Acta Agrestia Sinica

Acta Agrestia Sinica ›› 2019, Vol. 27 ›› Issue (1): 43-52.DOI: 10.11733/j.issn.1007-0435.2019.01.007

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Research on the Effect of Plant Combination Types on the Shear Strength of the Root-soil Composite System of Alpine Grassland in the Source Region of the Yellow River

LIU Chang-yi1, DOU Zeng-ning2, HU Xia-song1,3,4, XU Zhi-wen1, ZHOU Lin-hu1, LI Xi-lai5, ZHU Hai-li1, LI Yan-ting1   

  1. 1. Department of Geological Engineering, Qinghai University, Xining, Qinghai Province 810016, China;
    2. Qinghai Province Highway Research Survey and Design Institute, Xining, Qinghai Province 810001, China;
    3. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai Province 810008, China;
    4. Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes, Xining, Qinghai Province 810008, China;
    5. College of Agriculture and Animal Husbandry, Qinghai University, Xining, Qinghai Province 810016, China
  • Received:2018-03-22 Revised:2018-10-31 Online:2019-02-15 Published:2019-04-13

黄河源区高寒草地植物组合对根-土复合体抗剪强度的影响

刘昌义1, 窦增宁2, 胡夏嵩1,3,4, 徐志闻1, 周林虎1, 李希来5, 朱海丽1, 李燕婷1   

  1. 1. 青海大学地质工程系, 青海 西宁 810016;
    2. 青海省公路科研勘测设计院, 青海 西宁 810001;
    3. 中国科学院青海盐湖研究所, 中国科学院盐湖资源综合高效利用重点实验室, 青海 西宁 810008;
    4. 青海省盐湖地质与环境重点实验室, 青海 西宁 810008;
    5. 青海大学农牧学院, 青海 西宁 810016
  • 通讯作者: 胡夏嵩,E-mail:huxiasong@tsinghua.org.cn
  • 作者简介:刘昌义(1991-),男,硕士,实验员,主要从事地质工程等方面研究。E-mail:1358128151@qq.com
  • 基金资助:
    国家自然科学基金资助项目（41572306）；青海大学地质资源与地质工程重点学科资助项目（41020105）；教育部"长江学者和创新团队"资助项目（IRT_17R62）资助

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Abstract: In this study,an alpine grassland in Henan County,Qinghai Province,in the source region of the Yellow River,was selected as the study area. The shear strength of root-soil composite system characteristics of 6 different plant combination types of grassland were explored by field investigation and sampling and indoor tests,which aimed to provide a theoretical basis for preventing and controlling soil erosion and shallow landslide caused by grassland degradation. The test results showed that the shear strength of root-soil composite system of 6 different combinations was a increasing trend with the decrease of altitude. Namely,the shear strength of the root-soil composite system of Stipa purpurea Griseb. + Kobresia pygmaea C. B. Clarke at the top of the sunny slope was 27.76 kPa and the value of Elymus nutans Griseb. at the bottom of the sunny slope was 37.53 kPa. The reasons why the shear strength of 6 kinds of combinations varied from large to small with the decrease of altitude were related to their density,moisture content,root content and dry weight of roots in the root-soil composite system samples. That is,the root content of composite system at the top,middle and bottom of the sunny slope were 6.2%,5.5% and 16.2%,respectively. The values at the top,middle and bottom of the shady slope were 8.0%,11.4% and 31.6%,respectively.

Key words: The Source Region of the Yellow River, Alpine Grassland, Root-soil Composite System, Shear Strength, Water and Soil Loss

摘要： 以位于黄河源区的青海河南县境内高寒草地作为研究区，通过野外现场勘察与取样及室内试验，探讨了区内6种不同植物组合类型草地的植物根-土复合体抗剪强度特征，旨在为防治草地退化引起的水土流失、浅层滑坡等灾害现象发生提供理论依据。结果表明：6种组合类型的根-土复合体抗剪强度随海拔高度降低而呈逐渐增大的变化趋势，即阳坡坡顶位置处紫花针茅（Stipa purpurea Griseb.）+高山嵩草（Kobresia pygmaea C.B.Clarke）组合的根-土复合体抗剪强度为27.76 kPa，至阳坡坡底位置处的垂穗披碱草（Elymus nutans Griseb.）其根-土复合体抗剪强度为37.53 kPa；从坡顶至坡底6种植物根-土复合体抗剪强度由小至大变化规律，与根-土复合体试样密度、含水率、根系干重等因素有关，即阳坡坡顶、坡中和坡底处根系平均含量分别为6.2%，5.5%和16.2%；阴坡坡顶、坡中、坡底处根系平均含量分别为8.0%，11.4%和31.6%。

关键词: 黄河源区, 高寒草地, 根-土复合体, 抗剪强度, 水土流失

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