Catena ( IF 6.2 ) Pub Date : 2021-08-09 , DOI: 10.1016/j.catena.2021.105652 Karel Šilhán 1
Dendrogeomorphic-based landslide activity dating is a commonly employed scientific approach used to detect historical landslide events with subannual precision. Trees are dominantly used for this research, but in some localities, current dendrogeomorphic methods are not suitable due to their exclusive occupation by shrub species. Nevertheless, shrub species have recently been successfully used in dendroclimatic research. Thus, this study aims to evaluate the applicability of common shrub species in Europe (Corylus avellana L.) in dendrogeomorphic research on landslides. In total, 71 stem samples from 11 shrub groups were macroscopically and microscopically analysed. Nearly half of the samples provided evidence supporting the presence of tension wood as a response to stem tilting due to landslide movement. The intensity of tension wood expressed by changes in vessel lumen area corresponded to the intensity of stem tilting, but no relationship was found for ring eccentricity. Moreover, the eccentricity of rings was found to be inapplicable to landslide event detection due to the short length of the studied C. avellana ring series. Nevertheless, the analysis of tension wood provided evidence of two past landslide events (2010 and 2014) and the absence of chronological noise. Moreover, the onset of tension wood was very abrupt, enabling the dating of landslide movements with seasonal precision. This assumption was verified by an analysis of potential triggers: extreme precipitation and high river discharge. Moreover, the roots of C. avellana exposed during the triggering flood undercutting the landslide base expressed a similar anatomical response to exposure, as seen in the cases of broad-leaved tree species. The results of this study could distinctly extend the use of dendrogeomorphic analysis of landslides into regions with no tree vegetation.
中文翻译:
灌木在检测滑坡运动中的树状地貌应用:以 Corylus avellana L 为例。
基于树状地貌的滑坡活动年代测定是一种常用的科学方法,用于以亚年精度检测历史滑坡事件。树木主要用于这项研究,但在一些地方,目前的树状地貌方法不适合,因为它们被灌木物种所占据。尽管如此,灌木物种最近已成功用于树木气候研究。因此,本研究旨在评估欧洲常见灌木物种(Corylus avellanaL.) 在山体滑坡的树状地貌研究中。总共对来自 11 个灌木组的 71 个茎样本进行了宏观和微观分析。近一半的样本提供的证据支持张力木的存在是对滑坡运动引起的茎倾斜的反应。以血管腔面积变化表示的张力木强度与茎倾斜强度相对应,但与环偏心无关。此外,由于研究的C. avellana 的长度较短,发现环的偏心率不适用于滑坡事件检测戒指系列。尽管如此,对张力木的分析提供了过去两次滑坡事件(2010 年和 2014 年)的证据,并且没有按时间顺序排列的噪音。此外,张力木的出现非常突然,能够以季节性精确的方式确定滑坡运动的年代。这一假设通过对潜在触发因素的分析得到验证:极端降水和高河流流量。此外,在触发洪水期间暴露的C. avellana根部对滑坡底部的侵蚀表现出类似的解剖学反应,如在阔叶树种的情况下所见。这项研究的结果可以明显地将山体滑坡的树状地貌分析扩展到没有树木植被的地区。