[1]PAN Tianhui,DU Feng,WANG Yue.Analysis of Root Distributions and Shear Strengths of Slope Protection Plants in the Loess Region of Northern Shaanxi[J].Research of Soil and Water Conservation,2020,27(03):357-363,371.
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Analysis of Root Distributions and Shear Strengths of Slope Protection Plants in the Loess Region of Northern Shaanxi
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 03
Page number:
357-363,371
Column:
目次
Public date:
2020-04-20
- Title:
- Analysis of Root Distributions and Shear Strengths of Slope Protection Plants in the Loess Region of Northern Shaanxi
- Keywords:
- root morphological distribution; shear strength; root-soil composite; slope protection plants
- CLC:
- S157.1
- DOI:
- -
- Abstract:
- Forest-grass integrated ecological slope protection is a widely used slope protection mode. Scientific selection of slope protection plants and rational and effective spatial allocation are of great significance to improve slope stability. In this experiment, Populus simonii Carr. and Bothriochloa ischaemum (L.) Keng, the common slope protection plants in the Loess region, were selected as the research samples. By using three-dimensional coordinate sampling method, root-washing-scanning-image analysis and root-soil composite shear-strengthening test, the root morphology distributions and the corresponding shear-strengthening effects of root-soil composite were examine in order to provide the basis of selection and planting pattern of for slope protection plants. The main results were as follows.(1)The relationships between root length, root surface area, root diameter and distance from the main root of Populus simonii Carr. show a significant decrease which can be described by exponential function (p<0.05); the relationship between root length and soil depth also showed a significant decrease which can be described by exponential function (p<0.05). Root length and root surface area in depth of 0—60 cm account for 75.49% of and 73.92% of the total values, respectively.(2)The root length, root surface area and residual shear strength of root-soil composite increased linearly (p<0.05). The maximum shear strength of root-soil composite is about 11 times higher than that of pure soil in the depth of 0—30 cm, 8～9 times higher than that of pure soil in the depth of 40—60 cm, and 3 times higher than that of pure soil in the depth of 70—100 cm. Therefore, as the slope protection plants, Populus simonii Carr. and Bothriochloa ischaemum (L.) Keng, have better abilities of soil consolidation and shear resistance, and are more reasonably selected slope protection plants and the appropriate plant allocation patterns, which has a certain guiding significance for slope ecological protection.
- References:
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Last Update:
2020-04-30