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4种不同植被群落类型表土的抗蚀力学特性
格日乐1,2, 郝需婷1, 苏日娜1, 孙保平2, 黄静1, 崔天民1
1.内蒙古农业大学 沙漠治理学院, 内蒙古 呼和浩特 010019;2.北京林业大学 水土保持学院, 北京 10083
摘要:
[目的]研究黄土高原农林业生产表层土壤水土流失,为该区域及其相似地区生态修复中树种选择及配置提供科学依据。[方法]以杨树+柠条乔灌混交林、杨树纯林、油松常绿针叶林和柠条灌木纯林下4种不同植被群落类型下表土为对象,进行抗剪力学特性研究,并分析土壤含水率对其力学特性的影响力。[结果]在测试表土含水率2.5%~12.5%范围内,4种不同植被类型及裸地对照样地土壤结皮抗剪强度和黏聚力均随着土壤含水率的增加呈增大的趋势,表明在一定范围内表土湿润程度的增加对提高土壤表层抗蚀能力起到积极作用;4种不同植被群落类型表土抗剪强度和黏聚力的值均显著大于裸地的值,说明水土保持的林草措施对表层土壤结构的改善起到了促进作用,从而提高了表层土壤的抗侵蚀能力;在测试含水率2.5%~12.5%范围内随着含水率的增加各样地表土内摩擦角无明显的变化规律。[结论]4种不同植被群落类型中柠条+杨树混交林下表土抗剪强度、黏聚力总体表现最大,这也从另外一方面说明了水土保持的林草措施中营造混交林的优越性。
关键词:  表土  抗剪强度  黏聚力  内摩擦角  土壤含水率
DOI:10.13961/j.cnki.stbctb.2019.03.001
分类号:S152.7;S157.1
基金项目:国家自然科学基金项目“梯度应力下植物根系在固土抗蚀受损后自修复的生物力学响应机制”(41867011);内蒙古自然科学基金项目(2017MS0407)
Mechanical Properties of Topsoil Anti-erodibility Under Four Different Vegetation Community Types
Ge Rile1,2, Hao Xuting1, Su Rina1, Sun Baoping2, Huang Jing1, Cui Tianmin1
1.College of Desert Control Science and Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010019, China;2.School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
Abstract:
[Objective] The soil erosion of topsoil in agricultural forestry production in Loess Plateau was researched in order to provide scientific basis for the selection and allocation of tree species in ecological restoration in this area and its similar areas.[Methods] The shear mechanical properties of topsoil under four different vegetation community types including poplar + Caragana korshinskii mixed forest, poplar pure forest, Pinus tabulaeformis evergreen coniferous forest and C. korshinskii shrub pure forest were studied, and the influence of soil moisture content on its mechanical properties was analyzed.[Results] In the range of 2.5%~12.5% of the water content of the test topsoil, the shear strength and adhesion of the surface soil were increased with the increase of soil moisture content in 4 different vegetation types and bare ground, indicating that the increase of soil moisture played a positive role in improving the anti-erodibility of soil surface in a certain range. The shear strength and adhesion values of topsoil under 4 different vegetation community types were significantly larger than those of bare land, which indicated that the soil and water conservation measures had improved surface soil structure, thus improving the anti-erodibility of the surface soil. There was no significant change in friction angle of surface soil with the increase of water content in the range of 2.5%~12.5%.[Conclusion] The shear strength and cohesion of the topsoil under the mixed forest of lime + poplar were the greatest among the four different vegetation community types, which also explained the superiority of mixed forest in forest and grass measures of soil and water conservation.
Key words:  topsoil  shear strength  cohesion  internal friction angle  soil moisture