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通过采用自制的剪切箱和锚杆拉力计对玉米(云瑞8号,Zea mays.L)根系在10 cm和20 cm两个深度上和空地样方的固土能力进行了原位测定比较。结果表明,施加相同载荷时,两种深度空地样方位移大于有根玉米样方;20 cm深度样方位移为4个样方中最小。作物扎根越深,达到剪切分离样方特征点所需的载荷越大。10cm玉米样方屈服拉力点载荷为2.7 kN,抗拉极限点载荷为2.9 kN;20 cm玉米样方屈服拉力点载荷为3.6 kN,抗拉极限点载荷为3.61 kN;10 cm空地样方两点载荷分别为2.3 kN和2.5 kN;20 cm深度空地样方载荷分别为3.1 kN和3.4 kN。该方法可直接量化测定玉米根系固土能力,为农业水土保持提供了有效研究手段。
In situ determination of corn-fixing (Yuna 8, Zea mays L.) root-fixing ability at two depths of 10 cm and 20 cm and open-air quadrats was carried out by using a homemade shear box and anchor tension meter . The results show that when the same load is applied, the displacements of the two kinds of deep space are larger than that of the root corn. The displacement of the 20 cm depth is the smallest among the four samples. The deeper the crop is rooted, the greater the load required to reach the point of shearing and separating the quadrats. The yield stress at 10 cm maize quadrat was 2.7 kN and the ultimate tensile load was 2.9 kN. The loading stress at 20 cm maize quadrat was 3.6 kN and the ultimate tensile loading was 3.61 kN. The loads were 2.3 kN and 2.5 kN, respectively. The loadings of 20 cm deep open space were 3.1 kN and 3.4 kN, respectively. The method can directly quantify the ability of corn root system to fix soil and provide an effective research method for agricultural soil and water conservation.