or its influencing factors. In this study, we use the Moderate Resolution Imaging Spectroradiometer (MODIS) normalized difference vegetation index (NDVI) dataset, Tropical Rainfall Measuring Mission (TRMM) 3B42 daily precipitation data, and a digital elevation model (DEM) to study the impacts of precipitation and topographic parameters on vegetation recovery after the 2008 Wenchuan earthquake. Our results reveal significant NDVI decreases during the 2008 earthquake and strong recovery in the following years at the coseismic landslide sites. We also found significant negative correlations between precipitation and derivative of the NDVI trend (NDVI_DT) in 2010 and 2011 and significant positive correlations in 2009 and 2013 at the regional scale. These significant negative correlations indicate that precipitation may trigger landslides to remobilize, depressing the recovery of vegetation at coseismic landslide sites during the first few years following a major earthquake. The results further show that site‐specific vegetation recovery is determined by topographic parameters at the local scale. In general, vegetation recovery is weaker at low elevations (<1,300 m) and high elevations (>3,300 m), and it is also weaker on gentler slopes (<35°) than on steeper slopes (>35°).

中文翻译：

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2008年汶川地震后降水和地形对滑坡植被恢复的影响

土地退化的一种重要形式是由滑坡引起的。同震滑坡场址的植被恢复不仅在减少土壤侵蚀和增加土地稳定性方面起着重要作用，而且还记录了地震后几年中裸露的滑坡面向稳定的山坡转变的过程。但是，关于植被恢复过程或其影响因素知之甚少。在这项研究中，我们使用中等分辨率成像光谱仪（MODIS）归一化植被指数（NDVI）数据集，热带雨量测量任务（TRMM）3B42的每日降水量数据以及数字高程模型（DEM）来研究降水量和降水量的影响。地形参数对2008年汶川地震后植被恢复的影响 我们的结果表明，NDVI在2008年地震期间显着下降，并在随后的几年中在同震滑坡地点得到了强劲恢复。我们还发现降水与NDVI趋势的导数之间存在显着的负相关关系（2010年和2011年的NDVI _DT），以及2009年和2013年区域规模的显着正相关。这些显着的负相关关系表明，降雨可能会触发滑坡迁移，从而在发生大地震后的头几年内抑制同震滑坡场址处植被的恢复。结果进一步表明，特定地点的植被恢复取决于当地规模的地形参数。通常，低海拔（<1,300 m）和高海拔（> 3,300 m）的植被恢复较弱，平缓的坡度（<35°）也比较陡的坡度（> 35°）弱。