... thin soil 瘠土 three essential nutrients 养分三要素 three phases of soil 土壤三相 ...
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Nitrogen is one of the three essential nutrients in the terrestrial ecosystem and is regarded as a main limited factor in the forest ecosystem.
氮是陆地生态系统中三大营养元素之一,在森林生态系统中被视作主要的限制生长因子。
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