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对 6~10年生幼中龄期直干桉人工林不同间伐量及施肥效应的对比试验结果表明, 不同间伐量及施肥对直干桉林木的生长和地上部分的生物量均存在显著的影响。此龄期的直干桉人工林以间伐后林木保留株数为 61株·m-2的林分为最佳。通过分析主伐保留株数对直干桉林分生长量、生物量的影响, 得知如果以径阶 18 22cm为培育目标, 此直干桉人工林最适宜的保留株数为 617 ~697株·hm-2。此外, 中龄期施肥有利于提高直干桉人工林的生长量、生物量和蓄积量, 故在生产中除幼龄期必须施肥外, 中龄期也应该适当施肥。
The comparative experiments on different thinning and fertilization effects of direct and eucalyptus plantations of 6 ~ 10 years old middle age showed that there were significant effects of different thinning and fertilization on the growth and aboveground biomass of Eucalyptus globulus forest. This age of straight-eucalyptus plantations to the number of trees after cutting the number of 61 plants? M-2 forest is best. By analyzing the influence of main cutting number on the growth and biomass of Eucalyptus urophylla, we found that if the diameter of 18 22cm is the breeding target, the optimum number of retained Eucalyptus urophylla plantation is 617 ~ 697 plants · hm- 2. In addition, the middle-aged fertilization is conducive to increasing the growth, biomass and accumulation of straight-eucalyptus plantations, so in the production of young adults must be fertilized, the middle age should also be appropriate fertilization.