人工林土壤全氮与土壤有机碳含量之间呈显著的线性正相关。
The contents of total nitrogen had a significant positive relationship with the soil organic carbon.
实验研究了施氮对大豆全氮含量的影响。
Experimental study on the nitrogen of total nitrogen content of soybean.
三个林型表层土壤全氮含量季节变化规律明显不同，总体变化幅度都不大。
Total nitrogen contents of surface soil in three forest types changed with seasons distinctly, and overall extents were not big.
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