surface horizon meaning in Chinese

地表土层

Significant seasonal changes of microbial numbers were observed in surface horizon
Cm深土壤细菌生物量有明显的季节性变化，从
Denitrification and nitrogen fixation in 10 cm 20 cm horizon are higher than those in other soil horizons , in which the partial pressure of oxygen is lower than that in surface horizon , and the number of microorganisms is more than that in below horizon
高寒草甸土壤中未发现有好气性自生固氮菌，但嫌气性自生固氮菌的数量众多。在高寒草甸严酷的自然条件下，嫌气性自生固氮菌为大气氮素固定的主要承担者。
2 . the diagnostic surface horizons divided on the soils of the area are mollic epipedon , umbric epipedon and ochric epipedon . the diagnostic subsurface horizons are cambic horizon , argic horizon , histic evidence and mattic evidence . the diagnostic characteristics are sapric soil materials , folic soil materials , soil moisture regimes , soil temperature regimes , ferric property and base saturation
本地区土壤划分出的诊断表层有暗沃表层、暗瘠表层和淡薄表层，诊断表下层有雏形层、粘化层，诊断现象有有机现象、草毡现象，诊断特性有6个：高腐有机土壤物质、落叶有机土壤物质、土壤水分状况、土壤温度状况、铁质特性、盐基饱和度。