不同修枝强度下的长白落叶松节子属性模型构建

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中图分类号：S723.5文献标志码：A

文章编号：1673-923X（2026）03-0045-11

Modeling knotcharacteristicsofLarixolgensisunder different pruning intensities

LITong1，JIAWeiwei¹，LIZelin1，ZHAOGuoqiang

restry，NorthastForestryUersityarbino，Hilonjang，hina;2.Forestagementepartment，io ForestryBureauCo.，Ltd.，Mudanjiang1576oo，Heilongjiang，China）

Abstract：【Objective】ThisstudyaimedtoinvestigatetheefectsofdiferentpruningintensitiesonknotsizeinyoungLarixolgesis plantations.Method】ThirtyyoungL.olgensistreesfromtheMengjiagangforestfarinHeilongjiangProvincewereselectedas sample treesand subjected to four pruning intensities 0% 20% 30% ，and 40% ）.Knotdissectiondatawere collected，and mixed-effect modelsforkoteter（KD），soudotlgth（KL），ndlooseotlength（LK）wereonstructeditrugiteit effect.Tesemodelswrecompaedwithbaseliemodelstoevalatetefectsofpruningonknoatributes.【Result】Comparedwith baseline models，themixed-effect models performed beter in terms ofRMSEand MAE，with R2 valuesof0.724，0.826，and 0.308 for KD，SKL，andLKL，respectively，predictionaccuracy exceeded 94% ，indicating that mixed-effect models provided reliable predictions ofknot properties.Artificial pruning significantly reducedknot influence in L .olgensis.Undermoderatepruning 30% ），SKLincreased by 0.46cm compared with unpruned trees，whileKD and LKL were reduced by 0.14cm and 0.31cm ，respectively.This suggests that moderate pruningpromoteshealthybranchgrowthwhileefectivelyreducing theformationoflooseknots.【Conclusion】Thisstudy confiredtheelabilityofmixd-efftmodelsinpredictigkarbtes，demonstratigteirabilitytosimulatethectsofpring intensity on knot development.Among different pruning intensities，moderate pruning （30%） showed the best performance in controlling knotsize，reducingLKLwhilemaintainingstemstability. Underthestudyconditions，itrepresentsareasonablepruningstrategy.

Keywords：Larixolgensisplantation;mixed-effectsmodel;artificial pruning;knot

长白落叶松Larixolgensis是东北地区大径材培育树种之一，其木材密度适中，结构坚实，且具有强抗压抗弯特性，是一种重要的木材资源。（剩余17146字）