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本文对广西武鸣县黑荆树营养元素的组成特征以及营养元素与单宁相对含量、总量的关系进行了研究。结果表明：黑荆树强烈积聚微量元素Ｃｕ和Ｚｎ，Ｎ含量达到高量级水平，在化学组成上属于Ｎ＞Ｃａ＞Ｋ（Ｚｎ，Ｃｕ）型树种。树皮单宁含量受Ｎ，Ｐ，Ｍｇ三元素的综合作用极为显著，而单宁总量受Ｋ，Ｍｇ元素的综合作用极显著。在黑荆树成熟期，Ｐ，Ｋ对树皮单宁含量和总量有显著的促进作用，而Ｎ和Ｍｇ则发生抑制作用。
In this paper, the composition characteristics of nutrient elements and the relationship between nutrient elements and relative content of tannin were studied in Wuming, Guangxi. The results showed that the black wattle tree strongly accumulated trace elements Cu and Zn, the content of which reached a high order of magnitude, and its chemical composition was N> Ca> K (Zn, Cu). Bark tannin content by N, P, Mg three elements extremely significant effect, while the total amount of tannin by K, Mg elements of the combined effect of extremely significant. In the mature period of Wattle, P and K significantly promoted the content and total amount of tannin in the bark, while N and Mg inhibited them.