文章摘要
崔天民, 格日乐, 杨锐婷, 王争贤.内蒙古中西部3种典型乡土植物根系抗折力学特性[J].水土保持学报,2021,35(2):138~143,151
内蒙古中西部3种典型乡土植物根系抗折力学特性
Root Anti-fracture and Mechanical Properties of Three Typical Native Plants in Central and Western Inner Mongolia
投稿时间:2020-09-19  
DOI:10.13870/j.cnki.stbcxb.2021.02.019
中文关键词: 折损  愈伤  抗折力  抗折强度
英文关键词: damage  wound curing  anti-fracture forces  anti-fracture strength
基金项目:国家自然科学基金项目“梯度应力下植物根系在固土抗蚀受损后自修复的生物力学响应机制”(41867011);内蒙古自然科学基金项目“沙结皮防风抗蚀的力学特性研究”(2017MS0407)
作者单位E-mail
崔天民, 格日乐, 杨锐婷, 王争贤 内蒙古农业大学沙漠治理学院, 呼和浩特 010018 gerile197081@126.com 
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中文摘要:
      为固土抗蚀优良树种的选择提供生物力学方面的参考依据,也为揭示植物根系持续固土抗蚀力学特性。以内蒙古中西部风水复合侵蚀区的3年生人工柠条(Caragana korshinskii)、沙棘(Hippophae rhamnoides)、紫花苜蓿(Medicago sativa)3种典型乡土植物根系为对象,相同立地条件下使用HG100数显式推拉力计和自制便携式实验平台,在测试直径0.5~4 mm范围内,对单根进行70%极限折力受损,待自修复3个月后,研究3种植物根系抗折力及抗折强度的变化、比较不同植物种之间的差异性。结果表明,3种植物愈伤后单根平均抗折强度大小为:柠条(15.504 MPa)>沙棘(12.342 MPa)>紫花苜蓿(6.584 MPa),说明柠条根系受折受损愈伤自修复后的抗折能力优于沙棘和紫花苜蓿,沙棘又优于紫花苜蓿。3植物根系总体呈现平行对照组单根抗折力(强度)>愈伤后单根抗折力(强度),只有紫花苜蓿平行对照组单根抗折强度与其愈伤后的值无显著差异。柠条平均抗折力下降64%,沙棘平均抗折力下降28%,紫花苜蓿平均抗折力下降27%;柠条平均抗折强度下降40%,沙棘平均抗折强度下降22%,紫花苜蓿平均抗折强度下降12%,说明植物种不同则生物学特性不同,受损愈伤后恢复抗侵蚀能力不同。
英文摘要:
      In order to provide a biomechanical reference for the selection of excellent tree species for soil fixation and erosion resistance,and to reveal the mechanical characteristics of plant roots for continuous soil fixation and erosion resistance,three typical native plant roots of 3-year-old Caragana korshinskii, Hippophae rhamnoides and Medicago sativa in the complex erosion area of wind and water in the central and Western Inner Mongolia were taken as the research objects. Under the same site conditions,using the self-made portable root radial and axial mechanical properties test bench and HG100 digital display push-pull meter, 70% ultimate bending force of single root was damaged in the test diameter range of 0.5~4 mm. After 3 months of self-healing, the changes of anti-fracture forces and anti-fracture strength of three kinds of plant roots after damaged callus were studied, and the differences among different plant species were compared. The results showed that the average comparison of anti-fracture strength of three kinds of plants after restoration were Caragana korshinskii (15.504 Mpa)>Hippophae rhamnodes (12.342 Mpa)>Medicago sativa (6.584 Mpa), indicating that the bending resistance of Caragana korshinskii was better than that of Hippophae rhamnodes and Medicago sativa, and Hippophae rhamnodes was better than Medicago sativa. However, in numerical value, there was no significant difference in single root anti-fracture strength between Medicago sativa parallel control group and after callus. For the average anti-fracture forces, Caragana korshinskii, Hippophae rhamnodes and Medicago sativa decreased by 64%, 28% and 27% respectively. For the average anti-fracture strength, Caragana korshinskii, Hippophae rhamnodes and Medicago sativa decreased by 40%, 22% and 12% respectively. These results showed that the biological characteristics of different plant species were different, and the recovery ability of erosion resistance was different after damaged callus.
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