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首页> 外文期刊>European journal of forest research >Root anchorage of hinoki (Chamaecyparis obtuse (Sieb. Et Zucc.) Endl.) under the combined loading of wind and rapidly supplied water on soil: analyses based on tree-pulling experiments
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Root anchorage of hinoki (Chamaecyparis obtuse (Sieb. Et Zucc.) Endl.) under the combined loading of wind and rapidly supplied water on soil: analyses based on tree-pulling experiments

机译：风和快速供水在土壤上的联合负荷下的扁柏（Chamaecyparis obtuse（Sieb。Et Zucc。）Endl。）的根部锚固：基于拔树实验的分析

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Wind damage in Japan is mainly caused by typhoons (i.e., tropical cyclones), which are characterized by intensive heavy rainfall and strong winds. In this study, we conducted tree-pulling experiments on two sites to find out whether rapidly supplied water on the soil would affect stability of root anchorage of hinoki (Chamaecyparis obtuse (Sieb. Et Zucc.) Endl.), as expected. For the experiments, we first supplied several quantities of water around the target trees, and then they were pulled down using a wire winch. On study site 1 (Kamiatago experimental forest), we applied general tree-pulling experiments (no water supply) in 2008 and six different irrigation treatments around the target trees in 2009. On study site 2 (Chiyoda experimental forest), we applied one irrigation treatment in 2009. As a result, five trees were uprooted and two were broken in 2008, and all nine trees were uprooted in 2009 on study site 1, regardless of irrigation treatment. On study site 2, two trees pulled down after 4h of watersupply were ruptured at the stem base, opposite to two trees pulled down immediately after supplying water. The water content below the root plate significantly affected root anchorage and more specifically, the maximum turning moment, stem angle at themaximum force, and stiffness index. Moreover, water inside the root plate increased root anchorage at the beginning of a tree failure process. However, it also reduced the root plate area of the hinge side. Conversely, high water content below the root plate decreased root anchorage.
机译：日本的风灾主要是由台风（即热带气旋）造成的，其特点是强降雨和强风。在这项研究中，我们在两个地点进行了拉树实验，以了解在土壤上快速供应的水是否会按预期的方式影响扁柏（钝角钝角Cha（Sieb。Et Zucc。）Endl。）根系锚固的稳定性。对于实验，我们首先在目标树木周围提供了一些水，然后使用绞盘将其拉下。在研究场地1（香木实验林）上，我们于2008年进行了一般的树木抽水试验（无供水），在2009年对目标树木进行了六种不同的灌溉处理。在研究场地2（千代田实验林），我们进行了一次灌溉。结果在2009年进行了5棵树的连根拔起，其中2棵在2008年被砍伐，2009年，研究地点1上的9棵树全部被连根拔起，无论灌溉如何处理。在研究地点2，供水4小时后倒下的两棵树在茎根处破裂，与供水后立即倒下的两棵树相反。根板下方的含水量显着影响根部锚固，尤其是最大转弯力矩，最大作用力下的茎杆角度和刚度指数。此外，在树木破坏过程开始时，根板内部的水增加了根部固着力。但是，这也减小了铰链侧的根板面积。相反，根板下方的高水分含量会降低根系固着力。

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