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.
陕北黄土区护坡植物根系分布和抗剪增强分析
- Title:
- Analysis of Root Distributions and Shear Strengths of Slope Protection Plants in the Loess Region of Northern Shaanxi
- 文章编号:
- 1005-3409(2020)03-0357-07
- Keywords:
- root morphological distribution; shear strength; root-soil composite; slope protection plants
- 分类号:
- S157.1
- 文献标志码:
- A
- 摘要:
- 林草一体生态护坡是广泛应用的边坡防护模式,科学选择护坡植物并且合理有效的空间配置对提高坡体稳定性具有重要意义。试验选取黄土区自然坡体常见护坡植物小叶杨和白羊草为研究对象,利用三维坐标采样法,通过洗根—扫描—图像分析—根—土复合体抗剪增强试验,研究二者根系形态分布以及相应的根土复合体的抗剪增强作用,以期为护坡植物选择和栽植模式提供依据。结果表明:(1)根长、根表面积以及根系直径与距离小叶杨主根距离的关系均表现为指数函数显著下降(p<0.05); 其与土层深度的关系同样表现为指数函数显著下降(p<0.05)。植物根系主要分布在0—60 cm的土层深度中,根长和根表面积二者分别占其总量的75.49%,73.92%。(2)根—土复合体的根长和根表面积与残余抗剪强度均表现为线性函数显著上升(p<0.05)。在0—30 cm的土层深度中,根—土复合体的最大抗剪强度较素土提升了约11倍,在40—60 cm的土层深度,最大抗剪强度较素土提升了8～9倍,在70—100 cm的土层深度中,其最大抗剪强度约为素土的3倍。因此说明小叶杨和白羊草作为护坡植物具有较好的固土能力和抗剪能力,是较合理的护坡植物选择以及合适的植物配置方式,这对于边坡的生态防护也具有一定的指导意义。
- 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.
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备注/Memo
收稿日期:2019-07-25 修回日期:2019-08-22资助项目:国家自然科学基金(41771322); 国家重点研发计划(2017YFC0504504)第一作者:潘天辉(1993—),男,内蒙古阿拉善盟人,硕士研究生,研究方向:植物生理生态。E-mail:1406234356@qq.com通信作者:杜峰(1971—),男,内蒙古乌兰察布人,博士,副研究员,主要从事植物种群、群落生态及生理生态的研究。E-mail:dufeng@ms.iswc.ac.cn