The effect of Poaceae roots on the shear strength of soils in the Italian alpine environment
The effect of Poaceae roots on the shear strength of soils in the Italian alpine environment
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DOI：
10.1016/j.still.2009.11.006
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发表时间：
2010-01-01
影响因子：
6.5
通讯作者：
Druetta, A.
中科院分区：
文献类型：
--
作者：
Comino, E.;Druetta, A.
植被的存在通过增强土壤抗剪能力和影响土壤的水文地质条件，有助于保持坡面稳定和减少土壤侵蚀。近年来，植物根系对土壤稳定性的贡献已有研究，但其量化需要更多的研究，特别是草根的作用。这种贡献只有当滑坡是表面的时才是显著的；否则它们的作用与乔木或灌木相比微不足道，可以相互补充。本研究中广泛存在于高山环境中的草种属于禾本科：高羊茅、多年生黑麦草和草地早熟禾。本研究采用一种特定而快速的模型和方法，对三个不同位置的土块进行了有根或无根的原位剪切试验。结果表明，很少有草根逐渐腐烂，大部分草根倾向于完整地拔出土壤。用禾本科植物根部加固土计算的抗剪强度，比没有根的土壤直接测得的抗剪强度高50%到325%。剪切位移增加了93%~1544%。剪切时间总是较长。一旦进行了试验，带根的土块一直都很紧凑。(C)2009爱思唯尔B.V.保留所有权利。
The presence of vegetation contributes to maintaining slope stability and to reduce soil erosion, both by reinforcing soil shear resistance and influencing hydro-geologic conditions of soil.The contribution of plant root on soil stability had been studied in recent years, but its quantification needs more investigation, in particular concerning the effect of grass root. This contribution can be significant only when the slide is superficial; otherwise their action is negligible compared to arboreal species or shrubs and can be complementary.The grass species widespread in the Alpine environment used in this research belong to the Poaceae family: Festuca pratensis, Lolium perenne and Poa pratensis.This study considers in situ shear tests on soil blocks in the presence or absence of roots made in three different locations, using a specific and expeditious model and methodology. Subsequently the roots properties are compared.Results showed that few grass roots gradually fail and the most of them are inclined to pull out of the soil unbroken. Shear-strengths calculated for root-reinforced soil with Poaceae, yielded values between 50% and 325% higher than directly measured shear-strengths in soil with no roots. The shear displacement had an increase included between 93% and 1544%. The shear time was always longer. Once the trials were made, the clod with roots were all the time compact. (C) 2009 Elsevier B.V. All rights reserved.