Acta Agrestia Sinica

Acta Agrestia Sinica ›› 2023, Vol. 31 ›› Issue (1): 157-165.DOI: 10.11733/j.issn.1007-0435.2023.01.018

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Study on the Characteristics and Influence Factors of Root Pull-out Resistance of Six Grasses in the Source Region of the Yellow River

WANG Cheng1, HU Xia-song1, LIU Chang-yi1, LI Xi-lai2, FU Jiang-tao3, LU Hai-jing2, ZHAO Ji-mei2, XING Guang-yan2, HE Wei-peng1, YANG Fu-cheng1, LI Guo-rong1   

  1. 1. Department of Geological Engineering, Qinghai University, Xining, Qinghai Province 810016, China;
    2. School of Agriculture and Animal Husbandry, Qinghai University, Xining, Qinghai Province 810016, China;
    3. Academy of Agriculture and Forestry Sciences, Qinghai University, Xining, Qinghai Province 810016, China
  • Received:2022-07-01 Revised:2022-10-02 Online:2023-01-15 Published:2023-02-07

黄河源区六种草本植物根系抗拔力特征及其影响因素研究

王程1, 胡夏嵩1, 刘昌义1, 李希来2, 付江涛3, 卢海静2, 赵吉美2, 邢光延2, 何伟鹏1, 杨馥铖1, 李国荣1   

  1. 1. 青海大学地质工程系, 青海 西宁 810016;
    2. 青海大学农牧学院, 青海 西宁 810016;
    3. 青海大学农林科学院, 青海 西宁 810016
  • 通讯作者: 刘昌义, E-mail:1358128151@qq.com
  • 作者简介:王程(1994-)，男，汉族，硕士研究生，主要从事地质工程与地质灾害防治研究，E-mail:3234252189@qq.com
  • 基金资助:
    国家自然科学基金资助项目(42041006)；第二次青藏高原综合科学考察研究项目(2019QZKK0905)；青海省自然科学基金资助项目(2020-ZJ-906；2020-ZJ-904)；青海大学地质资源与地质工程硕士学位点建设项目(41250103)；高等学校学科创新引智计划项目(D18013)资助

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Abstract: To investigate the characteristics of plant root pull-out resistance of alpine grassland in the source region of the Yellow River,six dominant grass species were selected from the alpine grassland in the source region of the Yellow River in Henan County,Qinghai Province. Through in-situ pull-out test,single root tensile test and root-soil composite system direct shear test,the root pull-out resistance characteristics of six grasses were analyzed. The comprehensive effects of root diameter,root number,root length,soil density,moisture content,compactness,root content,single root tensile strength and cohesion of root-soil composite system on pull-out resistance were investigated. The results showed that:the root pull-out resistance of Kobresia humilis K. was the highest (46.50 N),followed by Kobresia pygmaea C. B. Clarke. (37.50 N),Poa crymophila Keng. was the smallest (16.45 N). There was a significant positive correlation between root diameter,root number,root length and root pull-out resistance,with correlation coefficients (R) of 0.881,0.727,and 0.969,respectively. There was a positive correlation between soil density,soil compactness,root content,cohesion of root-soil composite system and root pull-out resistance,and a negative correlation between moisture content and root pull-out resistance. The results of this study provide theoretical guidance for exploring the mechanical mechanism of alpine grassland degradation in the source region of the Yellow River,and provide theoretical basis and practical guidance for effectively preventing and controlling of grassland degradation,soil erosion and other shallow surface disasters in the region.

Key words: The source region of the Yellow River, Alpine grassland, Plant roots, Pull-out resistance, Root-soil composite system

摘要： 为探讨黄河源区高寒草地植物根系抗拔力特性，本研究选取青海河南县高寒草地6种优势草本为研究对象，通过原位拉拔、单根拉伸、根-土复合体直接剪切等试验，分析6种植物根系抗拔力特性，探讨植物根径、根数、根长和土体密度、含水率、紧实度、含根量及单根抗拉强度、根-土复合体黏聚力等9种因素对植物根系抗拔力的综合影响。结果表明：6种草本根系抗拔力以矮嵩草(Kobresia humilis K.)最大(46.50 N)，高山嵩草(Kobresia pygmaea C. B. Clarke.)次之(37.50 N)，冷地早熟禾(Poa crymophila Keng.)最小(16.45 N)；根系抗拔力与根径、根数、根长间呈显著正相关(P<0.05)，相关系数(R)为0.881，0.727，0.969，与土体密度、紧实度、含根量、根-土复合体黏聚力间呈正相关，与含水率呈负相关。研究结果对探讨黄河源区高寒草地退化力学机理具有理论指导作用，为有效防治区内草地退化、水土流失等地表浅层灾害发生提供理论依据和实际指导。

关键词: 黄河源区, 高寒草地, 抗拔力, 植物根系, 根-土复合体

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