| Purple soil is widely distributed in the Three Gorges reservoir area,and it is a highly productive erosion-type lithologic soil that is prone to water and soil loss.It poses a great threat to soil quality and poses a serious safety hazard to the Three Gorges Project.Therefore,combining the soil,hydrology and geological conditions unique to the Three Gorges reservoir area,starting from soil disintegration caused by water immersion in the reservoir,and the point of soil erosion caused by runoff from slopes,combined with the characteristics of the purple soil granules and roots,the plant roots are described.The study on enhancing the anti-water erosive effect of purple soil on the sloping land in the Three Gorges Reservoir area can provide theoretical guidance for the ecological restoration of bare land and soil and water conservation in the reservoir area.In this paper,bermudagrass was selected as the experimental plant.Through the different treatment methods of the root system,1)The total action of the root system:After planting,the plants above the soil layer were removed and the soil surface was cleaned.At this time,the root system was in the root In the state of roots,the total effect of roots on the soil,its two forces include: physical tandem effect,biochemical effect,soil extraction for erosion test,and disintegration test;2)treatment of dead root state: after planting,use herbicide-Glyphosate kills the plant one week later and finishes in the next three weeks.At this time,there is only physical consolidation in the purple soil.Then the flushing test and disintegration test are the same as 1).3)Remodeling treatment : After planting is completed,weeds are cleared from the purple soil without roots,and it is considered that the remodeling sample is a soil without a root system,and then the scouring test and the disintegration test are the same as 1).By measuring the root characteristics of the plant and measuring the characteristics of the purple soil under different modes of action of the root system,the effect of the root system on the structure of the purple soil was analyzed.The water resistance of the purple soil under different slopes,boundary conditions,and the action of the plant root system was studied by the hydrostatic disintegration test.Erosion performance;through indoor scour tests,the impact resistance of purple soil under different slope,runoff,and plant root conditions can be studied.You can analyze the relationship between the corrosion resistance,impact resistance,and root characteristics of purple soil;compare the root system.Under different conditions,qualitative analysis of the biochemical effects of purple soil containing roots,root soil binding and physical effects on the purple soil water erosion resistance contribution.Studies have shown that in the purple soil under the root action and dead root treatment mode,the corrosion resistance coefficient and impact coefficient of the purple soil are significantly increased compared to the soil remodeling treatment,and the order of the resistance coefficient and the impact coefficient is as follows: root total action sample>dead root treatment sample> remodeling treatment sample;as the slope increases,the corrosion resistance and resistance of the root total action sample,dead root treatment sample,remolded sample The redness shows a downward trend.In terms of resistance,studies have shown that in the case of the same root treatment,the purple soil has a larger resistivity than the borderless resist coefficient in the case of boundary restrictions;the soil resistivity increases with the root length and root density.The increase in density,root surface area density,total root projected area density,and total root tip number density all exhibited a tendency for the quadratic polynomial function to increase,and the coefficient of determination for the total root system effect under the same boundary conditions.Values>Deciding coefficient values for dead root treatment;Roots under total action conditions are the most significant for increasing soil erosion resistance,followed by dead root treatment.In the area of impact resistance,studies have shown that as the sediment concentration increases with time,it shows a decreasing trend of the power function;the soil’s impact coefficient increases with time and the runoff increases,all of which show a power function increase.Trend;Soil’s impact coefficient increases with the increase of root surface area density,root length density,and root weight density;quadratic function increases as soil slope coefficient increases.The samples treated with the root system had the most significant effect on improving the soil’s impact resistance and corrosion resistance,followed by the dead root treatment samples,and the worst on the remodeling samples... |
