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1、重庆三峡库区消落带优势植物种群空间分布格局研究齐代华*,贺丽,周旭,闵鹏三峡库区生态环境教育部重点实验室,重庆市三峡库区植物生态与资源重点实验室,西南大学生命科学学院,重庆北碚400715摘要:重庆三峡库区消落带是中国乃至世界最为特殊的生态功能区,对该区植物空间分布格局的研究,对于合理利用消落带湿地生物多样性,维持生态系统平衡,实现区域可持续发展起重要作用。根据野外调查数据,应用方差均值比(ID),聚集度大小指数(ICS),Green指数(GI),聚集频度指数(ICF),平均拥挤度指数(1MC),聚块度指数(IP),莫里西塔指数(IM)等7项指数
2、,研究分析了重庆三峡库区消落带四个海拔区段的优势植物种群空间分布格局。结果表明:优势种群的分布格局皆属于聚集分布,但聚集强度有差异,这与物种的生物学特性有关。在每个海拔区段中,聚集强度最大的都是狗牙根种群,其他物种的分布规律不明显。在不同区段中,同一种群的聚集强度也存在差异,群落分布格局不仅受优势种的影响,还受环境因子制约。空间分布格局的各个指数是从不同的角度衡量某一种群的分布型,彼此指数之间存在一定的相关性。关键词:三峡库区;消落带;优势种群;空间分布格局ThreeGorgesReservoir;water-level-fluctuatingz
3、oneAnalysisofspatialdistributionpatternfordominantplantpopulationsintheriparianofThreeGorgesReservoirRegion,ChongqingQIDai-hua,HELi,ZHOUXu,MINPenKeylaboratoryofEco-environmentintheThreeGorgesReservoirRegion,MinisitryofEducation,ChongqingKeyLaboratoryofPlantEcologyandResources
4、ResearchinThreeGorgesReservoirRegion,FacultyofLifeSciences,SouthwestUniversity,Beibei400715,Chongqing,ChinaAbstract:Chongqing Three Gorges Reservoir is the most special ecological function zones riparianin China and the worldthe research of spatial distribution pattern of pla
5、nts in this area plays an important role on reasonably use of reservoir wetland biodiversity, maintaining ecosystem balance, and realizing regional sustainable development.Basedonthedatafromthefield,dispersion(ID)index,clustersize(ICS)index,Greenindex(GI)index,clusterfrequ
6、ency(ICF)index,meancrowding(IMC)index,patchiness(IP)indexandMoristialindex(IM)wereusedtoanalysethespatialdistributionpatternofdominantplantpopulationoffouraltitudesectionsintheriparianofThreeGorgesReservoirRegioninChongqing.Resultsshowedthat:thepatternsofthosedominantpopulati
7、onswereallclumped,thebiologicalcharacteristicsofspecieswasanimportantfactorbecausethereweresignificantdifferenceinclumpintensity.Ineachsection,thelargestaggregationintensitywasrotunduspopulations,therewerenoobviousruleofotherspeciesaggregativeintensity.Indifferentsections,dif
8、ferentaggregationintensityofthesamespecieswasnotonlyrelatedtothebiol