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《小兴安岭阔叶红松林粗木质残体基础特征.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、第46卷第4期林业科学Vol.46,No.42010年4月SCIENTIASILVAESINICAEApr.,2010*小兴安岭阔叶红松林粗木质残体基础特征刘妍妍金光泽(东北林业大学林学院哈尔滨150040)2摘要:以小兴安岭典型阔叶红松林大面积固定样地(9hm)为对象,分析粗木质残体(CWD)的物种组成及数2量特征、径级结构、存在形式、腐烂等级,揭示小兴安岭阔叶红松林CWD的基础特征。结果表明:9hm典型阔叶红松林固定样地内共计有胸径≥2cm的CWD3418株(由于高度腐烂鉴别不出种的CWD有864株,占总个体数的-22-23
2、-225.3%),CWD的密度、胸高断面积和体积分别为380株·hm、15.80m·hm和90.1m·hm;花楷槭和枫桦是2-2阔叶CWD的主要组成树种,红松和冷杉是针叶CWD的主要组成树种;针叶树种的胸高断面积(9.12m·hm)和3-2体积(57.68m·hm)分别达到总体CWD的57.7%和64%;在各存在形式下不同种的CWD数量随着径级的增加而减少,均呈反J型;除未知种以外,其他CWD都主要以枯立木、干基折断和干中折断形式存在;针叶树种根桩形式CWD的数量随着径级的增加而增加,这一规律有别于其他种;样地内各树种CWD腐烂
3、等级都大致呈正态分布,主要集中在Ⅱ和Ⅲ腐烂等级上;除针叶树种的Ⅴ腐烂等级外,各树种不同腐烂等级CWD的数量都随着径级的增加呈减少的趋势。关键词:阔叶红松林;粗木质残体;存在形式;腐烂等级;小兴安岭中图分类号:Q148文献标识码:A文章编号:1001-7488(2010)04-0008-07CharacterofCoarseWoodyDebrisinaMixedBroad-LeavedKoreanPineForestinXiaoxing’anMountains,ChinaLiuYanyanJinGuangze(ForestryCo
4、llegeofNortheastForestryUniversityHarbin150040)Abstract:Thespeciescomposition,DBH(diameteratbreastheight)class,existingform,decayclassofcoarsewoody2debris(CWD)werestudiedinalargepermanentplot(9hm)ofatypicalmixedbroad-leavedkoreanpineforestinXiaoxing’anMountains.AllCW
5、DswithDBH≥2cmweretagged,mapped,measured(girth)withspeciesidentified.2Importantfindings:atotalof3418CWDindividualswithDBH≥2cmwererecordedinthe9hmplotamongwhichthespeciesof864CWDindividualswerenotabletobeidentifiedduetoseriousdecay,accountedfor25.3%ofthetotal-22-2sampl
6、esrecorded.TheCWDdensity,basalareaandvolumewere380indivadual·hm,15.80m·hmand90.13-2m·hm,respectively.AcerukurunduenseandBetulacostatawerethemajorbroad-leavedtreespecieswhilePinus2-2koraiensisandAbiesnephrolepiswerethemajorconiferoustreespecies.Thebasalarea(9.12m·hm)a
7、ndvolume3-2(57.68m·hm)ofCWDsfromconiferoustreespeciesaccountedfor57.7%and64%ofthetotalbasalareaandvolume,respectively.ThedensityofdifferenttypesofCWDsdecreasedasincreaseofDBHclass,andfollowedtheinverseJ-shape.TheCWDexistingformswasmainlycomposedofstandingdie,breakage
8、atrootstockandbreakageattrunk.DensityofconiferstumpCWDsincreasedwiththeDBHclass.ThedecayclassesofCWDfollowednormaldistributionwitha
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