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首页> 外文期刊>Berichte des Meteorologischen Institutes der Universitat Freiburg >Root anchorage under the combined condition of wind pressureand intensive rainfall:tree-pulling experiments with controlled soil water content
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Root anchorage under the combined condition of wind pressureand intensive rainfall:tree-pulling experiments with controlled soil water content

机译：风压与强降雨联合条件下的根系锚固：土壤水分控制下的拔树试验

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摘要

Root anchorage was examined under the condition of strong wind and intensive rainfall by con-ducting tree-pulling experiments with controlled water content in the soil. Wind damage in for-ests mainly results from typhoons, one of the tropica.Lcyclones, in Japan. Typhoons frequentlycause both strong wind and heavy rainfall. Current wind damage studies have focused on windpressure, while the consideration of intensive water supply to the soil has been absent. Our aimis to analyse the effects of root anchorage when exposed to intensive water supply in the soil.Tree-pulling experiments were conducted for 30-year old hinoki trees (Chanwecyparis obtusaSieb. et Zucc.), one of the most important commercial coniferous species in Japan, in experi-mental forests of Shizuoka University, Shizuoka Prefecture, Japan. Before the experiments,water was supplied on the soil surface area of 2 x 2 m2 around a target tree up to 12.5, 25, 50,100, 200, 400 mm of precipitation. We also examined soil resistance to vertical penetration,water content in the soil and root plate, and soil and root plate movement were additionallymeasured. Water content inside root plate significantly results in terms of the maximum turningmoment at stem base (TMmax). Supplying water reduced soil resistance; however, no relation-ship was found between vertical resistance of soil and TM,,. Although further studies are re-quired, additional impacts on root anchorage such as water content in the soil need to be consid-ered for regions where both strong wind and heavy rainfall are expected.
机译：在强风和强降雨条件下，通过在土壤中水含量受控的情况下进行树木牵引试验，检查了根系固着情况。森林的风灾主要是由日本热带气旋之一的台风造成的。台风经常造成强风和大雨。当前的风害研究集中在风压上，而没有考虑向土壤大量供水。我们的目的是分析在土壤中大量供水时根系锚固的影响。对30年历史的扁柏树（Chanwecyparis obtusaSieb。et Zucc。）进行了拉树试验，该树是该国最重要的商业针叶树种之一日本，位于日本静冈县静冈大学的实验林中。实验之前，在目标树周围2 x 2 m2的土壤表面积上提供水，降水量最多为12.5、25、50、100、200、400毫米。我们还检查了土壤对垂直渗透的抵抗力，土壤和根板中的水分含量以及土壤和根板的运动。根板内部的含水量显着导致茎基部的最大转弯矩（TMmax）。供水减少了土壤阻力;然而，在土壤的垂直阻力与TM之间没有关系。尽管需要进一步的研究，但对于预计强风和大雨的地区，还需要考虑对根部锚固的其他影响，例如土壤中的水分。

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