蓝桉幼林施肥效应研究

在云南省保山市石灰岩红壤地区进行了历时4年的蓝桉幼林N、P、K不同配比的10种处理施肥试验。结果表明，施肥能明显促进蓝桉（Eucalyptusglobulus）幼林的生长；其中处理6、9、10增产效果极显著，树高增加16．31％～20．40％，胸径分别增加18．78％～19．21％，材积增加65．04％～70．19％。有机肥对蓝桉生长有促进作用，施过有机肥的处理10生长始终保持优势；磷肥是蓝桉增产的主要因素，每株施430g钙镁磷肥做底肥能使树高、胸径分别增加14．67％、15．87％，每株施215g钙镁磷肥则树高、胸径分别增加11．44％、7．83％；氮肥各水平间无差异，增产效果不明显；钾肥1、2水平间无差异，3水平可能过量，阻碍了肥效发挥。施肥能提高蓝桉生产的经济效益，较好的几个处理依次为6、9、2、10、3产出投入比值均大于对照。综合以上几个因素，N2P3K2为蓝桉幼林的最佳施肥方案。

Study on the Effect of Fertilization on Young Eucalyptus globulus Plantation

10 fertilization tests of different match and ratio of N, P, K were conducted on young Eucalyptus globulus plantation in limestone red soil in Baoshan city for 4 years.The results of tests indicated that fertilization promoted the growth of young Eucalyptus globulus plantation, among the 10 treatments, the 3 treatments of No.6, 9, 10 gained remarkable growth effect, tree height increased by 16.31%~ 20.40%, DBH increased by 18.78% ~19.21%, volume increased by 65.04% ~ 70.19%. The application of organic fertilizer can make the trees maintain dominant position throughout, the treatment 10 is a example. Phosphoric fertillzer is the main factor in growth of Eucahatus globulus Appling 430g fused calciummagnesium phosphate as base fertilizer can make tree height and DBH increase by 14.67% and 15.87% respectively, while adopting the amount of fertilizer applied of 215g, the rate of increase of tree height and DBH are 11.44% and 7.83% respectively.There is no diference on the effect of nitrogen application between every 2 application rates and the effect of growth increase isn't obvious. There is no difference on the. effect of potash fertilizer between No.1 and No.2 application rates, and maybe the No.3 is over dose, so the effect of fertilizer has been hindered. Fertillzation can increase economic efficiency of Eucalyptus globulus production, the several treatments with better effects, in order of favourable effect, were No.6, 9, 2, 10, 3, and all with specific value of output and input higher than that of control. Synthesizing these factors afforementioned, the best fertilizer scheme in young Eucalyptus globulus plantation is N2P3K2.