Benchmark: Biomass Production in Eucalyptus Plantations as a Consequence of Fertilization

ABSTRACT The objective of this work was to evaluate the effects of fertilization, spatial arrangement and age on the biomass production in eucalyptus. The experiment was set up in a randomized block design with four replicates. Overall, 15 fertilizations adopted by forest companies in plots were evaluated, and two arrangements, 3.0 x 3.0 m and 6.0 x 1.5 m, were tested in subplots. Diameter at 1.30 m and total height were measured at 12, 24, 36, 48 and 60 months after planting to estimate trunk biomass. Dependence between commercial fertilization and arrangement were observed for trunk biomass. The biomass production rate in treatments where higher amounts of nutrients were applied decreased from the second year. The 3.0 x 3.0 m arrangement proved to be the most attractive option at 60 months using treatment with 2000 kg of agrosilicon, 400 kg of reactive phosphate, 130 kg of 04:26:16 + 0.5% Cu + 0.5% Zn and 150 kg of KCl + 1% B.

**摘要** 本研究旨在评估施肥措施、空间配置及林分年龄对桉树生物量生产的影响。本试验采用随机区组设计，设置4次重复。共评估了林业企业在试验样地中应用的15种施肥方案，并在副样地中测试了3.0×3.0 m与6.0×1.5 m两种种植空间配置。分别于造林后12、24、36、48及60个月测定林木胸径（1.30 m处直径）与总树高，以估算树干生物量。研究发现，商用施肥方案与种植配置对树干生物量存在显著交互效应。施入养分总量较高的处理组，其生物量生产速率自第二年起呈下降趋势。在造林后60个月时，采用2000 kg农用硅肥、400 kg活性磷肥、130 kg 04:26:16复混肥（添加0.5%铜与0.5%锌）及150 kg氯化钾（添加1%硼）的处理中，3.0×3.0 m的空间配置为最优选择。