生态学报2017，Vol.37Issue(2)：523-540,18.DOI:10.5846/stxb201507111469
温州沿海小型海岛植物丰富度和β多样性及其影响因子
Factors affecting species richness and beta diversity of vascular plants on small islands in the Wenzhou region of eastern China
摘要
Abstract
We conducted field surveys on 20 small,uninhabited islands off the coast of Wenzhou in the Pacific Ocean and recorded 366 vascular plants belonging to 244 genera and 96 families.Of these,140 were woody and 226 were herbaceous species.Five regression models were constructed to predict species richness (S) andβ diversity and the final models were selected based on the Akaike information criterion (AIC).The effects of island size (A),distance to the mainland (Im),inter-island distance (Ii),shoreline length (Per),perimeter to area ratio (PAR),elevation (E),habitat types (Hn),habitat diversity (Hd),and island shape index (SI) were examined.Model SAHn R had the highest Akaike weight,40.26％,with a ratio of 1.19,2.17,5.80,and 94.08 over SAR,SAHdR,BR-SAR1,and BR-SAR2,respectively.Species richness increased with island size following the classic species-area relationship.However,the species similarity index decreased with increasing Ii.The importance of all exploratory variables onβ diversity was Im =0.61,Ii =0.56,PAR =0.49,A =0.20,Pct =0.14,Hn =0.072,E =0.065,and SI=0.05,suggesting that isolation (i.e.,Im and Ii) played a major role inβ diversity.Plant species richness was also significantly affected by PAR and Hd.Stepwise regression showed that the best models to predict S were:S =76.714 + 1.696A-0.046PAR (R2=0.839),S-woody =6.525+ 0.455A+ 24.544Hd(R2=0.697),and S-herbaceous =66.899+ 1.285A-0.04PAR-23.434Hd (R2 =0.865) for total,woody,and herbaceous species richness,respectively.This further indicated that species richness of different growth forms (i.e.,woody and herbaceous) on these islands was not solely dependent on island size.关键词
岛屿生物地理学/物种丰富度/种-面积关系/空间特征/小岛屿效应Key words
island biogeography/species richness/species-area relationship/spatial characteristics/small island effect引用本文复制引用
王金旺,魏馨,陈秋夏,李效文,杨升..温州沿海小型海岛植物丰富度和β多样性及其影响因子[J].生态学报,2017,37(2):523-540,18.基金项目
浙江省财政厅预算内资金资助项目(335010-2015-0005) （335010-2015-0005）
温州市财政科技专项资助项目(温财农[2010]218号) （温财农[2010]218号）
温州市海洋与渔业局科研资金(温州市重点无居民海岛植物资源调查研究) （温州市重点无居民海岛植物资源调查研究）
国家海洋局温州海洋监测站(海岛植被监测和植物资源调查项目) （海岛植被监测和植物资源调查项目）
