The results showed that after skidding operation, the soil density increased, the soil moisture condition got bad, the soil porosity and the contents of soil nutrients decreased.
The results indicated that green coverings improved soil physical characteristics, soil bulk density decreasing by 5.68% and the soil porosity increasing by 6.15%.
结果表明:生草可改善土壤物理性状,使土壤容重平均降低5.68%,总孔隙度提高6.15%。
Methods Based on soil radon diffusive theory, a model including the influences of soil radium content, emanation coefficient, soil porosity and moisture saturation on radon exhalation was established.
The soil porosity and moisture content of Picea crassifolia community and Picea crassifolia community are increasing with the increase of converted years, and on the whole present a growth trend.
青海云杉群落、白桦群落土层孔隙度和持水量状况随退耕还林年限增加,大体呈增长趋势。
The volume quality of top soil is increased and the soil porosity is reduced owing to compaction, so water flow downward difficultly and the amount of water vertical infiltration is reduced.
由于压实,增加了表层土壤的体积质量,降低了土壤孔隙度,水不易向下运动。
The soil bulk reduced, the soil porosity and permeability improved.
地块的土壤容重减少,提高土壤膨松度,增强土壤透气性。
Soil radium contents, water contents, soil porosity and grain size were concretely analysed in our laboratory.