施肥对蓝桉幼林生长的影响

经５ａ研究结果表明，在省保山市石灰岩红壤区施肥能明显促进蓝桉幼林生长，肥效在１．５ａ时最大，９个施肥处理的树高、胸径平均增长３３．６９％、４８．３９％，造林后５ａ时，生长反应已经呈下降趋势，９个施肥处理的树高、胸径平均增长１６．４５％、１０．７１％。Ｐ 促进蓝桉增产的主要因素，每株施４３０ｇ钙镁磷肥的几个处理产好，Ｎ、Ｋ肥增产效果不明显，有机肥对蓝桉生长有促进作用。在９个施肥处理中，处理６（钙镁磷

Study on the Effect of Fertilization on Eucalyptus globulus Plantation in Yunnan

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 5 years. The results of tests indicated that fertilization obviously promoted the growth of young E. globulus plantation. At 1.5 years after afforestation,the growth response was at the highest point,the height and DBH of the tree were promoted by 33.69%,48.39% for the 9 manuring treatments. At 5 years after afforestation,the growth response were promoted by 16.45%,10.71% for the 9 manuring treatments. Phosphoric fertilizer is the main factor in promoting the growth of E. globulus plantation.Applying 430 g calcium magnesium phosphate as base fertilizer for each tree,can make the best growth response. The growth responses of N,K fertilizer is not obvious. Organic fertilizer can promot the growth of the trees. Among the 10 treatments,the 3 treatments of No.6 (65 g carbamide,430 g calcium magnesium phosphate),No.9 (130 g carbamide,430 g calcium magnesium phosphate ,54 g KCl),No.10 (treatmet No.9 added with 5 kg organic fertilizer) gained remarkable growth effect. The treatments with best economic benefit are No.6 and No.9.