摘要
选取泸定大渡河干热河谷区6种优势本土灌草植物,包括2种灌木[假杜鹃(Barleria cristata)和木蓝(Indigofera tinctoria)]和4种草本[鬼针草(Bidens pilosa)、黄茅(Heteropogon contortus)、艾草(Artemisia argyi)和两头毛(Incarvillea arguta),开展根系拉伸试验,测试其单根抗拉力学特性并分析其与根系特征的关联。结果显示:1)灌木单根的极限抗拉力高于草本。灌木和草本单根的极限抗拉强度差异不显著,具体表现为:黄茅>鬼针草>木蓝>假杜鹃>艾草>两头毛。灌木单根的弹性模量高于草本,具体表现为:假杜鹃>木蓝>鬼针草>黄茅>艾草>两头毛)。2)根系特征(根长和根系直径)对6种优势植物抗拉力学特性有重要的影响,物种间差异较大。就极限抗拉力而言,6种植物单根的极限抗拉力均与其根径呈极显著正相关,仅两头毛和木蓝的极限抗拉力还与根长呈极显著正相关。就极限抗拉强度而言,6种植物的极限抗拉强度均随根径的增大呈线性递减,仅假杜鹃的极限抗拉强度还与根长呈显著正相关。就弹性模量而言,6种植物单根的弹性模量均随根径的增加而显著减小,但随根长的增大而显著增加。总体而言,草本黄茅、鬼针草和灌木假杜鹃植物根系的抗拉力学特性最优,可在当地优先搭配推广使用。
In order to select the best indigenous plant for soil consolidation and skid resistance in the dry-hot valley of western Sichuan,six dominant indigenous plants were selected from the dry-hot valley of the Dadu River in Luding county,and to implement the root tensile experiment to test their tensile mechanical properties and analyze their correlation with root characteristics.The results showed that:1)The ultimate tensile resistance of shrub roots was higher than that of herbs,as follows:Indigofera tinctoria>Barleria cristata>Incarvillea arguta>Artemisia argyi>Heteropogon contortus>Bidens pilosa.The ultimate tensile strength of root was no significant differences between shrub and herbs roots,as follows:Heteropogon contortus>Bidens pilosa>Indigofera tinctoria>Barleria cristata>Artemisia argyi>Incarvillea arguta.The elasticity modulus of shrubs roots was higher than that of herbs,as follows:Barleria cristata>Indigofera tinctoria>Bidens pilosa>Heteropogon contortus>Artemisia argyi>Incarvillea arguta.2)Root length and root diameter of the six dominant plants had an important influence on the tensile mechanical properties,with large differences among species.The ultimate tensile resistance of six species roots was significantly and positively correlated with their root diameter,but only the ultimate tensile resistance of Incarvillea arguta and Indigofera tinctoria was also significantly and positively correlated with root length.All six plants showed a linear decrease in ultimate tensile strength with the increasing root diameter,but only the ultimate tensile strength of Barleria cristata was also significantly positively correlated with root length.The elasticity modulus decreased significantly with the increasing root diameter,but increased significantly with the increasing root length.In addition,the effect of root length on the elasticity modulus of shrub roots was more significant than that of herbs.Overall,the roots of Barleria cristata,Bidens pilosa,and Heteropogon contortus have the optimal tensile mechanical properties and can be popularly used in the dry-hot valley of western Sichuan.
作者
冯旭环
周璐
熊伟
宗桦
FENG Xuhuan;ZHOU Lu;XIONG Wei;ZONG Hua(Department of Landscape,Southwest Jiaotong University,Chengdu 611756;China Railway Eryuan Engineering Group Co.LTD,Chengdu 610031;Sichuan Vocational Technical College of Communications,Chengdu 611130,China)
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2023年第7期159-169,共11页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金面上项目(31971716)
成都市科技局技术创新研发项目(2021-YF05-00033-SN)
成都市中铁二院横向项目(KYY2019132)资助。
关键词
干热河谷
本土植物
根系
固土防滑
抗拉特性
The dry-hot valley
indigenous plant
roots
soil consolidation and skid resistance
tensile mechanical properties
作者简介
冯旭环(1997-),女,汉族,四川宜宾人,硕士研究生,主要从事园林植物生态学的研究。E-mail:fxuhuan@163.com;通讯作者:宗桦(1981-),女,汉族,四川宜宾人,教授,主要从事植物生态研究。E-mail:zonghua@swjtu.edu.cn
