信南高速不同类型坡面下边坡植物根系抗拉特性-《西北林学院学报》

文章信息/Info

Title:: Mechanical Properties of Plant Roots in Different Types of Highway Slope along Xinyang-Nanyang

Author(s):: LI Peng-fei; LYV Ruo-bing; HE Huan-yu; CAO Wei; ZHOU Xin; TIAN Guo-hang^*; (College of Forestry,Henan Agricultural University,Zhengzhou,Henan 450002,China)

Keywords:: root system; tensile properties; slope aspect; slope position; the slope vegetation

摘要:: 通过对信（阳）南（阳）高速公路不同坡位、坡向植物根系在不同生长阶段及主根与侧根处的根系力学特性的研究，对于了解根系固土机理及水土保持具有理论实践意义。采用相关分析和回归分析的方法，分析不同类型坡面下植物根系的抗拉特性。结果表明：在不同的生长阶段，多年生草本进入夏季抗拉力达到最大值，冬季呈明显递减趋势；灌木进入冬季则呈缓慢递增趋势；中、下坡植物抗拉力多大于上坡；阳坡植物根系的抗拉强度、根系直径均大于阴坡；阴坡植物根系抗拉力均大于阳坡，根系发育良好；草本植物的主根抗拉力均大于侧根；根系抗拉力和直径呈显著的正幂函数关系，根系抗拉强度和直径呈显著的负幂函数关系。研究结果对根系固土力学机制的研究提供了理论基础。

Abstract:: It is of theoretical and practical magnificence to study the mechanical properties of the roots of the vegetations at different developmental stages and growing in different slopes along the Xinyang-Nangyang Highway.Correlation analysis and regression analysis were adopted to study the relationship of tensile properties between vegetation root system under different types of slopes.The results showed that,at different growth stages,the tensile resistance of perennial herb reached its maximum in summer,and appeared a decreasing trend in winter; the tensile resistance of shrubs slowed an increasing trend in winter.The tensile resistance of vegetation roots on middle and low slopes was greater than those on uphill bit.The tensile resistance root tensile strength and root diameter of sunny slope vegetation were larger than shady slope; the tensile resistance of shady slope were larger than the sunny slope with good root development.The tensile strength of herbaceous plants at taproots was greater than that at lateral roots.Significantly positive power function relationship was found between root tensile strength and diameter and significantly negative power function relationship between root tensile strength and diameter.The results would provide a theoretical basis for research on root soil reinforcement mechanism.