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以3~4年生柠条、沙柳、沙棘、白沙蒿为研究对象,采用TY8000系列伺服控制材料试验机,研究加载速度及土壤含水率对直根抗折强度的影响。结果表明:4种植物直根的抗折强度与加载速度呈正相关,1.5~2.0mm及3.0~3.5mm 2个径级的直根在承受瞬时折断力(加载速度500mm/min和860mm/min)时的抗折强度显著高于相同径级的根在缓慢折断力(加载速度10mm/min)时的抗折强度,其中加载速度500mm/min时2个径级直根抗折强度为柠条((58.30±7.45)MPa,(49.21±3.45)MPa)>沙柳((23.21±1.88)MPa,(19.12±2.95)MPa)>沙棘((7.79±1.06)MPa,(6.61±1.05)MPa)>白沙蒿((5.51±0.66)MPa,(4.43±0.38)MPa),相同径级的根在缓慢折断力时的抗折强度分别为上述强度的87.1%、83.7%,82.8%、86.8%,79.2%、81.8%,90.0%、73.6%。4种植物直根抗折强度随着土壤和根系含水率的增加呈减小趋势,2.0~2.5mm的直根在土壤干旱(含水率为0.0%)时的抗折强度为柠条((60.05±7.00)MPa)>沙柳((25.99±2.88)MPa)>沙棘((8.52±1.17)MPa)>白沙蒿((5.85±0.63)MPa),在土壤含水率饱和(含水率为25.6%)时的抗折强度分别为上述强度79.1%、73.0%、74.3%、65.1%。
Taking the 3- to 4-year-old Caragana korshinskii, Salix psammophila, Seabuckthorn and Artemisia sphaerocephala as the research object, the TY8000 series servo controlled material testing machine was used to study the effect of loading speed and soil water content on the root flexural strength. The results showed that the bending strength of straight roots of four plants was positively correlated with the loading speed. The straight roots with diameters of 1.5 ~ 2.0mm and 3.0 ~ 3.5mm were subjected to instantaneous breaking force (loading speed of 500mm / min and 860mm / min) , The flexural strength was significantly higher than that of the same diameter root at the slow breaking force (loading speed of 10 mm / min), and the root bending strength of the two diameters at the loading speed of 500 mm / min was Caragana korshinskii (49.21 ± 3.45) MPa and (49.21 ± 3.45) MPa, respectively. Compared with the control group, the contents of seabuckthorn (7.79 ± 1.06) MPa and (6.61 ± 1.05) MPa> (5.51 ± 0.66) MPa, (4.43 ± 0.38) MPa). The flexural strength of the roots with the same diameter under the condition of the slow breaking force were 87.1%, 83.7%, 82.8%, 86.8% and 79.2 %, 81.8%, 90.0%, 73.6%. The flexural strength of straight root of four species decreased with the increase of soil and root moisture content. The flexural strength of 2.0-2.5 mm straight root when soil drought (water content 0.0%) was Caragana korshinskii ((60.05 (5.85 ± 0.63) MPa) of Salix psammophila (25.25 ± 2.88 MPa)> Seabuckthorn (8.52 ± 1.17 MPa)> Artemisia annua (5.85 ± 0.63) MPa). When the soil water content was saturated When the flexural strength of the above-mentioned intensity of 79.1%, 73.0%, 74.3%, 65.1%.