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Shallow landslide disposition in burnt European beech (Fagus sylvatica L.) forests

机译:欧洲山毛榉(Fagus sylvatica L.)森林中的浅层滑坡处置

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摘要

Tree roots contribute significantly to soil strength on hillslopes. In the case of wildfires, this effect may abruptly vanish and be lacking for a considerable period of time depending on the resistance and resilience of the forest. Despite its importance, quantitative data on the impact and dynamics of wildfires on slope stabilization is still lacking. We use the study case of the Fagus sylvatica L. to quantify the medium-term evolution of root reinforcement and its effect on slope stability in fire-injured forests. In the study, we upscale root reinforcement using field data for the calibration of the Root Bundle Model and detailed information on forest structure in 244 plots, and calculate the spatio-temporal dynamics of forest protective capacity using a three-dimensional probabilistic slope stability model (slideforNET) for different site types. In unburnt and low-burn forests, the protective capacity was found to remain constant over time. Forests hit by moderate burns continue to provide adequate protection for shallow (depth < 0.5 m) and cohesive soils only, whereas in the case of high severity fires, the protective capacity vanishes for 15 years and an increased shallow landslide probability remains for at least 40 years. These conditions call for appropriate sylvicultural post-fire measures.
机译:树根对山坡上的土壤强度有显着贡献。在野火的情况下,这种影响可能突然消失,并在相当长的一段时间内消失,这取决于森林的抵抗力和复原力。尽管其重要性,但仍缺乏有关野火对边坡稳定的影响和动态的定量数据。我们使用青冈水杨的研究案例来量化根系加固的中期演变及其对火灾森林中边坡稳定性的影响。在研究中,我们使用现场数据对根束模型进行了校准,并对244个样地的森林结构进行了详细的信息,从而对根系进行了升级,并使用三维概率边坡稳定性模型来计算森林保护能力的时空动态( slideforNET)。在未燃烧和低燃烧的森林中,保护能力随时间而保持不变。遭受中度烧伤的森林继续仅对浅层(深度<0.5mm)和粘性土壤提供足够的保护,而在严重烈火下,保护能力消失了15年,浅层滑坡的可能性至少增加了40%年份。这些条件要求采取适当的营火后采伐措施。

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