母质层

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。3不同测定方法获得的稳定性指标，土壤稳定性排序不同。

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 . 3 .

灰钙土的剖面可分为腐殖质层，钙积层及母质层三个发生层段。

Sierozem sections can be divided into humus , calcium , and the parent material laminated layers .

人工造林可加速土壤层的形成进程，提高土壤的入渗率，如香樟-羊蹄甲基混交林，土壤层稳渗率为4.72mm.min-1，而母质层仅为0.16mm。

Vegetation restoration could speed up the process of soil formation and raise the infiltration rate of soil .

因此，土壤有机碳的分布按表层，淋溶层，淀积层，母质层，逐层减少。

Therefore , the distribution of soil organic carbon by surface leaching layer , layer deposition , parent material , layer by layer reduction . 3 .

而下方过渡层和母质层的性质与之相反，它们所含的胶结物质较少，土体结构松散，渗透性好，土壤粘聚力小。

On the contrary , the cement contained in the underlying transition horizon and parent material horizon is less , the soil structure is loose , and permeability is good .

盆栽试验结果表明：土娄土覆盖层和黄土母质层中新固定态铵的释放率分别为98.32%和95.09%

The result of pot experiment displayed that the releasing ratio of the new fixed NH + 4 of overburden layer and loess parent material horizon in Lou soil was 98.32 % and 95.09 % respectively .

母质的两层性对土壤持水性能的影响

The Effect of Double-layer of Parent Meterial on Water-holding Capacity of Soils

C水平层是相对未风化的母质土，其它层的矿物都源于此。

Horizon C is relatively unweathered parent material form which the mineral components of the above layers are derived .

因为土壤母质相对稳定，母质层距地面生态系统较远，所以土壤有机碳含量最低。

Because the soil parent material is relatively stable , parent material farther away from the terrestrial ecosystems , so the lowest soil organic carbon content .