两种施肥措施对尾细桉的生长影响

采用同基肥条件下施用不同量追肥及同质量下NW和HY两种不同肥料的施肥措施，对处于该措施下的尾细桉生长状况进行研究。结果表明：不同追肥量下，追肥量为2500 g的F1000-1-HY处理效果最佳，胸径和树高均优于其他处理。建立追肥量与17个月生和30个月生尾细桉的树高、胸径关系显示，树高均以线性拟合效果较好，拟合度分别达0.6211和0.8148；胸径均以二次函数拟合较好，拟合度分别达0.7399和0.7186。同质量的NW肥和HY肥处理下，HY肥优于NW肥，二者相对于对照组在17个月生和30个月生时，材积分别提高了140%、100%和157%、121%。

Effects of Two Fertilizer Treatments on Growth ofEucalyptus urophylla ×E. tereticornis

The growth ofEucalyptusurophylla ×E. tereticornis following application of differing amounts of each of two types of additional fertilizer （NW, HY）, with a standard base fertilizer, was examined in this study.The treatment of F1000-1-HY involving 2.5 kg additional fertilizer provided superior tree height and diameter at breast height compared to other treatments. A relationship was developed to explain the height and diameter at breast height of the Eucalyptus urophylla × E. tereticornis given differing amounts of additional fertilizer. To ages of 17 and 30 months, tree height could be explained by linear functions, with the degrees of fit of 0.62 and 0.82 respectively. A quadratic function provided better fit for diameter at breast height, with degrees of fit of 0.74 and 0.72 respectively. HY fertilizer proved better than the NW fertilizer, even though both supposedly provided the same amount of key nutrients. Contrasting the control group, the volume of timber provided by HY and NW fertilizer increased by 140% and 100% to age 17 months respectively, and then 157% and 121% to age 30 months respectively.