不同树种混交对巨尾桉生长及林下植物多样性的影响

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中图分类号S750 文献标识码A文章编号 0517-6611（2025）16-0109-04doi：10.3969/j.issn.0517-6611.2025.16.024

Abstract[Objective]To provide scientific basis for management of Eucalyptus grandis ×E .urophylla mixed forest.[Method] To explore the effects of three treatment modes，pure stands of Eucalyptus grandisxE.urophylla（CK），Eucalyptus grandis ×E. urophylla-Acacia mangium mixed plantation（ M1 ），and Eucalyptus grandis×E.urophylla-Phoebe bournei mixed plantation（ M2 ），on the growth of Eucalyptus grandis ×E. urophylla and the diversity of understory vegetation，a plot survey method was employed.Growth parameters of Eucalyptus grandis ×E .urophylla，species compostion，anddiversityindicesofunderstoryegetationwereompaedamongtheheetreatments.esult]Tesultsoedatn mixedplantatioods，othcaciamangmndoebeoueiebiedetergowthithigfcantlyghertreeighttet breast height，and individual volume of Eucalyptus grandis ×E. urophylla compared to pure stands.However，there was no significant difference between the two mixed plantation modes.The number of understory plant species in the three modes was ranked as M2>M1> CK.Dominant speciesintheshrubandherblayersvariedamongdiferentmodes.TheShannon-WienerdiversityindexofshrubandherblayersinCKwaslower than that in M1 and M2 ，while the Pielou evenness index was higher than that in M1 and M2 .The similarity of understory plant communities between M1 and M2 was high，whileitwassignificantlydiferentfrom CK.Conclusion]Diferent mixedplantationmodescanbeadopted inthe management of Eucalyptus grandis ×E urophylla plantations to promote its growth and enhance understory vegetation diversity.

Key wordsEucalyptus grandis×E.urophylla ; Mixed planting;Growth ; Plant diversity

随着全球气候变化和人类活动的不断影响，森林生态系统的保护和可持续经营成为当今社会关注的焦点之一[1]桉树（Eucalyptus spp.）因其适应性强、生长快、产量高等特点被世界各国广泛引种，是重要的木材资源和生态系统组成部分[2-3]。（剩余7022字）