The Influence Factors of Plant Root-soil Interface Friction

In order to explore the factors influencing roots-soil interface friction, tests of pullout of single root in soil were carried out. The results show that roots-soil interface friction increased linearly with the increasing diameter and burial depths. The mean friction firstly increased and then decreased with the increasing soil moisture content. The friction force decreased with the increasing loading rate. The difference of root-soil interface friction and friction coefficient were significant between the species. For the mean friction force, Betula platyphylla and Larix gmelinii were the highest, followed by Quercus mongolica and Pinus tabulaeformis was the lowest. For the mean friction coefficient, Larix gmeliniiand and Quercus mongolica were the highest, followed by Betula platyphylla and Pinus tabulaeformis was the lowest.