Mechanisms of shear tension resistance of root-soil complexes by inoculated bacteria and potential for ecological restoration in mines

Coal mining has formed open-pit dumps and underground subsidence areas, changing the original landform and ecology. The instability of the open-pit dump slope is easy to cause soil erosion, which causes the landslide to shear the vegetation root system. The underground subsidence causes the ground fissure to develop and damage the plant root system. Therefore, one of the keys to mine ecological restoration is to enhance the shear resistance and strain resistance of plant roots. Microbial reclamation has the functions of improving soil physical and chemical properties, promoting plant root development and stress resistance. The effect of inoculation on the shear and tensile resistance of root-soil complex is have laid a good foundation for revealing the mechanism of mine ecological restoration. After artificial restoration, plant roots and soil to form a root-soil complex, which can greatly increase the shear strength of the soil, enhance the stability of the shallow soil, effectively reduce the soil and water loss of the slope of the open-pit dump and relieve the root starin. Arbuscular mycorrhizal fungi (AMF) or dark septate endophytic fungi (DSE) are ubiquitous in the rhizosphere, and their mycorrhizal symbionts formed with roots are bonded to the rhizosphere soil to form a root-soil complex. There are few studies on the mechanism and influencing factors of shear resistance. Therefore, the influencing factors, mechanism of action and ecological restoration potential of root-soil complex inoculated with microorganisms in mining areas are reviewed in this artical. At the same time, combined with the analysis of experimental data, it is concluded that the underground biomass, soil cohesion and shear strength of root-soil composite soil inoculated with AMF and DSE are significantly improved. Microbial reclamation technology not only improves the survival rate and stress resistance of artificial restoration vegetation.