topsoils(表土层), 此释义来源于网络辞典。
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humus content of topsoils 表土的腐殖质含量
floodplain topsoils 河滩表层土
humus s content of topsoils 表土的腐殖质含量
·2,447,543篇论文数据，部分数据来源于NoteExpress
同义词： surface soil
以上来源于: WordNet
N-UNCOUNT Topsoil is the layer of soil nearest the surface of the ground. 顶层土
The organic matter content as well as the total and available contents of nutrients increased at the first 2~5 years, and then declined rapidly, especially for those in topsoils.
土壤有机质含量、全量养分含量和速效养分含量均在采伐初期2～ 5年增加，随后又迅速减少，尤其是表层土壤变化更为明显；
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