This study revealed the specific effects of harvesting intensity on the growth and canopy structure of eucalyptus trees by conducting a comparative analysis of key growth parameters under dif-ferent harvesting intensities,including stand height,diameter at breast height(DBH),individual tree volume,leaf area index(LAI),mean leaf angle(MLA),and canopy openness.The findings provided important scientific reference and practical guidance for thinning strategies and sustainable manage-ment of eucalyptus plantations.The specific research results are as follows:(1)As harvesting inten-sity gradually increases,a certain decreasing trend was observed in the LAI of eucalyptus trees,with a reduction in MLA and a corresponding significant increase in canopy openness;(2)Under high-in-tensity harvesting(HT treatment)conditions,the average DBH and individual tree volume of euca-lyptus trees reached their maximum values,with significantly higher differences compared to the con-trol group(CK)without harvesting;(3)Harvesting intensity showed a significant positive correlation(P＜0.05)with DBH and an extremely significant positive correlation(P＜0.01)with canopy open-ness,while it exhibited a negative correlation with LAI and MLA.In summary,harvesting intensity has a positive impact on the canopy structure and stand growth of eucalyptus plantations.A moderate increase in harvesting intensity favors an increase in canopy openness,improves light conditions with-in the forest,and promotes the growth of individual DBH and the accumulation of individual tree vol-ume in eucalyptus trees.This study provides scientific basis for silvicultural practices and research on the targeted cultivation and sustainable management of large-diameter eucalyptus trees.
维普
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