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《北京地区40a生油松人工林密度效应的研究-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、2014年8月林业资源管理August2014第4期FORESTRESOURCESMANAGEMENTNo.4北京地区40a生油松人工林密度效应的研究公宁宁,王小平,李皓,马履一,贾忠奎,段劫,林平(1.北京林学会,北京100029;2.北京林业大学,北京100083)摘要:以20块6种不同密度梯度的北京地区低山阴坡厚土40a左右油松人工林为研究对象,分析其林分生长、树冠生长、林下植物多样性以及林下生物量对林分密度的响应关系,研究结果表明:胸径、树高、冠幅随林分密度的增大而减小,当林分密度增大到1500hm
2、时,减小的趋势趋于稳定;枝长平均生长量、连年生长量均随年龄的增大有先增加后下降的趋势,林分密度>1500~/hm2时,枝生长量下降趋势明显;枝材积生长量在各年龄阶段的变化也随林分密度的增大表现出抑制响应,与枝长生长量的变化规律类似;林下灌木、草本物种均匀度指数Jsw,Simpson多样性指数和Shannon—Wiener多样性指数均随林分密度的增大而减小;随林分密度的减小,草本层生物量逐渐增加,灌木层生物量先增加后略减,林分密度为1000~1200株/hm时灌木生物量最大,为3802.94kg/hm。对于北
3、京低山阴坡厚土40a左右的油松人工林来说,经营密度宜为1000~1500hm。关键词:油松人工林;林分密度;树冠生长;植物多样性中图分类号:$718.5;$750文献标识码:A文章编号:1002—6622(2014)04—0085—07DOI:10.13466/j.cnki.1yzyg1.2014.04.017ManagementDensityEfectsofPinusTabulaeformisPlantationinBeijingGONGNingning,WANGXiaoping,LIHao,MALuyi
4、,JIAZhongkui,DUANJie,LINPing(1.Be~iingForestrySociety,Beijing100029,China;2.BeijingForestryUniversity,Beijing100083,China)Abstract:Thispaperstudiedthechangesinstandgrowth,understoryplantdiversity,forestbiomassandcrowngrowthofPinustabulaeformisplantation(40
5、yearsoldorso)underthedifferentconditionsofstanddensityatlOWhillshadeslope.Resultsshowedthat:DBH,treeheight。crownwidthdecreasedwithstanddensityincrease.whenstanddensityincreasesto1500individualsperhectare.thereducedtendencywastostabilize.Theaverageamountofb
6、ranchlengthgrowth,yearafteryearvolumegrowthincreasedwithageincreaseandthendecreasedafterwards.Withstanddensity>1500individualsperhectare,theaveragea-mountofbranchlengthgrowthdecreasedsignificantly.Branchvolumeincrementalsoincreaseswithstanddensitythatshows
7、inhibitionofresponse.andtheamountofbranchlengthvariationofasimilargrowth.Asstanddensityincreases,theunderstoryshrubs,herbaceousspeciesevennessindexJsw,SimpsondiversityindexandShannon—Wienerdiversityindexdecreased.Withstanddensitydecreases,theherblayerbio-m
8、assincreasedgradually,shrublayerbiomassincreasedandslightlyreduced.Thebiomassofshrubswasmaximumwhenstanddensitywas1000—1200individualsperhectare.ForBeijinglowhillshadeslopePinustabulaeformisplantation(40years
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