火的反义词第48卷第1期2020年2月
贵州林业科技
Guizhou Forestry Science and Technology
Vol.48,No.1
Feb.,2020火棘单根抗拉力学特性分析
黎洪江1肖雄2张乔艳1石庆港1唐丽霞-
幼儿园故事比赛(1.贵州大学林学院贵阳550025; 2.关岭布依族苗族自治县林业局贵州关岭561300)
摘要:通过对火棘根系进行拉伸力学特性及根系孔隙度的测定,探究火棘根径、根系含水率和根系孔隙度对抗拉力学的影响。结果表明:火棘根系在土壤自然含水率和饱和含水率时根系抗拉力随根径的增加而增大,
均呈正相关关系。而抗拉强度随根径的增大而减小,二者均成指数函数关系。根截面孔隙度随根径的增加呈减
小的趋势,总体呈对数函数关系。根截面孔隙度的变化在一定程度上解释了随着根径的增大、抗拉强度减小的
怎样提高孩子学习
原因,即根系孔隙度逐渐减少,使得根系截面的有效面积增加,一定程度上使得抗拉强度降低。
关键词:火棘;孔隙度;含水率;抗拉力;抗拉强度
中图分类号:S714.3文献标识码:B
Tensile Machanical Properties of Single Root of Pyracantha fortuneana LI Hong-jiang1XIAO Xiong2ZHANG Qiao-yan1SHI Qing-gang1TANG Li-xia1
(1.College of forestry,Guizhou University,Guiyang,Guizhou550025;
2.Forestry Bureau o£Guanling Buyi and Miao Autonomous County,Guanling,Guizhou561300)
群邑Abstract:The effects of root diameter,water content and porosity on tensile resistance of Pyracantha fortuneana were studied by measuring its tensile mechanical properties and root porosity.The results showed that under the natural water content and saturated water content of Pyracantha fortuneana roots, the root anti一tension incread with the increa of root diameter,which was positively correla
ted.However,the tensile strength decreas with the increa of root diameter,which was an exponential function. The porosity of root cross—ction decread with the increa of root diameter,and the relationship was logarithmic.To some extent,the change of root cross—ction porosity explains that with the increa of root diameter,the tensile porosity,decreas gradually.鸡蛋饺
Key words:Porosity;Water content;Tensile strength
我也是一束阳光作文
火棘根系发达,扎根较深,是良好的水土保持树种闪。植物根系在一定程度上能固结土体,对于减缓浅层滑坡、崩塌等重力侵蚀具有积极作用⑵。此外,根系的抗拉特性是根系固土的重要指标,随着生态护坡技术的不断发展,许多学者针对植物根系的抗拉力学特性进行了研究⑷。结果表明,植物
邢姓的来源
财政危机收稿日期:2019—12—28O
作者简介:黎洪江(1994—),男,本科生。主要研究方向:退化生态系统恢复与重建。E-mail: 通讯作者:唐丽霞(1976—),女,博士,副教授。主要研究方向:水土保持与工程绿化。E-mail:****************项目名称:贵州省科技计划项目“喀斯特区边坡绿化树种的筛选与示范”(黔科合支撑[2016J2612号)