珍贵树种林下套种广东紫珠的密度效应研究

Effects of Interplanting Density on Productivity of Callicarpa kwangtungensis in Mixed Forests of Valuable Tree Species

为了评价珍贵树种人工林下不同套种密度对广东紫珠Callicarpa kwangtungensis生长的影响,于7 a生降香黄檀Dalbergia odorifera-檀香Santalum album混交林下设置3个密度处理种植广东紫珠,即在行间套种1行、2行、3行,株距为0.8 m,分别于定植后6、12和18个月调查其地径、树高和生物量。结果表明:3个套种密度处理间广东紫珠地径差异不显著(P≥0.05),而高生长在各时间段均差异显著(P <0.05),单株生物量差异极显著(P <0.01),表现出随密度增加而升高的趋势。本研究筛选出降香黄檀-檀香混交林下套种广东紫珠的适宜密度为行间栽种3行(12 500株·hm^-2),6个月收获1次,每年可采收广东紫珠1 479.08 kg·hm^-2(鲜重),收入可达5 916.33元·hm^-2,可显著增加林农短期收益,为珍贵树种规模发展提供了一种实用可行的经营模式。

Compound management model is the trend of developing understory economy. Different density of Callicarpa kwangtungensis were established as intercrops in experiments at Gaoming county, Guangdong Province. One, two and three lines of C. kwangtungensis were planted between the rows of valuable species respectively. Height, ground diameter, and biomass were measured at 6 months, 12 months and 18 months. There were significant differences of the C. kwangtungensis heights between different densities at different time, but ground diameters didn't have. There were significantly positively correlations between density and individual tree biomass of C. kwangtungensis at different time. According to the results, the yearly yield of C. kwangtungensis is 1793.955 kg · hm^-2 fresh weight under the best density and harvest time. Useful attempts were conducted with intercrop medicinal plant with valuable trees.