Differentiating past events on a cone influenced by debris‐flow and snow avalanche activity – a dendrogeomorphological approach
Differentiating past events on a cone influenced by debris‐flow and snow avalanche activity – a dendrogeomorphological approach
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区分受泥石流和雪崩活动影响的锥体上的过去事件——树状地貌学方法
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
Gion
中科院分区：
文献类型：
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作者：
M. Stoffel;M. Bollschweiler;Gion
树状地貌学用于调查受泥石流和雪崩影响的圆锥体上过去发生的事件。我们报告了 251 个受伤的落叶松落叶松的 520 个核心的结果。和云杉 (L.) 喀斯特。在伯奇巴赫锥体（瑞士阿尔卑斯山）上采集的树木样本。对树木年轮序列的详细分析可以对从 1750 年到 2002 年的 252 年期间单棵树木的 561 次生长干扰进行年代测定，这可以归因于 30 个不同的事件年份。然后，我们定位了树木年轮内成排的创伤性树脂导管（TRD）的位置，以评估季节内的损坏位置。与当地生长期的数据一致，位于新生长轮开始处的TRD被认为是10月下旬至5月初休眠季节或最早的早材发生雪崩影响的结果。相比之下，早材晚期或晚材内发现的 TRD 被认为是冰缘泥石流活动的结果，因为树木年轮的这些层是在 7 月至 10 月初期间局部形成的。
Dendrogeomorphology was used to investigate past events on a cone affected by both debris flows and snow avalanches. We report on results of 520 cores from 251 injured Larix decidua Mill. and Picea abies (L.) Karst. trees sampled on the Birchbach cone (Swiss Alps). Detailed analysis of tree‐ring sequences allowed dating of 561 growth disturbances in individual trees for a 252 yr period, extending from 1750 to 2002, which could be attributed to 30 different event years. We then localized the position of rows of traumatic resin ducts (TRDs) within the tree ring so as to assess the intra‐seasonal position of damage. In agreement with data on the local growth period, TRDs located at the beginning of the new growth ring were considered the result of avalanche impacts that occurred during the dormant season or in earliest earlywood between late October and early May. In contrast, TRD found in late earlywood or within latewood were considered the result of periglacial debris‐flow activity, as these layers of the tree ring are locally formed between July and early October.