4种乔木根系不同埋根方式根-土复合体的抗剪特性

doi:10.11707/j.1001-7488.20140914

林业科学 ›› 2014, Vol. 50 ›› Issue (9): 105-111.doi: 10.11707/j.1001-7488.20140914

4种乔木根系不同埋根方式根-土复合体的抗剪特性

盖小刚, 陈丽华, 蒋坤云, 汲文宪

北京林业大学水土保持学院水土保持与荒漠化防治教育部重点实验室北京 100083

收稿日期:2013-03-31 修回日期:2013-11-03 出版日期:2014-09-25 发布日期:2014-09-30
基金资助:
国家“十二五”科技支撑计划“三北”地区水源涵养林体系构建技术研究与示范（2011BAD38B05）。

Shear Characteristic Research on Root-Soil Composite in Four Kinds of Roots of Trees and Different Root Buried Ways

Gai Xiaogang, Chen Lihua, Jiang Kunyun, Ji Wenxian

Key Laboratory of Soil & Water Conservation and Desertification Combating of Ministry of Education College of Soil and Water Conservation, Beijing Forestry University Beijing 100083

Received:2013-03-31 Revised:2013-11-03 Online:2014-09-25 Published:2014-09-30
Contact: 陈丽华

摘要/Abstract

摘要：

在固定的土壤含水量和干密度条件下,分别选取直径3,5和7 mm的落叶松、油松、白桦和蒙古栎根系,采用水平埋根、垂直埋根和复合埋根的方式制备直径为101 mm的根土复合体试样；应用全自动三轴压缩仪,设定围压分别为200,400和600 kPa,对试样进行固结不排水试验,评价埋根方式和根系直径对土壤抗剪强度的影响。结果表明: 加根复合体的抗剪强度明显大于素土,抗剪强度随着埋根直径的增加而增大,土壤抗剪强度表现为复合根复合体>水平根复合体>垂直根复合体。植物根系在土壤中形成横纵交错的状态对减少滑坡等自然灾害可起到更好的作用。

关键词: 乔木根系, 三轴压缩试验, 土壤抗剪强度

Abstract:

In order to explore the mechanical mechanism of arbors roots to prevent shallow landslide by holding water and soil, we selected root systems of diameter in 3, 5 and 7 mm of larch, pine, birch and Mongolia oak, and buried horizontally or vertically roots and buried horizontally and vertically roots to make into root-soil composite plots with a diameter of 101 mm in the soil with fixed water content and dry density conditions. Then a consolidated undrained (CU) test was conducted with an automatic triaxial compression tester by setting the confining pressure in 200, 400 and 600 kPa to evaluate the impact of buried-root modes and root diameters on the shear strength of the soil. The results showed that root-soil complex in shearing strength was significantly greater than pure soil, and the shear strength was in an order of: complex root complex> horizontal root complexes> vertical root complex. It was shown that the composite root in enhancing soil strength effect was most efficient, and thus, the composite root forest tree species would be the best in enhancing the soil strength to maintain soil stability.

Key words: tree roots, triaxial compression test, soil shear strength

中图分类号:

S714.7

盖小刚, 陈丽华, 蒋坤云, 汲文宪. 4种乔木根系不同埋根方式根-土复合体的抗剪特性[J]. 林业科学, 2014, 50(9): 105-111.

Gai Xiaogang, Chen Lihua, Jiang Kunyun, Ji Wenxian. Shear Characteristic Research on Root-Soil Composite in Four Kinds of Roots of Trees and Different Root Buried Ways[J]. Scientia Silvae Sinicae, 2014, 50(9): 105-111.

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4种乔木根系不同埋根方式根-土复合体的抗剪特性

Shear Characteristic Research on Root-Soil Composite in Four Kinds of Roots of Trees and Different Root Buried Ways

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