Preferential Flow Experiment and Numerical Simulation on Microbial Mineralized Vegetation Soil in Slope Lattice
To explore the feasibility of water storage-based vegetation restoration at the filling surface layer in microbial mineralized rocky desertification slope lattices,5 types of composite soil column samples were created,i.e.,pure soil,weakly mineralized surface soil,strongly mineralized surface soil,pure soil with plants,and strongly mineralized surface soil with plants.These samples underwent rainfall-drying tests and numerical simulations.By measuring the infiltration and outflow of preferential rainfall during the rainfall stage,the development of surface soil cracks in drying stage,and the hydraulic characteristics inside the soil columns during both stages,the study investigated the preferential flow patterns for water storage-based vegetation restoration at the filling surface layer in microbial mineralization lattices.Simultaneously,the numerical simulations of prototype rainfall-drying processes were conducted on the soil column samples,comparing the calculated and measured values of moisture content and suction at various depths.The result indicates that during the rainfall stage,the accumulated rainwater first fills the vegetation soil with water storage holes,where the wetting saturation zone is primarily distributed.That plays the role of water reservoir funnel.For the soil columns of surface mineralization with plants,within the slope lattice,the average moisture content of soil at depth of 12-32 cm can reach up to 24%.During the drying stage,the surface mineralized soil reduces crack formation by about 95%compared with the pure soil.At 2 cm depth under the surface,the measured water contents from high to low are strongly mineralized surface(25%),surface mineralization with plant(22%),pure soil(20.2%),and plant(18%).The surface hard crust layer effectively inhibits cracking and locks in moisture,reducing the evaporation loss of stored rainfall,and enhancing the soil water retention.Meanwhile,the filling surface layer in microbial mineralized rocky desertification slope lattices exhibits the excellent water storage capacity,facilitating the vegetation restoration on rocky desertification slopes.
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