直干桉人工林幼中龄不同间伐量及施肥的对比试验

Comparison Experiment of Tending Felling Amount and Fertilization of Young and Middle-aged Eucalyptus maidenii Plantation

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。

Comparative experiment of different tending felling amount and fertilization was carried out on Eucalyptus maidenii plantation of 6 to 10 years old. The experimental results showed that different tending felling amount and fertilization significantly affect the growth of trees and above ground biomass. The optimum maintaining density for E.maidenii at this age after tending felling is 613 trees/hm^(2). Through analyzing the effect of maintaining number of trees on growth increment and biomass, it was found that with the management objective of 18～22 cm in diameter, the optimum maintain number was 617~697 trees/hm^(2). Fertilization on middle-aged can improve the growth increment, biomass and volume of E.maidenii plantation. It is therefore suggested that besides fertilization at young stage, proper fertilization should be applied on middle-aged forests.