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半干旱地区3种植物根系的抗弯力特征
格日乐1, 刘艳琦1, 孙保平2, 阿如旱1, 娜日苏3
1.内蒙古农业大学 沙漠治理学院, 内蒙古 呼和浩特 010019;2.北京林业大学 水土保持学院, 北京 100083;3.内蒙古农业大学 草原与资源环境学院, 内蒙古 呼和浩特 010019
摘要:
[目的]研究内蒙古中西部3种典型水土保持植物柠条(Caragana korshinskii)、沙棘(Hippophae rhamnoides)、紫花苜蓿(Medicago sativa)的根节点与相邻直根在不同直径下抗弯力和抗弯强度,为植物根系网络固土内在机理的研究提供科学依据。[方法]通过悬臂梁弯曲试验的方法,对3种植物的根节点与相邻直根进行抗弯试验。[结果]在测试根径1~5 mm范围内,3种植物根节点和相邻直根的抗弯力与直径均呈幂函数正相关,3种植物根节点和相邻上级直根平均抗弯力的种间大小顺序一致,为柠条>紫花苜蓿>沙棘。在测试根径2~5 mm范围内3种植物根节点的平均抗弯强度均小于各自相邻上级直根的平均抗弯强度,且种间大小顺序为柠条(21.87,24.33 MPa) > 紫花苜蓿(10.69,17.02 MPa) > 沙棘(4.81,4.95 MPa)。[结论]3种植物中柠条根系抵抗弯曲变形的能力最大。沙棘根节点与其相邻直根抗弯强度差值最小,其各级根系间共同作用抵抗变形的能力最好,有利于根系网中各级根系间的固结,更加有助于根系网发挥其固持土体的作用。
关键词:  相邻上级直根  根节点  抗弯力  抗弯强度
DOI:10.13961/j.cnki.stbctb.2018.03.018
分类号:
基金项目:国家自然科学基金项目“准格尔露天煤矿排土场水土保持功能植被固土抗蚀生物力学响应机制”(41161046);内蒙古自然科学基金资助项目“沙结皮防风抗蚀的力学特性”(2017MS0407)
Characteristics of Root Bending Resistance of Three Plants in Semi-arid Area
GE Rile1, LIU Yanqi1, SUN Baoping2, ARU Han1, NA Risu3
1.College of Desert Control Science and Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010019, China;2.College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China;3.College of Grassland Resources and Environment, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010019, China
Abstract:
[Objective] To study the adjacent tap root and root nodes of typical soil and water conservation plants Caragana korshinskii, Hippophae rhamnoides and Medicago sativa in the different diameters of bending resistance and bending strength in Midwestern Inner Mongolia, in order to provide a scientific basis for the study of the inner mechanism of the plant root network.[Methods] Using bending test of cantilever beam, the tap root and root nodes of three kinds of plants was investigated.[Results] In the test root diameter range of 1~5 mm, the bending resistance of three plant root nodes and adjacent tap roots were positively correlated with the diameters, and the of three plant root nodes and adjacent superior tap root was ranked as:C. korshinskii > M. sativa > H. rhamnoides. In the test root diameter range of 2~5 mm, the root node bending force of three plants was smaller than their adjacent superior tap root, and ranked as:C. korshinskii (21.87, 24.33 MPa) > M. sativa (10.69, 17.02 MPa) > H. rhamnoides (4.81, 4.95 MPa).[Conclusion] The capacity of the C. korshinskii root system to resist bending deformation is the best among three plants. The least bending strength differences have been found between H. rhamnoides root nodes and adjacent tap roots, indicating that the bending resistance of H. rhamnoides root system is the best at all levels, which is beneficial to the consolidation of root systems.
Key words:  adjacent superior tap root  root node  bending force  bending strength