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The influence of plant root system architectural properties upon the stability of loess hillslopes,Northeast Qinghai,China

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Journal of Mountain Science 2016年第5期13卷 785-801页

作者： FU Jiang-tao HU Xia-song BRIERLEY Gary QIAO Na YU Qin-qin LU Hai-jing LI Guo-rong ZHU Hai-li Qinghai Institute of Salt Lakes Chinese Academy of SciencesXiningQinghai810008China University of ChineseAcademy of Sciences Beijing100049China Department of C-eological Engineering Oinghai UniversityXiningQinghai810016China School of Environment University of AucklandPrivate Bag 92019Auckland City 1142New Zealand

To investigate the influence of root system architectural properties of three indigenous （cold- adapted） shrubs on the hillslope stability of loess deposits in the Xining Basin, northeast part of Qinghai-Tibet Plateau （QTP）, indoor direct shear tests have been conducted on the remolded rooted soil of three shrubs. Test results show that root system architectural indices （root area ratio （RAR）, root length density （RLD） and root density （RD）） of the shrubs decline with depth and the relationship between RAR, RD and depth is exponential, while a power relationship describes the relationship between RLD and depth. The cohesion force of remolded rooted soil for the shrubs initially increases with depth, but it then demonstrates a slightly decreasing trend, which can be described with a power relationship. Power relationships also describe relationships between cohesion force and RAR, RLD and RD for the shrubs. As the growth period increases from lO to 17 months, the incremental increase in RAR is 48.32% ~ 21o.25% for Caragana korshinskii Kom and 0.56% ~ 166.85% for ZygophyUum xanthoxylon （Bunge） Maxim. This proportional increase is notably larger than that for RLD and RD. The increment in RAR is marginally greater for C. korshinskff than it is for Z. xanthoxylon. Correspondingly, the cohesion force incremental rates of remolded rooted soil for C. korshinskii and Z. xanthoxylon are 12.41% ~ 25.22% and 3.45% ~ 17.33% respectively. Meanwhile, as root content increases, the contribution by roots to cohesion force increases markedly until a threshold condition is reached.

关键词： Cold region Semiarid region Soil reinforcement hillslope stability Root system architectural indices Plateau

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