摘要
WeinvestigatedthecompositionofplantcommunitiestoquantifytheirrelationshipswithenvironmentalparametersintheChitralHindukushrangeofPakistan.WesampledtreevegetationusingthePointCenteredQuarter（PCQ）methodwhileunderstoryvegetationwassampledin1.5-mcircularquadrats.CedrusdeodaraisthenationalsymbolofPakistanandwasdominantinthesampledcommunities.Becauseenvironmentalvariablesdeterminevegetationtypes,weanalyzedandevaluatededaphicandtopographicfactors.DCA-Ordinationshowedthemajorgradientasanamalgamofelevation（p〈0.05）andslope（p〈0.01）asthetopographicfactorscorrelatedwithspeciesdistribution.SoilvariableswerethefactorsofenvironmentalsignificancealongDCAaxes.However,amongthesefactors,Mg2＋,K＋andN2＋contributednotmorethan0.054%0.20%and0.073%,respectively,tovariationalongthefirstordinationaxis.Weconcludethattheprincipalreasonforweakornocorrelationwithmanyedaphicvariableswastheanthropogenicdisturbanceofvegetation.Theunderstoryvegetationwascomposedofperennialherbsinmostcommunitiesandwasmostdenseunderthetreecanopy.Theunderstoryvegetationstronglyregulatestreeseedlinggrowthandregenerationpatterns.Werecommendfurtherstudyoftheunderstoryvegetationusingpermanentplotstoaiddevelopmentofforestregenerationstrategies.
出版日期
2013年02月12日（中国Betway体育网页登陆平台首次上网日期，不代表论文的发表时间）
