覆草后土壤的物理性状也得到改善，土壤容重降低、田间持水量和孔隙度提高。
The physical character of soil was also improved after covering straw. The soil bulk density was reduced. Field moisture capacity and porosity percentage were increased.
两个试验田改良后土壤性质定量研究表明：（1）土壤容重降低，土壤总孔隙度增加；
The studies of the soil properties suggested : (1) the bulk densities of the soils decreased and the general porosity of soil increased after amelioration;
通过分析得出，施行保护性耕作后不会引起土壤板结等问题，而且能够不同程度的降低土壤容重，改善土壤的结构特性。
Through analyzing, conservation tillage did not cause the soil to harden etc, and can reduce the soil bulk density in various degree, improved the structure characteristic of the soil.
四种改良剂均能不同程度的改善土壤物理性状，能降低土壤容重，提高土壤总孔隙度，加快渗透速度，增加田间持水量。
Four kinds of amendments can improve soil physical properties. Soil bulk density decreased, soil porosity, permeability coefficient and field capacity increased under treatments.
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%。
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%.
秸秆还田还降低了土壤容重。
Maize straw returning to the field also decreased soil bulk density.
随着土壤深度增加，不同覆盖处理之间土壤水分含量差异增大。4种材料覆盖均有利于降低土壤容重，其中以秸秆效果最显著。
However, the difference of soil moisture increase with the soil depth among 4 mulching materials. All mulching can decrease soil unit weight. And straw mulching has the most effects.
结果表明：森林采伐后土壤容重增大，孔隙度减小，土壤持水性能降低。
The results showed that forest harvesting resulted in increase in soil volume weight, lessening porosity, and decline in function of water holding.
结果表明：森林采伐后土壤容重增大，孔隙度减小，土壤持水性能降低。
The results showed that forest harvesting resulted in increase in soil volume weight, lessening porosity, and decline in function of water holding.
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