horizon n. 1.地平;地平线;地平圈。 2.地平仪,水平仪。 3.【地质学;地理学】地层,层位。 4.眼界,视界;范围,见识。 apparent horizon【气象学】视地平。 artificial [false] horizon人造地平。 celestial horizon【气象学】天球地平。 the horizon of knowledge 知识范围。 radar horizon雷达地平,雷达作用距离。 horizon of soil 土层。 true horizon【气象学】真地平。 visible horizon【气象学】可见地平。 Science gives us a new horizon. 科学使我们大开新的眼界。 widen one's horizon开阔眼界。 on the horizon 在地平线上,刚冒出地平线。
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。