Study on the Vulnerable Root Location of Two Kinds of Plants by Anti-Fracture Force

摘要

To clarify the soil reinforcement mechanisms by plant roots, the vulnerable location of the root system by anti-fracture force was investigated. In the experiment, the antifracture force of lateral root branch and adjacent upper straight root of 3-4 year-old Caragana korshinskii and Hippophae rhamnides were measured with the self-made fixture and TY 8000 in vigorous growing seasons. The results indicated that the anti-fracture force and root diameter were positively correlated with a power function, and the anti-fracture strength and root diameter were negatively correlated with a power function for the two plants at the root diameter between 1 to 4 mm. The anti-fracture force and anti-fracture strength of lateral root branch were less than that of adjacent upper straight root for the two plants. The anti-fracture strength of lateral-root branch and adjacent straight root followed the sequence of C. Korshinskii (33.66 and 47.06 MPa)> H. Rhamnides (3.97 and 8.75 MPa). The lateral root branch in relative with the adjacent straight root can easily be destroyed.