施肥对尾叶桉萌芽林生长的影响

尾叶桉萌芽林的施肥研究较少,国内的桉树施肥研究主要集中在第1代苗木造林。本试验研究结果表明,施肥对尾叶桉萌芽林当年高生长有极其显著的促进作用,并随施肥量的增加而提高,但随着时间的推移,这种高生长与施肥量成正相关的关系不断减弱。对胸径生长的调查结果有与同高生长相一致的规律,随时间的推移处理间的差异不断变小。对比树高生长,处理间胸径的差异更加显著,直至施肥后3a,在P＝0.1水准上仍然差异显著。施肥促进高、径生长的同时,提高了材积和出顶率,从而明显提高了利润。但对比尾叶桉实生林更加显著的施肥效果,建议把有限的肥料用于实生林施肥,将更大程度地提高其产量和经济效益。

Effect of Fertilization on Productivity of Second Rotation Coppice of Eucalyptus urophylla in South China

Most of fertilization trials of eucalypt plantations are for first rotation seedling plantations. There are very few reports on effect of fertilization on second rotation coppice. The study in Huadu of Guangdong Province shows that fertilization significantly increased tree height and diameter growth. But the increment decreased with time. At year 3, the effect of fertilization was significant at p=0.10. However, the best fertilization treatment increased productivity of second rotation coppice by more than 50% over the treatment without any fertilizers and fertilization increased economic benefit of second rotation coppice. Comparing with first rotation seedling plantation, effect of fertilization on second rotation coppice is lower.