Study On Pore Structures And Soil Water Infiltration Characteristics Of The Newly Formed Soil In Jin-Shan-Meng Energy District

Soil reconstruction refers to rebuilding a new stable soil profile structure,which have a relatively good soil fertility conditions,by adopting some appropriate physiochemical and engineering techniques to restore ecological landscapes and increase plant productivity.The reconstructed soils are widely distributed in the surface coal mining area,including the reclaimed mine soil on the dumping area and the sandy soil amended by some porous materials.The study of soil water movement and soil physiochemical properties,which have important guiding and theoretical significant,make great contribution to the agricultural development and ecological restoration,especially for the arid and semiarid area.In the present study,the physically amended sandy soils and reclaimed mine soil were explored.We explored the effects of adding porous materials on the water holding capacity of the sandy soil and the characteristics of soil water infiltration on the dumping area with different restoration plants.The results shows that:(1)The physically amended sandy soils shows great improvement on the soil mechanical particle composition and water holding capacity.The sandy soil amended by MS(Montmorillonite-Sandstone)decrease the SI(Soil Stability Index).The fly ash could increase the SI in sandy soil,especially when the amended proportion of 10%.(2)Multifractal parameters are effective tools for the description and quantification of soil structure's spatial variabilities.The right branches of multifractal spectrums show great response to the addition of porosity materials,which indicate that the porous materials has significant effect on the smallest pores in the sandy soil.The width of generalized dimension and multifractal spectrum could represent the scaling diversity of soil pore structure in two dimensional space.The multifractal analysis showed that the scaling diversity decreased whith the increase of adding proportion of the two porous materials.(3)The variation coefficient of the soils in dumping areas than that in original grass land because of the long period of stacking and accumulation by heavy machines.The processes of reclamation and land use types had great impact on the soil water infiltration.The agricultural reclaimed mine soil had greater soil bulk density compared with bare land due to the uses of heavy machines,which result to smaller soil water infiltration capacity.(4)The volume density,area density and width distribution could describe the morphological properties of preferential flow path.The spatial complexity of soil preferential flow shows greater variation in the reclaimed dumping soils than that in original grass land soil because of the strong spatial heterogeneity.Additionally,preferential flow paths formed when soil water went through the plant roots and worm caves.The cultivation of shrubs such as caragana could increases the numbers of preferential flow path in the reclamation dumping areas.