林分密度对桉树幼龄能源林的影响

对0.5年生3种不同密度配置的幼龄尾巨桉优良无性系DH32-29各器官生物量、热值以及灰分进行了调查和测定,结果表明:所选3种密度间树高差异显著,基径差异达到极显著水平,随着密度的增加,树枝、叶片、树干的生物量分别呈现减少趋势,密度与树枝和树干生物量的相关性达到了0.01极显著水平;单株生物量随密度的增大而减小,林分生物量则相反;单株热值无显著差异,仅单株平均灰分含量高密度与中密度存在显著差异。综合分析,高密度0.25 m×2 m林分生物量最大,其灰分含量比低密度的林分低,适合作为能源林培育密度。

Effects of Different Stand Densities on Young Eucalypt Energy Forest

Stands of 0.5 year old DH32-29 eucalypt clone with three stand densities for energy-forest were investigated.Growth,biomass and calorific value of different organs from their stands were analyzed,the results showed that effect of three stand densities on height growth was obvious and differences of stem base diameter were significant;biomass of leaf,branch and stem-wood decreased as the stand density increased,and the correlation between density and the biomass of branch and stem-wood reached 0.01 significant level;the individual plant biomass decreased with stand density increasing while stand biomass was on the contrary.Average calorific value of individual plant had no significant difference,while the differences of individual plant ash contents between stands with high density and medium density reached significant level.Stands of high density 0.25 m×2 m had the highest biomass and the lowest ash content,it could be used for energy-forest.