自然土壤中富含腐殖质的表层土壤，以A1表示。土体较为疏松，有良好结构。草原土壤腐殖质含量高达5—10%以上，厚度达50—100厘米。森林土壤厚度一般小于50厘米，腐殖质含量高者在5%以上。
... humus fractionation 腐殖质分级 humus layer 腐殖质层 humus silicate soil 腐殖质硅酸盐土 ...
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... Column cover mould 柱盖板 Airbag switch cover mould 安全气囊开关盒 mould cover 腐殖质层 ...
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... blocking layer to layer adhesion 带间粘着性 h layer humus layer 腐殖质层 layer by layer manuring 分层施肥 ...
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一旦腐殖质层消失，养分就无法从土壤中回收和过滤，致使土壤由肥沃变为贫瘠，只适于热带草原植被的生长。
Once the humus layer disappears, nutrients cannot be recycled and leach from the soil, converting soil from fertile to infertile and making it suitable only for savanna vegetation.
土壤腐殖质层可被定义为在草皮与土壤表面之间的一层有机残留物。
Thatch can be described as the layer of organic residue located immediately between the sward and the soil surface.
砂岩发育的土壤主导因子是土层厚度、非毛管孔隙度和腐殖质层厚度。
The major factors of the soil developed from arenite were soil-layer depth, non-capillary porosity and humus depth.
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