Impermeable clay limits downward percolation of water and fulvic acids, reducing chemical weathering and podzolization.
不可渗透的粘土限制了水和黄腐酸的向下渗透，从而减少了化学风化和土壤灰化作用。
2
The results show that under residual water conditions, gas percolation with low speed in water wet low permeability reservoirs has obvious characteristics of non Darcy flow.
研究成果表明：在残余水状态下，亲水低渗储层岩石中的气体低速渗流具有明显的非达西渗流特征；
3
Of all components of water balance in farmlands, evapotranspiration, capillary rise from a water table and deep percolation are difficult to determine.