桉树与火力楠混交林根系生物量分析  

Analysis of Root Biomass in the Mixed Forest of Eucalyptus and Michelia macclurei

作　　者：韦海 庞宇超 冯俊源 朱贵华 WEI Hai(Guangxi State-owned Bobai Forest Farm,Bobai,Guangxi537600)

机构地区：[1]广西壮族自治区国有博白林场,广西博白537600

出　　处：《园艺与种苗》2024年第8期42-44,共3页Horticulture & Seed

摘　　要：[目的]营建材用树种混交林是实现林业提质增效的有效途径之一,研究混交林树种根系生物量的差异及其变化规律有利于掌握树种间的搭配适应性及混交效果。[方法]以广西国有博白林场10年生桉树与火力楠混交林及其纯林对照为研究对象,采用标准木全挖法研究混交林与纯林对照林分间根系生物量。[结果]10年生时,不同林分类型根系生物量存在显著差异,混交林中桉树及火力楠根系单株总生物量分别为41.309、47.661 kg。混交林中桉树单株根系总生物量高于纯林对照20.83%;而混交林中火力楠单株根系生物量略低于对应纯林对照;混交林及其对照单位面积总生物量分别为70.92、67.95、52.82 t/hm^(2);混交林单位面积生物量较桉树纯林对照提高28.64%。[结论]桉树+火力楠混交林林分各径级根系生物量大小顺序为:根兜>粗根>中根>细根。桉树+火力楠1∶2混交造林模式有助于桉树大径材培育及混交林生产力的提升。[Objective]Mixed forest of building materials and tree species was one of the effective ways to improve the quality and efficiency of forestry.Studied the differences and changes in root biomass of mixed forest species was beneficial for understanding the adaptability of tree species and the mixed effect.[Method]The root biomass of the mixed forest of 10-year-old Eucalyptus and Michelia macclurei and its pure forest control in Guangxi State-owned Bobai Forest Farm was studied using the standard wood excavation method.[Result]At 10 years of age,there were significant differences in root biomass among different forest types.The total biomass per plant of Eucalyptus and M.macclurei in the mixed forest was 41.309 kg and 47.661 kg,respectively.The total root biomass of individual Eucalyptus trees in mixed forests was higher than that in pure forest controls,with an increase of 20.83%;In mixed forests,the root biomass of individual M.macclurei plants was slightly lower than that of the corresponding pure forest control;The total biomass per unit area of the mixed forest and its control was 70.92,67.95,and 52.82 t/hm^(2),respectively;The biomass per unit area of mixed forests increased by 28.64%compared to pure Eucalyptus forests.[Conclusion]The order of root biomass of different diameter classes in the Eucalyptus and M.macclurei mixed forest was:root pocket>coarse root>medium root>fine root.The 1∶2 mixed afforestation model of Eucalyptus and M.macclurei is beneficial for the cultivation of large-diameter Eucalyptus trees and the improvement of mixed forest productivity.

关 键 词：桉树 火力楠 混交林 根系生物量 

分 类 号：S72[农业科学—林木遗传育种]