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1、太白山森林群落和林下草本物种变化的环境解释陈煜，许金石,张丽霞，郭连鑫,柴永福，王茂,张晨光，岳明*曲北大学生命科学学院，西安，710069摘要：。采用典范对应分析(CCA)、Pearson相关分析、冗余分析(RDA)分别研究了不同环境因子对太白山森林群落及林下草本物种纽•成、多样性、功能性状等方面的影响。结果衣明：1)9种环境因子对于群落及林卜-草本物种的组成变化的解释程度不高，分别为23.9%和21」％,但与海拔和止壤含水虽紧密相关的CCA1轴能大致区分高、中、低海拔样方的群落所有物种利草本植物的组成差异。2)沿海拔梯度，群落所有物种的a多样性先增加后降低。林下草木物种a多样性沿海
2、拔梯度有下降趋势。二者都与坡度(Slope)及木木层盖度(WCD)无关。3)海拔是决定森林群落及林下草本层物种功能性状值变化的主要因子，与海拔密切柑关的RDA1轴能解释森林群落和林下草本物种性状值变化的71.2%和54.7%淋下草本植物与群落的最大株高(Hn那)变化模式不一致。关键词林下草木，物种组成，多样性，功能性状，典范对应分析(CCA),兀余分析(RDA)EnvironmentalInterpretationofVariationsonForestCommunityandUnderstoryHerbaceousinTaibaiMountain,Shaanxi,ChinaCHENY
3、u,XUJinshi,ZHANGLixia,GUOYaoxin,CHAIYongfu,WANGMao,ZHANGChenguang,YUEMingCollegeofLifeSciences,NorthwestUniversity,Xi'an.710069,ChinaAbstract:Ourstudyaimedtodeterminetherelationshipbetweentheenvironmentfactorsandthesevariationpatterns.Also,weexaminedthedifferenceofvariationpatternsbetweenforestc
4、ommunityandunderstoryherblayeronly.Thecanonicalcorrespondenceanalysis(CCA)wasusedfortestingtherelationshipbetween9environmentfactorsandspeciescompositiondata.Acorrelationtestwasdeterminedtherelationshipbetweenenvironmentfactorsandspeciesadiversity.Redundancyanalysis(RDA)wasusedtoanalyzetheimport
5、aneeofenvironmentfactorsonplantftmctionaltraits.WealsotestedthePearsoncorrelationcoefficientofcommunityadiversityandfunctionaltraitsbetweenforestcommunityandunderstoryherblayer.Wefoundthat1)9environmentfactorshadapoorpowertoexplainthechangeofbothforestcommunityandunderstoryherblaye匚However，theax
6、is1ofCCAcoulddistinguishthealtituderangeofeachplotinbothmode.2)Alongtheelevation,theSharrnon-WienerindexofforestcommunityatfirstincreasedandthendecreasedwhiletheShannon-Wienerindexofunderstoryherblayerdecreasedmonotonously.3)TheShannon-Wienerindexofbothcommunityandherblayerwasindependencetoslope
7、andWoodyspecieslayercoverdcgrcc(WCD).Thcaxis1ofRDAwhichrelatedtoaltitudecouldexplain71.2%oftotaltraitvariationforforestcommunityand54.7%forunderstoryherblayer.Thevariationpatternofplantmaxheightvalue(Hmax)offorestcommunityan
