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研究了施用氮肥和磷肥对短枝木麻黄幼苗总酚(total phenolics,TP)和可溶性缩合单宁(extractable condensed tannin,ECT)含量的影响,探讨短枝木麻黄单宁形成的养分效应.结果表明:施加氮肥使短枝木麻黄幼苗小枝的TP和ECT含量显著降低,支持碳氮平衡假说和生长分化平衡假说,但对氮含量没有显著影响,从而导致TP/N和ECT/N降低;施加磷肥对TP和ECT含量没有显著影响;随着处理时间的延长,短枝木麻黄幼苗小枝TP含量升高了9.91%～14.32%,而ECT含量降低了14.32%～298.88%;TP或ECT与有机物质含量的关系则相反,表明不同类型单宁的合成途径不同,但由于TP和ECT均与氮含量无显著相关性,故不支持蛋白质竞争模型;在贫瘠土壤条件下,TP/N和ECT/N的水平较高,有利于提高短枝木麻黄的防御水平,降低凋落物的分解率,减少养分损失,从而保持较高的生产力.
The effects of nitrogen and phosphate fertilizers on the total phenolics (TP) and soluble extract tannin (ECT) content in spruce branching shoots were studied, and the nutrient effect on the formation of tannin : The application of nitrogen fertilizer significantly reduced the TP and ECT contents of spruce shoots, supporting the hypothesis of carbon-nitrogen balance and the balance of growth and differentiation, but had no significant effect on the nitrogen content, resulting in the decrease of TP / N and ECT / N. TP and ECT content had no significant effect. With the prolongation of treatment time, the TP content of Spur epimedium seedlings increased by 9.91% -14.32% and the ECT content decreased by 14.32% -298.88% However, TP and ECT did not support the protein competition model because TP and ECT had no significant correlation with nitrogen content. Under poor soil conditions, TP / N and ECT / N Higher level, which will help to improve the defensive level of Casuarina equisetifolia, reduce the decomposition rate of litter, reduce nutrient loss and maintain high productivity.