不同根系类型草本植物根系土壤的原位水平挤压试验

IF 4.1 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Fangcui Liu, Shengwen Qi, Shenglin Qi, Xiaokun Hou, Yanrong Li, Guangming Luo, Lei Xue, Xueliang Wang, Juanjuan Sun, Songfeng Guo, Bowen Zheng
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引用次数: 0

摘要

不同类型的根系对土壤的影响十分复杂,目前仍不清楚。根据《植物学》中的分类方法,对荸荠、芋头和蒿三种植物的两种根系(即须根和直根)进行了四次原位挤压试验,通过对比分析了不同样品的推力-位移曲线和破坏形态,填补了上述空白。结果表明,根系可以降低土壤的脆性特征,增强其抵抗大变形的能力,不同类型的根系对根系-土体的应变硬化行为有不同的影响。须根系统对强度的贡献有限,而直根系统则能大幅提高强度和刚度。破坏模式的结果表明,须根系统和直根系统会影响土壤固化和表面裂缝的减少。然而,直根系统的影响取决于侧根和直根的组成:长而丰富的侧根能有效抵御裂缝的产生,但粗大的直根和稀疏的侧根可能会导致多条表面裂缝。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
In-situ Horizontal Extrusion Test of Herbaceous Root-Soil with Different Root Types

The influence of different types of roots on the soil is complex and still remains unclear. Four in-situ extrusion tests were conducted on two types of root systems, namely fibrous and tap root system, for three plants, Eleusine indica, Potentilla anserine, and Artemisia argyi, according to the classification in Botany, and the thrust-displacement curves and failure patterns of different samples were analysed by comparison to fill the aforementioned gap. Results reveal that the roots can reduce the characteristics of soil brittleness and enhance its capability to resist large deformation, and different root types contribute different effects to the strain-hardening behavior of the root-soil mass. The contribution of the fibrous root system to strength is limited, whilst the tap root system substantially enhances strength and stiffness. Results of failure patterns show that fibrous and tap root systems affect soil solidification and surface cracking reduction. However, the effect of the tap root system depends on the composition of lateral and tap roots: long and rich lateral roots are effective for resisting the creation of cracks, but thick tap roots with few and thin lateral roots may lead to several surface cracks.

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来源期刊
Journal of Earth Science
Journal of Earth Science 地学-地球科学综合
CiteScore
5.50
自引率
12.10%
发文量
128
审稿时长
4.5 months
期刊介绍: Journal of Earth Science (previously known as Journal of China University of Geosciences), issued bimonthly through China University of Geosciences, covers all branches of geology and related technology in the exploration and utilization of earth resources. Founded in 1990 as the Journal of China University of Geosciences, this publication is expanding its breadth of coverage to an international scope. Coverage includes such topics as geology, petrology, mineralogy, ore deposit geology, tectonics, paleontology, stratigraphy, sedimentology, geochemistry, geophysics and environmental sciences. Articles published in recent issues include Tectonics in the Northwestern West Philippine Basin; Creep Damage Characteristics of Soft Rock under Disturbance Loads; Simplicial Indicator Kriging; Tephra Discovered in High Resolution Peat Sediment and Its Indication to Climatic Event. The journal offers discussion of new theories, methods and discoveries; reports on recent achievements in the geosciences; and timely reviews of selected subjects.
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