论文部分内容阅读
应用锚杆拉力计和自行设计的剪切箱对不同根系密度的油菜根系固土能力在10 cm深度进行了原位测定。结果表明,当施加载荷达到3.5 kN时,生长有油菜的土壤样方1(根系密度为1.11 kg/m3)位移为38.0mm,生长有油菜的土壤样方2(根系密度为0.57 kg/m3)位移为46.0 mm,而裸土样方位移为49.7 mm。土壤样方内根系密度越大,达到土壤样方与土体分离的特征点所需要施加的载荷就越大。土壤样方1的屈服拉力点为3.5 kN,抗拉极限点为4.0 kN;而土壤样方2的屈服拉力点为3.1 kN,抗拉极限点为3.5 kN。该测定方法可以在水土保持上作为评价不同作物(植物)固土能力的有效参考手段。
The anchorage ability of root systems with different root densities was measured in situ at a depth of 10 cm by using a bolt tension meter and a self-designed shear box. The results showed that when the applied load reached 3.5 kN, the displacement of soil sample 1 (root density 1.11 kg / m 3) with rape growth was 38.0 mm and that of rapeseed 2 (root density 0.57 kg / m 3) The displacement is 46.0 mm, while that of bare soil is 49.7 mm. The greater the density of root system in the soil sample, the greater the load applied to reach the point of separation of the soil sample from the soil. The yield point of soil sample 1 was 3.5 kN and the ultimate tensile point was 4.0 kN. The yield point of soil sample 2 was 3.1 kN and the ultimate tensile point was 3.5 kN. The determination method can be used as an effective reference for evaluating soil-fixing ability of different crops (plants) on soil and water conservation.