The studies of the soil properties suggested : (1) the bulk densities of the soils decreased and the general porosityofsoil increased after amelioration;
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；
2
This article mainly studied the variation of aeration porosity in soil under shed protection in Harbin, Heilongjiang Province.
本文主要对黑龙江省哈尔滨市一定点大棚内土壤剖面通气孔隙的变化进行了研究。
3
The effects of high intensity fires on soil unit weight, porosity and separate coefficient were significant.