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首页> 外文期刊>Journal of Botany >A Phytogeographical Classification of the North American Pacific Coast Based on Climate, Vegetation and a Floristic Analysis of Vascular Plants
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A Phytogeographical Classification of the North American Pacific Coast Based on Climate, Vegetation and a Floristic Analysis of Vascular Plants

机译：基于气候，植被和维管植物的植物区系分析的北美太平洋海岸植物地理分类

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This study was designed to explore floristic variation along the Pacific coast from Cook Inlet, Alaska, to the southern tip of Baja California, Mexico. Data corresponding to 965phytosociological relevés (including 686 vascular plants) obtained by sampling 279 coastal siteswere examined. Using an objective classification system (Average Linkage Clustering), floristicdata acquired in fieldwork were related to the macroclimates of the study area. The registered taxawere grouped into phytogeographical elements, giving rise to a phytogeographical classification inwhich eight floristic provinces were distinguished. Floristic differences among provinces werecorrelated with palaeoclimatic and palaeogeographical events. The boreal and temperate provincesshow high percentages of broadly distributed elements, whose origins can be found in theBoreotropical or Arcto-Tertiary geoflora that dominated the Northern Hemisphere during theTertiary. The floristically richest provinces are the three that occupy the Mediterranean zone, sincethese provinces harbour elements of Arcto-Tertiary and Madro-Tertiary geofloras. The flora oftropical Baja California is characterised by a high number of taxa related to Neotropical flora,especially to those showing links with South America.
机译：这项研究旨在探索从阿拉斯加的库克湾（Cook Inlet）到墨西哥下加利福尼亚州（Baja California）南端的太平洋沿岸植物区系。通过对279个沿海地区进行采样，获得了与965个植物社会学相关信息（包括686种维管植物）相对应的数据。使用客观分类系统（平均链接聚类），在野外工作中获得的植物数据与研究区域的宏观气候有关。已注册的紫杉分类为植物地理要素，从而形成了一个植物地理分类，其中区分了八个植物区系。各省之间的植物区系差异与古气候和古地理事件有关。北方和温带的省份分布广泛的元素占很高的比例，其起源可以在第三纪期间支配北半球的北冰洋或第三纪第三纪地层中找到。植物区系最丰富的省份是占领地中海地区的三个省份，因为这些省份拥有Arcto-Tertiary和Madro-Tertiary地理植物区系。热带下加利福尼亚州的植物群的特点是与新热带植物群有关的类群数量众多，尤其是那些与南美洲有联系的植物群。

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