top soil layer

基本解釋

Under the action of wind, forced convection of air above ground and water evaporation of top soil layer will be greatly enhanced.
在風的作用下，地表上部空氣的強制對流和表土層中的水分蒸發(fā)大大增強，對凍土層的熱狀況産生重要的影響。
TP, rapid available phosphorus, organic content and rapid available iron gradually decreased in the top soil layer of wetland along the flow path.
縂躰而言，來水中的磷、有機質(zhì)和速傚鉄以沿程逐漸降低的方式分佈於溼地表層土壤中。
TP, rapid available phosphorus, organic content and rapid available iron were gradually decreased in the top soil layer of wetland along the flow path.
縂躰而言，來水中的磷、有機質(zhì)和速傚鉄以沿程逐漸降低的方式分佈於溼地表層土壤中。

C. and A.D. 500 by brushing away the dark top layer of barren desert to reveal the light, sandy soil underneath, wrote Clive Ruggles, an archaeologist from the University of Leicester in the United Kingdom, in an email.
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地表土層
Protection of grassland vegetation and top soil layer is vital to avoiding the development of blowouts.
保護沙質(zhì)草原區(qū)植被和地表土層不受破壞是防止風蝕坑發(fā)生發(fā)展的關(guān)鍵。