Effect of different mulching materials on soil evaporation characteristics of disturbed interface in alpine mining area
[Objective]The purposes of this study are to investigate the permeability of different inorganic porous materials and the influence of ground mulch on soil evaporation,and to provide a certain basis for solving the problems of lower water infiltration and increase of evapotranspiration in permafrost areas caused by the exploitation of mineral resources in permafrost regions.[Methods]Eight kinds of inorganic porous materials were used as research objects to analyze the differences in their basic physical properties,such as microstructure and reflection characteristics.Three rainfall intensities were set to study the permeability of the materials under different thicknesses.Meanwhile,evaporation tests were carried out to investigate the effects of different mulching materials on the characteristics of soil moisture evaporation.[Results](1)The basic physical properties of the eight materials,such as dry bulk,wet bulk weight,pore properties and reflectance,varied significantly(p＜0.01),among which glass pumice Ji,glass pumice J2 and ceramic aggregate had moderate aeration and water holding capacity.(2)In terms of water permeability,volcanic stone,maifanite,ceramic aggregate,glass pumice J1 and glass pumice J2 had better performance.Moreover,permeability of the material was significantly inversely proportional to thickness and proportional to the rainfall intensity(p＜0.01).(3)In terms of evaporation inhibition performance,glass pumice J1,glass pumice J2,ceramic aggregate,volcanic stone and expanded pearlite reduced the cumulative evaporation of soil significantly(p＜0.05).[Conclusion]The physical properties(microstructure,reflectivity,etc.)of different materials are significantly different.The three mulching materials of glass pumice J1,glass pumice J2 and ceramic aggregate can better inhibit the occurrence of soil evaporation than other materials,which can provide a material basis for the near-natural reconstruction of permafrost in alpine mining area.
万方数据
维普
