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| Effects of moisture content and dry density of soil on the friction characteristics between Pinus tabulaeformis root and soil |
| Zheng Liwen1, Liu Xiaoguang2, Tu Zhihua1, Chen Lihua1, Yu Xinxiao1 |
1.College of Soil and Water Conservation, Beijing Forestry University, 100083, Beijing, China;
2.School of Naval Architecture ,Ocean and Civil Engineering, Shanghai Jiao Tong University, 200240, Shanghai, China |
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Abstract In order to evaluate the effect of the different soil physical characteristics on soil reinforcement by plant roots, the experiment of directly pulling out single roots of Pinus tabulaeformis was conducted by implementing pull-out load, and the effect of the different soil moisture contents and dry densities on the friction performance between tree roots and soil system was tested. The results showed that the test of directly pulling out single roots had two main failure modes: pulled out and broken, and there existed a significantly linear correlation between root diameter and root-soil friction. We analyzed the friction between roots and soil by establishing a simplified single-root model, and the results agreed with the experimental conclusion. In a certain range of the root diameter, the maximum root-soil friction increased first and then decreased with the increasing soil moisture, while increased with the rising soil dry density.
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Received: 25 December 2013
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