Root Evaluation of Slope Protection Vegetation Characteristic Indexes on Expansive Soil in Nanning City Based on Entropy Value Method

Xu Yingzi; Zhu Qiaosheng; Huang Xiao

doi:10.13961/j.cnki.stbctb.2022.02.026

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Root Evaluation of Slope Protection Vegetation Characteristic Indexes on Expansive Soil in Nanning City Based on Entropy Value Method

- Root Evaluation of Slope Protection Vegetation Characteristic Indexes on Expansive Soil in Nanning City Based on Entropy Value Method
- Bulletin of Soiland Water Conservation Vol. 42, Issue 2, Pages: 189-194(2022)
- 作者机构：
  
  1. 广西大学土木建筑工程学院,广西,南宁,530004
  2. 广西防灾减灾与工程安全重点实验室,广西,南宁,530004
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2022.02.026
  CLC： Q948.15;S157.1;TU443
- Published：2022
- 稿件说明：
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Xu Yingzi, Zhu Qiaosheng, Huang Xiao. Root Evaluation of Slope Protection Vegetation Characteristic Indexes on Expansive Soil in Nanning City Based on Entropy Value Method[J]. Bulletin of Soiland Water Conservation, 2022, 42(2): 189-194.
DOI：

Xu Yingzi, Zhu Qiaosheng, Huang Xiao. Root Evaluation of Slope Protection Vegetation Characteristic Indexes on Expansive Soil in Nanning City Based on Entropy Value Method[J]. Bulletin of Soiland Water Conservation, 2022, 42(2): 189-194. DOI： 10.13961/j.cnki.stbctb.2022.02.026.

摘要

[目的] 评价植物对膨胀土边坡的防护作用，为膨胀土边坡防护植被的选取提供科学参考。[方法] 在广西壮族自治区南宁市膨胀土地区草本植被中，选取8种常见植物并提取其整体根系特征及分层根系特征，统计分层根系特征的根长量、根表面积、根直径、根体积4个指标值。采用熵值法对所提取的4个根系特征指标进行赋权量化，并基于不同指标的权重综合比较评价植被根系护坡效果的优劣。[结果] 植被的直径在0.25~0.55 mm，随深度加深变化不大。5 cm的浅层土中的根长量、根表面积、根体积占整个深度范围的50%～85.4%，且随着土层深度的增加而急剧递减。鬼针草的根长量、根表面积、根体积在整个深度范围中均有明显优势。根长量、根表面积、根直径、根体积的权重系数分别为0.310 0，0.243 2，0.165 4，0.281 5。综合评价值最高的是鬼针草，为0.916，其次为高羊茅，为0.761。最低的是黑麦草，为0.110。[结论] 基于不同指标权重综合分析结果，鬼针草的评级最高，最适合作为南宁膨胀土地区的护坡植被。

Abstract

[Objective] The protective effect of plants on the slope of an expansive soil was evaluated in order to provide a scientific reference for the selection of protective vegetation on the slope of expansive soils. [Methods] Eight common plants were selected from the herbaceous vegetation in the expansive soil area in Nanning City

Guangxi Zhuang Autonomous Region

and their overall root characteristics and stratified root characteristics were extracted. The four indexes of stratified root characteristics (root length

root surface area

root diameter

and root volume) were calculated. The entropy method was used to assign weights to the four characteristic indexes of the root system

and the advantages and disadvantages of the slope protection effect of vegetation root systems were evaluated comprehensively based on the weight of different characteristic indexes. [Results] The results showed that the root diameter of vegetation ranged from 0.25 mm to 0.55 mm

and there was little change with depth. Root length

root surface area

and root volume in shallow soil of 0—5 cm layer) accounted for 50.0%~85.4% of the entire depth range

and decreased sharply with increasing soil depth. Root length

root surface area

and root volume had obvious advantages over the entire depth range. The weight coefficients of root length

root surface area

root diameter

and root volume were 0.310 0

0.243 2

0.165 4

and 0.281 5

respectively. The comprehensive evaluation value was the highest for Bidens pilosa. (0.916)

followed by Festuca elata (0.761). The lowest value was observed for Lolium perenne (0.110). [Conclusion] Based on the comprehensive analysis of different index weights

the rating of Bidens pilosa was the highest

and therefore

this species is the most suitable for slope protection in the expansive soil area of Nanning City.

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references

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