[1]李光莹,虎啸天,李希来,等.黄河源玛沁地区高寒草地植物固土护坡的力学效应[J].山地学报,2014,(05):550.
　LI Guangying,HU Xiaotian,LI Xilai,et al.Mechanical Effects of Alpine Grassland Plants in Slope Protection in Maqin County of the Source Area of the Yellow River[J].Mountain Research,2014,(05):550.
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黄河源玛沁地区高寒草地植物固土护坡的力学效应()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2014年05期
页码:
550
栏目:
山地环境
出版日期:
2014-05-15

文章信息/Info

Title:
Mechanical Effects of Alpine Grassland Plants in Slope Protection in Maqin County of the Source Area of the Yellow River
作者:
李光莹; 虎啸天; 李希来; 余冬梅; 付江涛; 朱海丽; 胡夏嵩
1. 中国科学院 青海盐湖研究所，青海 西宁 810008；
2. 青海大学，青海 西宁 810016
Author(s):
LI Guangying; HU Xiaotian;  LI Xilai;  YU Dongmei; FU Jiangtao; ZHU Haili; HU Xiasong
1. Qinghai Institute of Salt Lakes，Chinese Academy of Sciences，Xining，810008 Qinghai，China； 　　
2. Qinghai University，Xining，810016 Qinghai，China
关键词:
黄河源区; 高寒草地; 植物护坡; 根-土复合体; 抗拉强度; 抗剪强度; 力学效应
Keywords:
the source area of the Yellow River;  alpine grassland;  slope protection with vegetation;  rootsoil composite systems;  tensile strength;  shear strength;  mechanical effects
分类号:
S157.1
文献标志码:
A
摘要:
通过对试验区草本植物根系的力学强度试验，研究了黄河源玛沁地区高寒草地植物护坡的力学效应，即通过研究未退化、轻度退化、重度退化的草地的主要优势种植物的单根抗拉力、抗拉强度和根-土复合体的抗剪强度等评价其固土护坡能力与贡献。研究所选取的未退化草地的优势种植物主要有小嵩草（Kobresia pygmaea C.B.Clarke）、紫花针茅（Stipa purpurea Griseb.），轻度退化草地的优势种植物包括矮火绒草（Leontopodium nanum (Hook. f. et Thoms.) Hand.-Mazz.）、二裂委陵菜（Potentilla bifurca L.），重度退化草地的优势种植物为细叶亚菊（Ajania tenuifolia (Jacq.) Tzvel.）、盐地风毛菊（Saussurea salsa (Pall) Spreng）。由单根拉伸试验结果表明，单根抗拉强度平均值由大至小依次为紫花针茅>小嵩草>矮火绒草>二裂委陵菜>细叶亚菊>盐地风毛菊；室内根-土复合体原状试样直接剪切试验表明，根-土复合体的抗剪强度由大至小依次为小嵩草>紫花针茅>矮火绒草>二裂委陵菜>细叶亚菊>盐地风毛菊。研究成果对进一步探讨黄河源高寒地区植物固土护坡机理，以及试验区及其与试验区条件相似的其他地区，科学防治坡面水土流失、浅层滑坡等地质灾害的发生具有重要理论指导意义。
Abstract:
Mechanical strength tests have been conducted on grass roots of alpine grassland plants in Maqin County to study their mechanical effects in soil fixation and slope protection in the source area of the Yellow River. Three representative sampling plots were selected according to the degradation degrees which were marked as nondegraded grassland, lightly degraded grassland and heavily degraded grassland. The root tensile strength and shear strength of the dominant plants in this alpine grassland was studied to estimate the contribution to soil fixation and slope protection. The selected dominant plants in nondegraded grassland were Kobresia pygmaea C.B.Clarke and Stipa purpurea Griseb., in lightly degraded grassland Leontopodium nanum (Hook. f. et Thoms.) Hand.-Mazz. and Ajania tenuifolia (Jacq.) Tzvel were chosen, Potentilla bifurca L. and Saussurea arenaria Maxim were the dominant in heavily degraded grassland. The result of single root tensile test shows that the descending order of single root strength of these plants is Stipa purpurea Griseb.>Kobresia pygmaea C.B.Clarke>Leontopodium nanum (Hook. f. et Thoms.) Hand.-Mazz.>Potentilla bifurca L.> Ajania tenuifolia (Jacq.) Tzvel.>Saussurea salsa (Pall) Spreng, while the result of direct shear test shows that the descending order of rootsoil composite systems shear strength is Kobresia pygmaea C.B.Clarke>Stipa purpurea Griseb.>Leontopodium nanum (Hook. f. et Thoms.) Hand.-Mazz.>Potentilla bifurca L.> Ajania tenuifolia (Jacq.) Tzvel>Saussurea salsa (Pall) Spreng. The study has theoretical significance in investigating the mechanism of the alpine grassland plants for slope protection and in prevention and control of geological disasters such as water and soil loss, and shallow landslide in the region and other regions with the similar environmental conditions.

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备注/Memo

备注/Memo:
收稿日期(Received date)：2013-10-10；修回日期（Accepted）：2014-02-18。
基金项目（Foundation item）：国家国际科技合作计划资助项目(2011DFG93160); 国家自然科学基金资助项目(41162010，41302258); 长安大学西部矿产资源与地质工程教育部重点实验室开放基金资助(CHD2011SY016)。
作者简介（Biography）：李光莹（1989 -），男，硕士研究生，主要从事地质工程等方面的研究工作。\[Li Guangying(1989-), male, postgraduate, major in Geological Engineering.\] E-mail：liguangying11@mails.ucas.cn *
通信作者(Corresponding author): 胡夏嵩（1965-），男，教授。\[Hu Xiasong(1965-), male, professor, major in Geological Engineering.\] E-mail：hxs@mail.tsinghua.edu.cn
更新日期/Last Update: 1900-01-01