4种植物根系受剪受损愈伤后的抗剪特性研究

发布时间：2018-01-07 13:33

本文关键词：4种植物根系受剪受损愈伤后的抗剪特性研究　出处：《内蒙古农业大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文以沙柳(Saalix psammophila)、柠条(Caragana microphylla)、沙棘(Hipp-ophae rhamnoides)、白沙蒿(Artemisia sphaerocephala)为研究对象,通过原位剪切试验测定1年生4种植物整株根-土复合体抗剪强度,在此基础上对4种植物施加不同程度的损伤剪力,待根系愈伤3个月和5个月后,研究其受剪受损愈伤后的抗剪特性,结果如下:(1)相同侧限条件下,1年生的4种植物累计根长、根表面积、根体积和根干重种间差异为沙柳柠条白沙蒿沙棘;4种植物剪切面处根-土横截面积比率与抗剪强度呈正比,根-土复合体抗剪强度大小为:沙柳(16.57±2.73)kPa条(9.83士2.52)kPa沙棘(7.59±1.17)kPa白沙蒿(7.34±1.48)kPa素土(5.39±0.79)kPa;残余强度为沙柳(9.69±2.34)kPa柠条(6.41±1.80)kPa沙棘(3.70±1.15)kPa白沙蒿(3.17±0.87)kPa素土(2.51±0.42)kPa,根系显著增强了土体的抗剪强度和残余强度,有效的提高了土体的稳定性。(2)4种植物根系受剪愈伤的存活率:承受相当于平均极限剪力25%、50%和75%的损伤力愈伤3个月后存活率均大于83.3%,愈伤5个月后存活率均大于90.9%,且根系受损伤力越小,存活率越高。(3)4种植物根系受不同程度损伤剪力愈伤3个月后,根-土复合体抗剪强度和残余强度均大于素土,但小于平行对照。当根-土复合体承受25%的平均极限剪力时,4种植物愈伤至8月后的抗剪强度和残余强度较平行对照的减小率较低,而根-土复合体承受75%的平均极限剪力愈伤至8月后,抗剪强度和残余强度均与平行对照间存在显著性差异。4种植物根系愈伤后抗剪强度和残余强度与平行对照的比值种间差异为:沙柳柠条沙棘白沙蒿。(4)愈伤时间越长,柠条、沙棘和白沙蒿根-土复合体愈伤后的抗剪强度和残余强度越接近平行对照,沙柳根系受愈伤时长的影响微弱。
[Abstract]:In this paper, Saalix psammophila and Caragana microphylla were studied. Hipp-ophae rhamnoidesus and Artemisia sphaerocephala were studied. In situ shear test was used to determine the shear strength of the whole root-soil complex of four annual plants. On the basis of this, the four plants were subjected to different degree of damage shear force, and the root callus was 3 months and 5 months later. The characteristics of shear resistance of the callus damaged by shear were studied. The results were as follows: 1) under the same lateral limit, the accumulative root length and root surface area of 4 species of 1 year old plants were obtained. The difference between root volume and root dry weight was Hippophae rhamnoides in Caragana korshinskii. The ratio of root to soil cross-sectional area at the shear surface of four plants is in direct proportion to the shear strength. The shear strength of root-soil complex is 16.57 卤2.73 KPA, 9.83 + 2.52 KPA, 7.59 卤1.17 KPA. 7.34 卤1.48 KPA 5.39 卤0.79 KPA; The residual strength was 9.69 卤2.34kPa Caragana kPa 6.41 卤1.80kPa seabuckthorn 3.70 卤1.15kPa Artemisia annua 3.17 卤0.87; KPa was 2.51 卤0.42kPa. The root system significantly enhanced the shear strength and residual strength of the soil, and effectively increased the stability of soil. The survival rate of the four plant roots was increased: the mean ultimate shear force was 25%. The survival rate of 50% and 75% was higher than 83.3 after callus, and the survival rate after 5 months of callus was more than 90.90.The damage ability of root system was less than that of 50% and 75%. The higher the survival rate, the higher the shear strength and residual strength of root-soil complex were higher than that of plain soil. When the root-soil complex withstands an average ultimate shear force of 25%, the shear strength and residual strength of the four plant calli after August are lower than those of the parallel control. The root-soil complex suffered an average ultimate shear strength of 75% after August. There was significant difference between shearing strength and residual strength. 4. The ratio of shear strength and residual strength to parallel control was: Caragana korshinskii, Hippophae rhamnoides, Artemisia rhamnoides, et al. The longer the callus is. The shear strength and residual strength of the callus of Caragana korshinskii, Hippophae rhamnoides and Artemisia artemisia after callus were similar to those of the parallel control, and the root system of Salix willow was slightly affected by the callus duration.
【学位授予单位】：内蒙古农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：Q948

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