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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Biotic controls on shallow translational landslides
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Biotic controls on shallow translational landslides

机译：浅平移滑坡的生物防治

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In undisturbed tropical montane rainforests massive organic layers accommodate the majority of roots and only a small fraction of roots penetrate the mineral soil. We investigated the contribution of vegetation to slope stability in such environments by modifying a standard model for slope stability to include an organic layer with distinct mechanical properties. The importance of individual model parameters was evaluated using detailed measurements of soil and vegetation properties to reproduce the observed depth of 11 shallow landslides in the Andes of southern Ecuador. By distinguishing mineral soil, organic layer and above-ground biomass, it is shown that in this environment vegetation provides a destabilizing effect mainly due to its contribution to the mass of the organic layer (up to 973 t ha~(-1) under wet conditions). Sensitivity analysis shows that the destabilizing effect of the mass of soil and vegetation can only be effective on slopes steeper than 37.9°. This situation applies to 36% of the study area. Thus, on the steep slopes of this megadiverse ecosystem, the mass of the growing forest promotes landsliding, which in turn promotes a new cycle of succession. This feedback mechanism is worth consideration in further investigations of the impact of landslides on plant diversity in similar environments.
机译：在未受干扰的热带山地雨林中，大量的有机层容纳了大部分根部，只有一小部分的根部穿透了矿物土壤。我们通过修改边坡稳定性的标准模型以包括具有不同机械特性的有机层，研究了植被在此类环境中对边坡稳定性的贡献。使用土壤和植被特性的详细测量值来评估单个模型参数的重要性，以再现厄瓜多尔南部安第斯山脉11处浅层滑坡的观测深度。通过区分矿物土壤，有机层和地上生物量，表明在这种环境下，植被提供了去稳定作用，这主要是由于其对有机层质量的贡献（在潮湿条件下可达973 t ha〜（-1））。条件）。敏感性分析表明，土壤和植被的失稳作用仅对大于37.9°的斜坡有效。这种情况适用于研究区域的36％。因此，在这个大面积生态系统的陡峭山坡上，生长中的森林会促进滑坡，进而促进新的演替循环。在进一步研究类似环境中滑坡对植物多样性的影响时，值得考虑使用这种反馈机制。

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