多花木蓝和双荚决明在稳定边坡和生态修复上具有积极作用,为研究其边坡防护机理,以4 a生多花木蓝和双荚决明根-土界面摩擦为切入点,探讨根系表观形貌、凹凸度对根-土界面摩擦强度的影响。结果表明:①多花木蓝根皮以沟壑型为主,而双荚决明则以栅格型为主,且随根径的增大,这一现象越趋明显;②根皮凹凸度随根径的增加而增大,根径由1 mm增加到5 mm时,多花木蓝根皮凹凸度从0.26增加到0.48,双荚决明从0.24增加到0.66;③根表皮呈格栅型的根-土摩擦强度较优,且凹凸度越大,根-土摩擦强度越大。研究围绕根皮微观形貌-凹凸度定量-试验验证来探讨根-土界面摩擦特性,建立根皮微观结构与根皮宏观摩擦剪切的关系,对于根系固土护坡力学特性的研究具有重要意义。
Abstract
As common tree species,Indigofera amblyantha and Cassia bicapsularis have positive effects on slop stability and ecological restoration.To study their mechanism of slope protection,we investigated the influences of apparent morphology and roughness of roots on frictional strength of root-soil interface of 4-year age Indigofera amblyantha and Cassia bicapsularis.Results showed that:1)Grooves dominate the root skin of Indigofera amblyantha,and grids prevail on the root skin of Cassia bicapsularis.With the increase of root diameter,such apparent morphology grows more obvious.2)The roughness of root surface increases with the expansion of root diameter.When root diameter expands from 1 mm to 5 mm,the roughness of Indigofera amblyantha increases from 0.26 to 0.48,while that of Cassia bicapsularis from 0.24 to 0.66.3)Root with grid skin morphology has larger frictional strength on the root-soil interface,and the greater the roughness,the larger the frictional strength of root-soil interface.According to the micromorphology and quantified roughness as well as test verification,we established the relationship between the microstructure of root skin and the macroscopic friction and shear of root-soil interface.The research finding is of great significance for the study of the mechanical properties of slope protection by root system.
关键词
根系 /
界面摩擦特性 /
凹凸度 /
微观形貌 /
多花木蓝 /
双荚决明
Key words
root /
friction characteristic of root-soil interface /
root surface roughness /
microstructure /
Indigofera amblyantha /
Cassia bicapsularis
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参考文献
[1] BISCHETTI G B,CHIARADIA E A,EPIS T,et al.Root Cohesion of Forest Species in the Italian Alps[J].Plant & Soil,2009,324(1/2):71-89.
[2] COMMANDEUR P R,PYLES M R.Modulus of Elasticity and Tensile Strength of Douglas-Fir Roots[J].Canadian Journal of Forest Research,1991,21(1):48-52.
[3] SJOSTROM E.Wood Chemistry:Fundamentals and Applications[M].London:Academic Press,1981.
[4] 张乔艳,唐丽霞,潘 露,等.基于根系化学组成的抗拉力学特性分析[J].南京林业大学学报(自然科学版),2020,44(1):186-192.
[5] 蒋坤云,陈丽华,盖小刚,等.华北护坡阔叶树种根系抗拉性能与其微观结构的关系[J].农业工程学报,2013,29(3):115-123.
[6] 刘亚斌,胡夏嵩,余冬梅,等.西宁盆地黄土区2种灌木植物根-土界面微观结构特征及摩擦特性试验[J].岩石力学与工程学报,2018,37(5):1270-1280.
[7] 张乔艳,唐丽霞,廖华刚,等.多花木蓝根截面微观结构对其抗拉特性的影响[J].植物生态学报,2019,43(8):709-717.
[8] ZHANG C,XIA Z,JING J,et al.Root Moisture Content Influence on Root Tensile Tests of Herbaceous Plants[J].Catena,2019,172:140-147.
[9] COFIE P,KOOLEN A J,PERDOK U D.Measurement of Stress-Strain Relationship of Beech Roots and Calculation of the Reinforcement Effect of Tree Roots in Soil-Wheel Systems[J].Soil & Tillage Research,2000,57(1):1-12.
[10]张云伟,惠 尚,卜晓磊,等.3种散生竹的单根抗拉力学特性[J].林业科学,2013,49(7):183-187.
[11]NI J J,LEUNG A K,NG C W W.Influences of Plant Spacingon Root Tensile Strength of Schefflera Arboricola and Soil Shear Strength[J].Landscape and Ecological Engineering,2019,15(2):223-230.
[12]CAPILLERI P P,CUOMO M,MOTTA E,et al.Experimental Investigation of Root Tensile Strength for Slope Stabilization[J].Indian Geotechnical Journal,2019,49(3/4):223-230.
[13]郭京衡,曾凡江,李尝君,等.塔克拉玛干沙漠南缘三种防护林植物根系构型及其生态适应策略[J].植物生态学报,2014,38(1):36-44.
[14]GRAY D H.Influence of Vegetationon the Stability of Slopes[C]∥Proceedings of the International Conference of Vegetation and Slopes:Stabilisation,Protection and Ecology.Oxford,UK.September 29-30,1994:2-25.
[15]吕春娟,陈丽华.华北典型植被根系抗拉力学特性及其与主要化学成分关系[J].农业工程学报,2013,29(23):69-78.
[16]刘福全,刘 静,姚喜军,等.根系固土主导力学因素与差异性评价[J].生态学报,2015,35(19):6306-6315.
[17]ZHOU Y,WATTS D,LI Y H,et al.A Case Study of Effect of Lateral Roots of Pinus Yunnanensis on Shallow Soil Reinforcement[J].Forest Ecology & Management,1998,103(2):107-120.
[18]SCHWARZ M,COHEN D,OR D.Root-Soil Mechanical Interactions during Pullout and Failure of Root Bundles[J].Journal of Geophysical Research Earth Surface,2010,115(F4):F04035:1-F04035:19.
[19]刘亚斌,余冬梅,付江涛,等.黄土区灌木柠条锦鸡儿根-土间摩擦力学机制试验研究[J].农业工程学报,2017,33(10):198-205.
[20]邢会文.4种植物根-土界面摩阻特性研究[D].呼和浩特:内蒙古农业大学,2009.
[21]曹云生,陈丽华,刘小光,等.植物根土界面摩擦力的影响因素研究[J].摩擦学学报,2014,34(5):482-488.
[22]郑力文,刘小光,涂志华,等.油松群根与土壤界面摩擦特性研究[J].水土保持学报,2014,28(1):84-87.
[23]刘小光,赵红华,冀晓东,等.油松和落叶松根与土界面摩擦特性[J].摩擦学学报,2012,32(6):550-556.
[24]刘亚斌,胡夏嵩,余冬梅,等.西宁盆地黄土区2种灌木植物根-土界面微观结构特征及摩擦特性试验[J].岩石力学与工程学报,2018,37(5):1270-1280.
[25]邢会文,刘 静,王林和,等.柠条、沙柳根与土及土与土界面摩擦特性[J].摩擦学学报,2010,30(1):87-91.
[26]田 佳,刘耀辉.华北地区几种常用边坡绿化植物的根系力学特性研究[J].中国水土保持,2007(10):34-36.
[27]夏振尧,刘 琦,许文年,等.多花木蓝根系与土体界面摩阻特征[J].水土保持学报,2018,32(1):128-134.
[28]张乔艳.边坡常见灌木根系抗拉抗剪特性分析[D].贵阳:贵州大学,2020:11-12
[29]赵丽兵,张宝贵.紫花苜蓿和马唐根的生物力学性能及相关因素的试验研究[J].农业工程学报,2007(9):7-12.
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