母质层 meaning in English

c horizon
lithic contact
parent material horizon
parent rock horizon

It also concluded that garden area soils showed the strongest stability among all soils . 2
不同利用方式的土壤中，园地土壤有最强的稳定性，荒地?母质层和林地土壤稳定性最低。
It was found that forest soils were stronger in aggregate stability compared with parent material or bare soils
在各种土地利用方式中，林地土壤的稳定性最高，母质层和荒地土壤稳定性最小，而园地的稳定性大于耕地。
In addition , the big aggregate of parent material layer and bare soils had the biggest slaking index ( rsi ) and the cultivated soils ranked the next place
利用方式中，母质层和荒地土壤的大团聚体消散系数（ rsi ）最大，其次是耕地。而小团聚体中，耕地的rsi最小。