發(fā)布時間：2018-09-03 12:21

【摘要】：本文以小葉錦雞兒(Caragana microphylla)、沙柳(Salix psammophila)、中國沙棘(Hippophae rhamnoides)直根和側根分支處為研究對象,于5月對正常生長不離體的直根和側根分支處分別施加3種程度的損傷折力(為該徑級平均極限折力的30%、50%和70%),并將受力后的根系埋回,待根系愈傷3個月(5～8月份)和5個月(5～10月份)后挖出,研究根系受損愈傷后成活率、活性值和根徑的變化,以及極限抗折力和抗折強度。研究結果如下:(1)1～4mm根徑范圍內(nèi)的3種植物直根和側根分支處,分別承受3種損傷力,分別經(jīng)過3個月和5個月愈傷后的平均存活率均大于60%;愈傷后的根系活性值小于平行對照;3種植物愈傷后的根系直徑均較施加損傷力時有所增加。(2)對于直根和側根分支處,承受3種程度的損傷力愈傷后,其極限抗折力與直徑均呈冪函數(shù)正相關,抗折強度與直徑均呈冪函數(shù)負相關關系。根系愈傷后的極限抗折力、抗折強度與對照相比,均呈減小趨勢,損傷力越大,減小幅度越大。(3)對于承受相同程度損傷力的直根和側根分支處,愈傷3個月后小葉錦雞兒、中國沙棘根系的抗折力、抗折強度均表現(xiàn)為直根大于側根分支處,小葉錦雞兒側根分支處分別承受30%,50%,70%的極限折力愈傷3個月后,其抗折強度分別為相同條件下直根的67%,65%和65%;中國沙棘側根分支處愈傷后的抗折強度分別為直根的59%、57%和53%。沙柳愈傷后直根與側根分支處抗折力、抗折強度隨差異不明顯。(4)3種植物相同徑級的直根承受相同程度損傷力,愈傷3個月后的極限抗折力、抗折強度均小于愈傷5個月。(5)3種植物同部位、同徑級根系承受3種程度折力愈傷后的抗折力和抗折強度種間差異與正常生長根系的規(guī)律一致,均為小葉錦雞兒沙柳中國沙棘。
[Abstract]:The direct root and lateral root branches of (Caragana microphylla), Salix (Salix psammophila), of Hippophae rhamnoides chinensis were studied in this paper. In May, three degrees of damage force (30% and 70% of the average ultimate flexural force) were applied to the straight root and lateral root branch of the normal growth, respectively, and the root system was buried back after the stress. The survival rate, activity value, root diameter, ultimate flexural resistance and flexural strength of root callus were studied after root callus were harvested for 3 months (May / August) and 5 months (May / October). The results are as follows: (1) the direct roots and lateral root branches of three species of plants in the 1~4mm root diameter range are subjected to three kinds of damage forces, respectively. After 3 and 5 months, the average survival rate of callus was higher than 60 and the root activity value of callus was smaller than that of parallel control. (2) the root diameter after callus was higher than that at the same time. (2) for the branches of straight root and lateral root, the diameter of roots after callus was higher than that after callus injury. The ultimate flexural strength was positively correlated with the diameter and the strength was negatively correlated with the diameter. Compared with the control, the ultimate flexural strength of root callus decreased, and the greater the damage force, the greater the extent of reduction. (3) for the straight root and lateral root branch which suffered the same degree of damage, 3 months after callus, Caragana microphylla, The flexural strength of the roots of Hippophae rhamnoides was greater than that of the lateral roots, and the lateral root branches of Caragana microphylla were subjected to 30% or 70% of the ultimate flexural strength after 3 months of healing. The flexural strength of the lateral root branch of Hippophae rhamnoides was 59.57% and 53.53% of that of the straight root, respectively, and that of the lateral root branch of Hippophae rhamnoides chinensis was 59.57% and 53.53% of that of the straight root, respectively. There was no significant difference in the flexural strength between the straight root and the lateral root branch after callus injury. (4) the direct roots of the three species of plants with the same diameter class suffered the same degree of damage, and the ultimate flexural strength after 3 months of callus injury. (5) in the same part of the three plants, the difference of resistance and strength between species and normal growth root system was consistent with that of normal growth root system, all of them were Hippophae rhamnoides chinensis.
【學位授予單位】：內(nèi)蒙古農(nóng)業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：Q948

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