与常规水作相比，覆膜旱作稻田土壤容重有所下降，总孔隙度增加显著；
The results were as follows:Compared with conventional flooded paddy soils, rain fed and mulching plastic film slightly reduced bulk density, increased total porosity of the soils.
并分别得出土壤容重、比重、毛管孔隙度和饱和导水率与粉煤灰用量的模拟方程。
The simulation equation between these ecological factors and the amount of coal fly ash was gained.
随耕种年限的增加，耕地在养分、质地以及容重退化的同时保水保肥能力降低。
With the increase of farming years the degradation of nutrients, texture and bulk density weakened the soil abilities of water and fertility retention.
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