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采用田间定位试验方法,研究了追施氮肥当年与翌年对桉树各部位生物量和氮贮量的影响。结果表明:与对照相比,追施氮肥翌年桉树生物量增加幅度显著高于当年,说明氮肥对于提高桉树生物量具有一定累积作用,追肥的增产效果明显;追施氮肥也使全树氮贮量在2007年与2008年分别提高30.2%和73.5%;与2007年相比,2008年对照处理桉树生物量增加35.9%,追施氮肥处理生物量提高1倍以上,而对照处理树木体内氮贮量降低13.1%,追氮处理提高15.7%;这主要是由于3龄桉树树叶生物量的明显降低,对照与追施氮肥处理树叶中氮贮量分别降低46.5%和36.9%,其也是桉树中氮贮量降低最显著的部位。
The field experiment was conducted to study the effects of topdressing nitrogen fertilizer on the biomass and nitrogen storage of various parts of Eucalyptus in the same year and the following year. The results showed that compared with the control, the increase of biomass of eucalyptus in the following year was significantly higher than that of the control, indicating that nitrogen fertilizer had a certain cumulative effect on increasing the biomass of eucalyptus and the effect of top dressing was obvious; Increased by 30.2% and 73.5% respectively in 2007 and 2008; compared with 2007, the biomass of eucalyptus increased by 35.9% and the biomass of topdressing nitrogen fertilizer increased by more than 1 times in comparison with that of 2007, while that of control trees Which is mainly due to the obvious decrease of the biomass of the leaves of the 3rd instar eucalyptus. The nitrogen storage in the leaves of the control and topdressing fertilizers decreased by 46.5% and 36.9%, respectively, which is also the storage of nitrogen in the eucalyptus The most significant part of the amount of reduction.