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。

This means topsoil contains few of the ingredients needed for long-term successful farming.

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一旦扎根土壤，灌木林地就会生长茂盛，特别是在北极地区，因为北极地区的灌木丛比其他植物更善于利用土壤中的营养成分。

Once is established, shrubland thrives, particularly in the Arctic, because Arctic shrubs are good at taking advantage of increased nutrients in the soil, better than other Arctic plants.

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肥料供给土壤所缺乏的成分。

Manure supplies what is deficient in the soil.

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