[1]洪苗苗,汪 霞,*,等.浅层滑坡多发区典型植被恢复树种根系对土壤抗剪强度影响[J].山地学报,2018,(01):107-115.[doi:10.16089/j.cnki.1008-2786.000306]
 HONG Miaomiao,WANG Xia*,ZHAO Yunfei,et al.Effect of Ecological Restoration Plants Root on Slope Reinforcement in Shallow Landslide Prone Region[J].Mountain Research,2018,(01):107-115.[doi:10.16089/j.cnki.1008-2786.000306]
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浅层滑坡多发区典型植被恢复树种根系对土壤抗剪强度影响()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2018年01期
页码:
107-115
栏目:
山地灾害
出版日期:
2018-01-30

文章信息/Info

Title:
Effect of Ecological Restoration Plants Root on Slope Reinforcement in Shallow Landslide Prone Region
文章编号:
1008-2786-(2018)1-097-09
作者:
洪苗苗1汪 霞1 2*赵云飞1欧延升 1黄 政1
1.兰州大学 资源环境学院,兰州 730000; 2.兰州大学 西部环境教育部重点实验室, 兰州 730000
Author(s):
HONG Miaomiao1 WANG Xia12*ZHAO Yunfei1OU Yansheng1 HUANG Zheng1
1.College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China; 2.MOE Key Laboratory of Western China's Environmental Systems, Lanzhou University, Lanzhou 730000, China
关键词:
浅层滑坡区 植被根系 抗拉强度 RWM模型
Keywords:
superficial landslides Arbor root systems tensile strength RWM model
分类号:
X43
DOI:
10.16089/j.cnki.1008-2786.000306
文献标志码:
A
摘要:
为揭示坡面植被根系对土壤抗剪强度的影响及其固坡效应的差异性,选取白龙江流域浅层滑坡多发区两种典型修复树种刺槐(Robinia pseudoacacia)和毛白杨(Populus tomentosa)为研究对象,通过剖面网格法计算不同树种根系的根截面积比(RAR), 采用万能试验机分析不同根系径级单根抗拉特征,并运用RWM模型计算两种乔木根系对土壤抗剪强度的增加值。结果表明,两种乔木根系的RAR值,刺槐(0.18%)和杨树(0.51%)均大于发挥固坡效应的阈值(0.1%)。两种乔木的单根抗拉力(TF)随着直径的增加而增大,分布规律表现出明显的幂函数特征,TFR.pseudoacacia(363.6 N)<TFP.tomentosa(419.95 N); 刺槐根系的抗拉强度(TS)与根系直径正相关,杨树根系与直径呈负相关关系,且TSR.pseudoacacia(25.38 MPa)<TS P.tomentosa(27.62 MPa)。RWM模型计算得到根系对土壤抗剪强度的增加值为刺槐(21.93 Kpa)<杨树(67.61 Kpa)。在研究区,两种乔木植物根系均能有效增加土壤抗剪强度,杨树根系的固坡效应优于刺槐,研究结果可为浅层滑坡多发区植被根系固土模型的应用和生物工程减灾效果的评价提供一定理论依据。
Abstract:
In order to reveal the differences in the application of ecological restoration plant roots on the reinforcement effect on soil strength and slope stabilization, the study focused on the biotechnical characteristics of Robinia pseudoacacia and Populus tomentosa roots on soil reinforcement effect.Field investigations were conducted to estimate the root area ratio(RAR)in vertical soil profile.Laboratory tests were performed to measure the root tensile force(TF)and the root tensile strength(TS).The root additional shear strength was determined by Revised Wu-waldron(RWM)model.The results indicated that RAR distribution differed significantly with root architecture and was strongly related to soil depth and spatial distribution, while the RAR of Robinia pseudoacacia(0.18%)and Populus tomentosa(0.51%)were greater than the limitation of slope reinforcement(0.1%).Both tension force(TF)increased with the increasing of root diameter, showing with power function features significantly with TFR.pseudoacacia(363.6 N)< TFP.tomentosa(419.95 N).But the tensile strength(TS)for both root systems didn't show similar trend with TSR.pseudoacacia(25.38 Mpa)< TS P.tomentosa(27.62 Mpa).The root additional shear strength calculated by RWM model showed that R.pseudoacacia(21.93 Kpa)<P.tomentosa(67.61 Kpa).In the study area, the two arbor root systems improved the slope stability effectively and increased the soil shear strength significantly, Populus tomentosa root system had more effectiveness of reinforcement for soil stability than Robinia pseudoacacia root system.The study could provide theoretical basis and the practical evaluation for biological engineering effect on superficial landslide area.

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备注/Memo

备注/Memo:
收稿日期(Received date):2017-6-26; 改回日期(Accept date): 2017-11-20
基金项目(Foundation item):国家自然科学基金(NSFC41572332); 甘肃省重点研发计划(17YF1FA131); 兰州大学西部环境教育部重点实验室开放基金及兰州大学科研业务费专项资金(lzujbky-2016-bt01)。[National Nature Science Foundation of China(NSFC41572332); Key Research and Development Program of Gansu Province(17YF1FA131); Open Foundation of MOE Key Laboratory of Western China's Environmental Systems, Lanzhou University(lzujbky-2016-bt01)]
作者简介(Biography):洪苗苗(1989-),女,硕士研究生,主要研究方向:环境灾害与生态修复。[Hong Miaomiao(1989-),femal, M.Sc, candidate, research on environmental disaster and ecological restoration] Email:hongmm15@lzu.edu.cn
*通讯作者(Corresponding author):汪 霞(1976-),女,博士,副教授,主要研究方向:环境灾害与生态修复。[Wang Xia(1976-),female, Ph.D., associate professor, research on environmental disaster and ecological restoration] E-mail:wangxia@lzu.edu.cn
更新日期/Last Update: 2018-01-30