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ID:37408025
大小:1007.66 KB
页数:35页
时间:2019-05-23
《大青山油松人工林密度对林木生长影响的研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要本文以大青山阴坡30a油松人工林为研究对象,测定研究了不同密度油松人工林胸径、生物量、叶面积指数等,研究结果表明:(1)蓄积量、木材密度、高径比、枝下高与林分密度呈正相关;单株材积和平均胸径在2200株恤2.--3300株/hm2密度范围变化较大,与林分密度呈负相关。(2)当密度由2200株mm2增加到3300株/hm2时,单株地上生物量从22.48kg减小到13.04kg;各器官生物量分配比例树干占48.700.4~60.35%,树枝占21.17%—26.35%,树叶占9.47%~1492%,树皮占729%-12.95%,果占o.45%~1.94%。(3)对树干解析结果分析指出,径生长速
2、率随树龄而变化,不同密度林分最大径生长速率的树龄也不同,当密度3307株/hm2时为27a,而密度2202株]hl-n2、2933株mm2和4463株/hm2时为21-24a。(4)对阴坡不同坡位胸径总生长量结果分析指出,阴坡中部胸径小于阴坡上部和下部。树龄为30a时,中部胸径为5.83cm,上部和下部分别为7.10cm和6.53cm。最大径生长速率的树龄阴坡下部小于中部和上部,为lga,上部和中部大于21a。(5)30a油松人工林叶面积指数与密度无显著相关性,在被试的密度范围内(2202-4463株/hm2)各样地平均叶面积指数在6.334m2/m2左右。关键词:油松人工林;林分密度;生物量
3、;叶面积指数;木材密度TheStudyontheRelationshipBetweenStandDensityandGrowthofForestintheArtificialPinustabulaeformisForestintheDaqingMountainAbstractartificialPinustabulaeformisforestof30yearsoldonDaqingMountainwasstudiedinthisarticle.theanalysisofthegrowthprocedure,biomassandLAIofdifferentdensitiesinthesimila
4、rsiteconditionshow:(1)Theamountofgrowingstock,thetimberdensity,theratiobetweenheightanddiameterbreastheightandthetimberheight.allthesehavepositivecorrelationwiththestanddensities,thetimbervolumeandthemeandiameterbreastheightchangegreatatthestanddensitiesrangeof2200~3300stock/haandhasnegativecorrelat
5、ionwiththestanddensities.(2)Individualbiomassabovethegrounddecreasefrom22.48kgto13.04kgasthestanddensityincreasefrom2200to3300stock/ha;Thedistributionofthebiomassoftheindividualorganis廿latstockoccupies48.70%-60.35%,branchesoccupy21.17%~26.35%,leavesoccupy9.47%~14.92%codexoccupies7.29%~12.95%,conesoc
6、cupy0.45%~1.94%.(3)Treeanalysisshows,thegrowthspeedofthediameterbreastheightchangeswiththetreeage,thebiggestspeedisdifferentinthedifferentsamplearea,itis27awhenthestanddensityis3300stock/ha.删leitis21~24awhenthestanddensityis2202,2933and4463stock/ha.(4)Theresultofthetotalgrowthof;hediameterbreastheig
7、htonthedifferentsiteofnorthernslopeofmountainsshows,thediameterbreastheightinthemiddleslopeissmallerthanthetopandthebase.Ⅵmentheageoftreesis30a.thediameterbreastheightinthemiddleis5.83cm.inthetopis7.1
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