中文摘要：

以3～4年生柠条和沙棘根为研究对象,采用悬臂梁试验对同径级的直段根和侧根分支处进行弯曲试验。结果表明：2种植物同径级直段根和侧根分支处抗弯力与直径均呈幂函数正相关关系,而抗弯强度随直径变化无明显规律,在均值左右波动;多数径级范围,同种植物间平均抗弯力和平均抗弯强度均表现为直根段大于侧根分支处;相同径级时,当直根段和侧根分支处直径〉2.5mm时,2种植物直段根和侧根分支处抗弯力和抗弯强度的种间比较均表现为柠条〉沙棘;柠条直段根抗弯强度约为沙棘直段根抗弯强度的1.12倍,柠条侧根分支处抗弯强度约为沙棘侧根分支处抗弯强度的1.04倍。

英文摘要：

With the 3—4year-old Caragana intermedia,Hippophae rhamnoides as the research objects,the same diameter straight root and lateral root＇s bending mechanical characteristics through the cantilever beam test were studied.The results showed that,bending force of two plants＇ straight root and lateral root showed a positive power function relation to diameter.The bending strength had no law to diameter,fluctuating around the average.The same plant of average bending force and bending strength showed that straight root was greater than the same diameter lateral root during most diameter level range.At the same diameter,when straight root and lateral root＇s diameter〉2.5mm,the bending force and bending strength of the two plants comparead：Caragana intermedia〉Hippophae rhamnoide.The bending strength about Caragana intermedia straight root was about 1.12 times of Hippophae rhamnoides straight root.The bending strength about Caragana intermedialateral root was about 1.04 times of Hippophae rhamnoides lateral root.