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通过对９ 个不同施肥处理的连栽地杉木针叶硝酸还原酶（ Ｎ Ｒ） 活力进行了比较研究， 结果表明： Ｎ 肥对 Ｎ Ｒ 活力作用显著， 但与 Ｐ配施如 Ｎ Ｐ、 Ｎ Ｐ Ｋ、 Ｍ （氮磷钾加微量元素混施） 效果更好； Ｋ 肥对 Ｎ Ｒ 活力作用不大， 在没有配施 Ｐ肥的情况下， Ｎ Ｋ 肥反而使 Ｎ Ｒ 活力下降。在施 Ｎ Ｐ Ｋ 的基础上， 配合施入由多种微量元素组成的复合微肥， 对提高杉木多代林个体组织 Ｎ Ｒ 活力作用明显。
The results showed that N fertilizers had a significant effect on N R activity, but no significant differences were found between N fertilizers and N fertilizers such as N P, N P K and M (N, P, K combined with trace elements) were better. K fertilizers had little effect on N R activity. N P fertilization did not decrease N R activity without P fertilizers. On the basis of application of N P K, application of compound micronutrient fertilizer composed of many trace elements has an obvious effect on improving N R activity of individual tissues of Cunninghamia lanceolata plantations.