马蔺根系固土护坡效应研究
Effects of Roots of Iris Lactea Pall.Var.Chinensis(Fisch.)Koidz.on Soil Reinforcement and Slope Protection 
投稿时间:2021-03-10  修订日期:2021-04-25
DOI:10.12119/j.yhyj.202203011
中文关键词:  马 蔺  生长特征  单根抗拉特性  根—土复合体  固土护坡
英文关键词:Iris lactea Pall.var.chinensis(Fisch.)Koidz.  Growth characteristics  Single root tensile properties  Rooted soil  Soil reinforcement and slope protection
基金项目:国家自然科学基金资助项目(42002283,42062019);第二次青藏高原综合科学考察研究项目(2019QZKK0905);青海大学地质资源与地质工程重点学科建设项目(41250103)
作者单位E-mail
石川 青海大学 地质工程系,青海 西宁 810016 shichuanwj@163.com 
李湘 青海大学 地质工程系,青海 西宁 810016  
余冬梅 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
青海省盐湖地质与环境重点实验室,青海 西宁 810008 
 
马政 青海大学 地质工程系,青海 西宁 810016  
吉海龙 青海大学 地质工程系,青海 西宁 810016  
王芃 青海大学 地质工程系,青海 西宁 810016  
刘亚斌 青海大学 地质工程系,青海 西宁 810016  
胡夏嵩 青海大学 地质工程系,青海 西宁 810016  
朱海丽 青海大学 地质工程系,青海 西宁 810016  
李国荣 青海大学 地质工程系,青海 西宁 810016  
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中文摘要:
      研究以青藏高原东北部观赏地被植物马蔺为研究对象,通过野外调查和材料力学、土力学试验,定量评价了野生马蔺植株和根系生长特征、单根抗拉特性以及根系对土体抗剪强度的增强效应。结果表明,马蔺平均株高、冠幅和植株密度分别为(75.22±11.40)cm、(106.09±25.62)cm和(1.51±0.55)株/m2;马蔺标准株根系分布深度可达50 cm,主要分布在0~30 cm深度范围内,根幅约40~50 cm。马蔺根径为0.20~0.70 mm,单根抗拉力、抗拉强度和延伸率平均值分别为(7.94±2.91)N,(46.30±11.06)MPa和54.17%±17.08%。随着根径的增大,单根抗拉力和单根抗拉强度分别呈幂函数增大和幂函数降低趋势,单根极限延伸率随着根径的增大呈逐渐增大变化趋势,但二者之间未表现出相对显著性的关系。马蔺根系对土体黏聚力和内摩擦角均有增强作用,可分别显著增强0~30 cm和0~10 cm深度范围内土体黏聚力和内摩擦角,增长率分别为9.48%~17.40%和7.62%。本文研究成果对马蔺用于坡面水土流失、浅层滑坡等地质灾害现象的生态防护工作,具有实际指导意义。
英文摘要:
      In order to select ideal plant for slope protection in Northeast Qinghai Tibet Plateau,and promoting both practicality and ornamental development of slope protection by vegetation.In this study,the ornamental ground cover plant Iris lactea Pall.var.chinensis(Fisch.)Koidz.was selected as the research object.The plant characteristics,root distribution characteristics,single root tensile properties and the effects of roots on soil reinforcement of Iris lactea were evaluated quantitatively via field survey,the single root tensile test and the remolded triaxial compression test.The average plant height,crown width and plant density of Iris lactea are 5.22±11.40 cm,106.09±25.62 cm and 1.51±0.55 plants/m2,respectively.The root distribution depth of standard plant of Iris lactea can reach 50 cm below the ground,mainly in the depth range of 0~30 cm,and the root width is about 40~50 cm.The root diameter of Iris lactea ranged from 0.20 mm to 0.70 mm.The average values of single root tensile force,single root tensile strength and single root limit extensile rate of Iris lactea are 7.94±2.91 N,46.30±11.06 MPa and 54.17%±17.08%,respectively.In addition,when the root diameter is 0.20 to 0.70 mm,the single root tensile forces of Iris lactea increase with the root diameter increasing,with a power relationship between single root tensile forces and root diameters.Meanwhile,the single root tensile strengths of Iris lactea increase with the root diameter decreasing,and a power relationship exists between single root tensile strengths and root diameters;moreover,the single root limit extensile rate of Iris lactea increases with the increasing of the root diameter,but there is no significant functional relationship between them.The roots of Iris lactea can enhance both of the cohesion and the internal friction angle of soil.The roots of Iris lactea can significantly enhance the soil cohesion and internal friction angle in the depth range of 0~30 cm(The growth rate of the cohesion is 9.48%~17.40%)and 0~10 cm(The growth rate of the internal friction angle is 7.62%)respectively,and the enhancement effect on the soil cohesion is more significant.The results of this study have theoretical research value and practical guiding significance for the selection of the ornamental ground cover plant Iris lactea for the ecological protection of soil erosion,shallow landslides and other geological disaster phenomena in the study area.
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