不同造林密度及坡位对柠檬桉幼林生长的影响  

Effects of Density and Slope on Growth of Young Corymbiacitriodora Plantations

作　　者：李秋荔 范建新 林正聪 唐靖 陆艳柳 田红 LI Qiuli;FAN Jianxin;LIN Zhengcong;TANG Jing;LU Yanliu;TIAN Hong(Guangxi State-owned Qinlian Forest Farm,Qinzhou 535099,Guangxi,China)

机构地区：[1]广西国有钦廉林场,广西钦州535099

出　　处：《桉树科技》2023年第3期26-30,共5页Eucalypt Science & Technology

基　　金：中央财政林业科技推广示范项目([2021]TG15号)。

摘　　要：为探索柠檬桉合理的种植坡位和密度,达到提升人工林生长效益的目的,以1.5年生柠檬桉幼林为对象,选用4个造林密度和3个坡位进行造林试验。结果表明1.5年生柠檬桉的不同造林密度各径阶分布均较均匀,分布在0-5径阶,其中主要集中在2-3径阶,同密度各径阶株数呈极显著差异。双因素影响下柠檬桉生长的方差分析显示,不同造林密度、不同种植坡位对柠檬桉的生长指标有一定影响,其中坡位的影响显著。在1.0 m×1.5 m、1.5 m×2.0 m、2.0 m×2.0 m的种植密度下,同一造林密度的树高、胸径、材积总体表现为:下坡≥中坡>上坡,在种植密度为1.0 m×1.5 m的材积和1.0 m×2.0 m的树高、胸径、材积上,表现为中坡>下坡>上坡。总体病虫害发生率均低于20%,其中最高的为1.5 m×2.0 m种植密度的中坡(19.5%),而2.0 m×2.0 m种植密度的上中下坡未发现病虫害。综合比较,以1.0 m×2.0 m种植密度在中坡的树高、胸径、材积表现最好,且病虫害发生率最低,初步确定广西钦州地区柠檬桉合理造林密度为1.0 m×2.0 m。In order to explore effects of planting position and density on growth of Corymbia citriodora and to improve plantation growth efficiency,four planting densities and three slope positions were analysed in 1.5-year-old C.citriodora plantations.The results show that diameter class distributions were relatively uniform across variations in these plantation configurations,with diameters distributed in the range of 0-5 cm and,mainly concentrated in the 2-3 cm class.Different planting densities and slope positions had clear effects on growth,with the effects of the latter being significant.Under all the planting densities of 1.0 m×1.5 m,1.5 m×2.0 m and 2.0 m×2.0 m,the tree height,DBH and volume were as follows:downhill≥middle slope>uphill slope.For a density of 1.0m×2.0 m tree height,diameter and volume showed performance varying by slope position in the order:middle slope>downhill slope>uphill,as did tree volume at a planting density of 1.0 m×1.5 m.The overall incidence of pests and diseases was lower than 20%,with the highest incidence being found in the middle slope with 1.5 m×2.0 m planting density(19.5%),while no pests and diseases were found in the upper,middle and lower slopes with 2.0 m×2.0 m planting density.By comprehensive comparison,the height,DBH and volume of trees with 1.0 m×2.0 m planting density in the middle slope showed the best performance,and the incidence of diseases and pests was the lowest.

关 键 词：柠檬桉 造林密度 坡位 生长量 

分 类 号：S792.39[农业科学—林木遗传育种]