北方典型区域果园表层土壤农药类POPs残留特征分析 关键词：POPs；果园；表土；残留特征；典型区域 [gap=2150]Keywords：POPs；orchard；topsoil；remaining characters；typical production zone
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imported topsoil 外来表土
topsoil stripping 挖除表土
Topsoil Loss 表土流失
Urban topsoil 城市表层土壤
spongy topsoil 松软的表土
N-UNCOUNT Topsoil is the layer of soil nearest the surface of the ground. 顶层土
This means topsoil contains few of the ingredients needed for long-term successful farming.
这意味着表层土壤几只含有少量长期成功耕作所必需的成分。
Because of this increased concentration, regrowth of plants is minimal, leading to increased erosion, which leads to a decrease in the fertile topsoil, leading to even less regrowth.
由于浓度的增加，植物的再生长很少，导致侵蚀增加，使得肥沃的表层土壤减少，再生长更少。
As it crashed down the steep mountainside like a gigantic snowplough, it swept up trees, boulders and tons of topsoil, and completely crushed and destroyed the six villages that lay in its path.
它像一台巨大的扫雪机一样冲下陡峭的山坡，卷走了树木、巨石和成吨的表土，将沿途的六个村庄彻底摧毁。
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