不同施肥方式对速生巨尾桉生长效果的影响

Effects of Different Fertilization Methods on Growth Effect of Fast-growing Eucalyptus grandis

为探讨施肥方式、坡位及肥料含量对速生巨尾桉生长量的影响,确定速生巨尾桉最佳施肥方案,以巨尾桉为试验对象,按不施肥、施基肥、施二次肥,采用上坡、中坡、下坡3因素3水平进行随机区组试验,调查各施肥方式下巨尾桉生长情况。结果表明:与不施肥相比,在下坡施二次肥时,巨尾桉的生长量最高,较不施肥分别增加33.33%、62.61%和0.99%,其差异均为极显著水平。在总施肥量一致的情况下,在下坡施二次肥时巨尾桉的生长量最高,其差异均为极显著水平;与对照(磷肥)相比,广西产桉树肥施入后巨尾桉的胸径和树高生长表现最好,其差异均为极显著水平。在不增加成本的情况下,巨尾桉施入广西产桉树肥时,于下坡二次施肥更有利于提高巨尾桉的生长量。

To investigate the effects of fertilization method,slope position and fertilization content on the growth of fast-growing Eucalyptus urophylla,and to determine the optimal fertilization program of fast-growing Eucalyptus urophylla,so as to provide theoretical basis for forest ecological prevention and social and economic development.This study was conducted in the state-owned Luojingzhang Forest Farm in Shanwei City in 2016.The growth characteristics of Eucalyptus grandis under different fertilization methods were investigated by using three factors and three levels random block test of ascending slope,middle slope and descending slope according to no fertilization,basal fertilization and secondary fertilization.Results:Compared with no fertilization,the growth of Eucalyptus grandis is the highest under secondary fertilization,which increase by 33.33%,62.61%&0.99%,respectively,with significant differences.Under the condition of the same total fertilizer application rate,the growth amount of Eucalyptus grandis is the highest when the secondary fertilizer was applied on the downhill slope,and the difference was extremely significant.Compared with the control(P fertilizer),Eucalyptus grandis(N-P-K:20%-7%-8%)showed the best growth in DBH and height,and the differences were extremely significant.Conclusion:When Eucalyptus grandis is applied in Guangdong province,secondary fertilization on downhill slope is more beneficial to increase the growth of Eucalyptus grandis without increasing the cost.