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[1]LI Ke,ZHU Haili,SONG Lu,et al.Relationship Between Tensile Properties and Microstructure of Two Typical Plant Roots in the Qinghai-Tibet Plateau[J].Research of Soil and Water Conservation,2018,25(02):240-249.

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Relationship Between Tensile Properties and Microstructure of Two Typical Plant Roots in the Qinghai-Tibet Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 02 Page number: 240-249 Column: Public date: 2018-04-03

Title:: Relationship Between Tensile Properties and Microstructure of Two Typical Plant Roots in the Qinghai-Tibet Plateau

Author(s):: LI Ke¹, ZHU Haili^1,2, SONG Lu¹, LI Guorong^1,2, XIE Binshan¹, LI Benfeng¹; 1. Department of Geological Engineering, Qinghai University, Xining 810016, China;
2. Key Lab of Cenozoic Resource & Environment in North Margin of the Tibetan Plateau, Xining 810016, China

Keywords:: tensile strength; gauge length; stretching rate; stress-strain curve; SEM

CLC:: S718

DOI:: -

Abstract:: In order to study relationship between the tensile properties of root system and the root microstructure of two common slope protection vegetations in the slope and road cutting of eastern Qinghai-Tibetan Plateau, the single root tensile test and SEM test of Caragana korshinskii Kom. and Poa pratensis L. were carried out to study the tensile properties of root system and its relationship with the microstructure. The results showed that the root tensile resistances of the two plants increase exponentially with the increase of diameter; the tensile strength of roots decreases with the increase follows the diameter as a power function or an exponential function. The average tensile resistance of Poa pratensis L. root reaches its maximum at the 40 mm gauge length, while the average tensile resistance of Caragana korshinskii Kom. root reaches its maximum when the gauge length distance is 80 mm; at different stretching rates, the tensile resistance and tensile strength of two kinds of plant roots reach the maximum under the stretching rate of 3 mm/min, and the tensile strength of two plants under the stretching rate of 5 mm/min and 10 mm/min does not change significantly. The stress-strain curve of two plants shows the single-peak curve without obvious necking phenomenon, and it has the characteristics of elastic-plastic material. The herbs Poa pratensis L. roots with smaller diameter possesses higher tensile strength and greater extension properties. By observing the microscopic structure, the pore diameter of the cross sections of Caragana korshinskii Kom. and Poa pratensis L. decrease with the increase of the stretching rate, the decrease ranges are 91.25% and 45.41%, respectively, and the extent of epidermal destruction accordingly decreases. The extent of epidermal tear and the extent of epidermal elongation in tensile cross section decrease with the increase of stretching rate and elongation.

References:: [1] Wu T H, McKinnell W P Ⅲ, Swanston D N. Strength of tree roots and landslides on Prince of Wales Island, Alaska[J]. Canadian Geotech Journal, 1979,16(1):19-33.
[2] Waldron L J, Dakessian S. Soil reinforcement by roots:Calculation of increased soil shear strength from root properties[J]. Soil Science, 1981,132(6):427-435.
[3] 赵玉娇,胡夏嵩,刘昌义,等.寒旱环境植物根系增强边坡土体抗剪强度试验研究[J].水土保持研究,2016,23(4):212-220.
[4] 栗岳洲,付江涛,余冬梅,等.寒旱环境盐生植物根系固土护坡力学效应及其最优含根量探讨[J].岩石力学与工程学报,2015,34(7):1370-1383.
[5] 乔娜,余芹芹,卢海静,等.寒旱环境植物护坡力学效应与根系化学成分响应[J].水土保持研究,2012,19(3):108-113.
[6] 李刚,赵祥,张宾宾,等.不同株高的柠条生物量分配格局及其估测模型构建[J].草地学报,2014,22(4):769-775.
[7] 贺玺琳,杨慧茹,马玉寿,等.青海草地早熟禾植物量生长动态研究[J].青海畜牧兽医杂志,2016,46(1):13-16.
[8] 熊燕梅,夏汉平,李志安,等.植物根系固坡抗蚀的效应与机理研究进展[J].应用生态学报.2007,18(4):895-904.
[9] 胡夏嵩,李国荣,朱海丽,等.寒旱环境灌木植物根-土相互作用及其护坡力学效应[J].岩石力学与工程学报,2009,28(3):613-620.
[10] 朱海丽,胡夏嵩,毛小青,等.青藏高原黄土区护坡灌木植物根系力学特性研究[J].岩石力学与工程学报,2008,27(2):3445-3452.
[11] 李臻,余芹芹,杨占风,等.西宁盆地两种灌木植物原位拉拔试验及其护坡效应[J].水土保持研究,2011,18(3):206-209.
[12] Fung Y C. Biomechanics:Mechanical Properties of Living Tissues[M]. Germany:Springer-Verlag, 1993.
[13] 李有芳,刘静,张欣,等.4种植物生长旺盛期根系易受损的外力类型研究[J].水土保持学报,2016,30(6):339-344.
[14] Maeglin R R. National variation of tissue proportions and vessel and fiber length in mature northern red oak[J]. Silvae Genetica, 1976,25(3/4):122-126.
[15] 朱海丽,胡夏嵩,毛小青,等.护坡植物根系力学特性与其解剖结构关系[J].农业工程学报,2009,25(5):40-46.
[16] 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.
[17] 蒋坤云,陈丽华,杨苑君,等.华北油松、落叶松根系抗拉强度与其微观结构的相关性研究[J].水土保持学报,2014,27(2):8-12.
[18] 郭维俊,黄高宝,王芬娥,等.小麦根系力学性能及微观结构研究[J].农业机械学报,2010,41(1):92-95.
[19] 唐朝生,施斌,顾凯.纤维加筋土中筋/土界面相互作用的微观研究[J].工程地质学报,2011,19(4):610-615.
[20] 杨涛,周德培,雷承第,等.柔性防护边坡的稳定性分析[J].岩石力学与工程学报,2006,25(2):294-298.
[21] 周朔.林木根系拉伸力学特性研究[D].北京:北京林业大学,2011.
[22] 胡敏,李为萍,史海滨,等.布根方式及根系径级对根土复合体抗剪性能的影响[J].水土保持通报,2012,32(1):42-44.
[23] 吕春娟,陈丽华,周硕,等.不同乔木根系的抗拉力学特性[J].农业工程学报,2011,27(1):329-335.
[24] Bischetti G B, Chiaradia E A, Simonato T, et al. Root strength and root area ratio of forest species in Lombardy(Northern Italy)[J]. Plant and Soil, 2005,278(1):11-22.
[25] 陆桂红,欧国强,杨顺,等.泥石流源区典型草本植物根系抗拉试验[J].山地学报,2014,32(6):725-731.
[26] 张兴玲,胡夏嵩,毛小青,等.青藏高原东北部黄土区护坡灌木柠条锦鸡儿根系拉拔摩擦试验研究[J].岩石力学与工程学报,2011,30(S2):3739-3745.
[27] 中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.金属材料拉伸试验第1部分:室温试验方法GB/T288.1-2010[S].北京:中国标准出版社,2010.
[28] 陈世鐄.中国北方草地植物根系[M].长春:吉林大学出版社,2001.

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