An Exploratory Analysis of Vegetation Strategies to Reduce Shallow Landslide Activity on Loess Hillslopes, Northeast Qinghai-Tibet Plateau, China

查看全文 作　　者：HU Xia-[1,2]song;BRIERLEY [3]Gary;ZHU Hai-[1]li;LI Guo-[1]rong;FU Jiang-[2]tao;MAO Xiao-[1]qing;YU Qin-[1]qin;QIAO [1]Na

机构地区：[1]Department of Geological Engineering, Qinghai University;[2]Qinghai Institute of Salt Lakes, Chinese Academy of Sciences;[3]School of Environment, University of Auckland, Private Bag 92019, Auckland City 1142,New Zealand

出　　处：《Journal of Mountain Science》索引2013年第10卷第4期,共19页

基　　金：financially supported by the National Natural Science Foundation of China(Grant No.41162010);Excellent Talents in University of New Century by Ministry of Education of the People's Republic of China(Grant No.NCET-04-G983);International Science & Technology Cooperation Program of China(Grant No.2011DFG93160) 摘　　要：Heavy summer rainfall induces significant soil erosion and shallow landslide activity on the loess hillslopes of the Xining Basin at the northeast margin of the Qinghai-Tibet Plateau. This study examines the mechanical effects of five native shrubs that can be used to reduce shallow landslide activity. We measured single root tensile resistance and shear resistance, root anatomical structure and direct shear and triaxial shear for soil without roots and five root- soil composite systems. Results show that Atriplex canescens (Pursh) Nutt. possessed the strongest roots, followed by Caragana korshinskii Kom., Zygophyllum xanthoxylon (Bunge) Maxim., Nitraria tangutorum Bobr. and Lycium chinense Mill. Single root strength and shear resistance relationships with root diameter are characterized by power or exponential relations, consistent with the Mohr- Coulomb law. Root mechanical strength reflects their anatomical structure, especially the percentage of phloem and xylem cells, and the degree and speed of periderm lignifications. The cohesion force of root- soil composite systems is notably higher than that of soil without roots, with increasing amplitudes of cohesion force for A. canescens, C. korshinskii, Z. xanthoxylon, N. tangutorum and L. chinense of 75.9%, 75.1%, 36.2%, 24.6% and 17.0 % respectively. When subjected to shear forces, the soil without root samples show much greater lateral deformation thanthe root-soil composite systems, reflecting the restraining effects of roots. Findings from this paper indicate that efforts to reduce shallow landslides in this region by enhancing root reinforcement will be achieved most effectively using A. canescens and C. korshinskii. 关键词：青藏高原东北缘浅层滑坡黄土中国植被复合系统四翅滨藜滑坡活动

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An Exploratory Analysis of Vegetation Strategies to Reduce Shallow Landslide Activity on Loess Hillslopes, Northeast Qinghai-Tibet Plateau, China

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