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ID:5375019
大小:1.03 MB
页数:5页
时间:2017-12-08
《广西灌阳县天然阔叶混交林林分空间结构动态分析》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、安徽农业科学,JoumalofAnhuiAgri.Sci.2013,41(25):10328—10332责任编辑高菲责任校对卢瑶广西灌阳县天然阔叶混交林林分空间结构动态分析郑勇,温小荣(南京林业大学森林资源与环境学院,江苏南京210037)摘要该研究以灌阳县天然阔叶混交林为研究对象,通过对灌阳县天然阔叶混交林2005年和2010年2期森林清查数据对比,结合混交度、角尺度、大小比数这3个林分空间结构参数来说明5年期间该地天然阔叶混交林林分结构的变化及特点。分析发现,该地天然阔叶混交林混交度指数呈增大趋势,2期数据林分混交度值波动明显,总体上由弱度混交向中度混交转变。角尺度参数变化较稳
2、定,林木空间分布多为团状分布状态,随林龄增大,其平均角尺度多有降低趋势,林分结构有向随机分布演变的趋势。该地林分在胸径生长大小上的分布状态均为中庸状态,各样地大小比数值波动不大,荷木在胸径生长大小上占据较大优势,主要分布的栎类2010年在胸径生长上的优势有所增加,也均处在中庸分布。总体来说,灌阳县天然阔叶混交林林分有向稳定森林群落发展的趋势,其空间结构还有待进一步优化。、关键词灌阳县;天然阔叶混交林;动态;空间结构中图分类号$757文献标识码A文章编号o517—6611(2013)25—10328—05DynamicAnalysisofStandSpatialStructureof
3、aNaturalBroad-leavedMixedForestinGuanyangCounty,GuangxiProvinceZHENGYongetal(CollegeofForestResourcesandEnvironment,NanjingForestryUniversity,Nanjing,Jiangsu210037)AbstractTakingthenaturalbroad—leavedmixedforestsinGuanyangCountyastheobjectofresearch。throughcomparisonresearchonthesurveydataofna
4、turalbroad.1eavedmixedforestin2005and2010.combinedwiththreestandspatialstructureparameters.suchastheming—lingintensity(M),uniformangleindex(W)andneighborhoodcomparison(U),thechangesandcharacteristicsofthestandstructureduringthefiveyearswaselaborated.Itwasfoundthatthemixedindexshowedatrendofinc
5、reasingandtwophasedataofmixeddegreefluctuatedob.viously.Onthewhole.thechangewasfromtheweakdegreetomoderate.Theangleindexchangedverylittle,andthepatternofindividualtreehorizontaldistributionwasmuchasclusterdistribution.withtheincreaseofforestage。theaverageoftheangleindexgotdown,therewasatrendof
6、theforeststandstructuretorandomdistribution.ThesituationoftheDBHsizeofthenaturalbroad—leavedmixedforestsismostinmediumstate.ThefluctuationofneighborhoodcomparisonofallplotsiSgende.GrowthofSchimasuperbaDBHiSanadvantageobviously.theDBHgrowthadvantageofthemainlydistributedQuercusLincreasedin2010.
7、alsoallinmediumstate.Ingenera1.thenaturalbroad—leavedmixedforestinGuanyangCountyhasadevelopmenttrendtostableforestcommunity.itsspatialstructureremainstobefurtheroptimized.KeywordsGuanyangCounty:Naturalbroad1eavedmixedforests}Dynamic;The
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