La evolución de las paleofloras en las cuencas cenozoicas catalanas
La evolución de las paleofloras en las cuencas cenozoicas catalanas
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加泰罗尼亚新生代古植物的进化
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
A. S. D. S. Catalán
中科院分区：
文献类型：
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作者：
A. S. D. S. Catalán
本文研究了加泰罗尼亚新生代盆地植物区系的演化，主要涉及加泰罗尼亚不同地区的大型植物区系。沿着新生代，该地区的植物区系在古近纪时变为热带，在上新世末变为温带。三个明确界定的时期提供了丰富多样的植物群：a）早渐新世（Sarral和Cervera地区）。B）上中新世（La Cerdanya盆地）。c）上新世早期（Baix Llobregat盆地）。根据这一化石植物群，在新生代，该地区的气候从热带（古近纪）到上新世末的温带，经历了其他中间气候。始新世的植物群的主要特征是存在红树林，其中有Nipadites和Acrostichum等物种。渐新世的植物群呈现出丰富多样的植被，有一百多个化石forms。研究结果表明，该群落基本群落结构类似于樟子松林，以樟科和栎属植物为主，形成一种“万年青硬叶-月桂叶林”。气候有利于这种植被的发展，由于在山坡上形成的云量，显示出高度和相当恒定的hernidity。与laurisilva共存存在于较低的地形水平的特征旱生群落。早中新世和中中新世为亚热带或热带干旱型气候。苏木科和含羞草科与其他旱生植物成分一起出现频率较高。晚中新世，温暖的热带或亚热带植物群大量消失，新植被主要由温带物种组成。高湿度是早期托顿的特征，反映在林地环境中。沿着上新世，剩下的温暖类群消失了。上新世早期，气候炎热，地中海种类增多。上新世-更新世气候温和湿润，植物区系以特有种为主。
This paper studies the evolution of the floras in the Catalan Cenozoic basins dealing mainly with the macroflora found in diverse localities of Catalonia. Along the Cenozoic the floras in the region became tropical in the Paleogene and temperate at the end of the Pliocene. Three clearly defined periods offer rich and varied flora: a) Early Oligocene (Sarral and Cervera Localities). b) Upper Miocene (La Cerdanya basin). c) Early Pliocene (Baix Llobregat basin). According to this fossil flora, during the Cenozoic the climate in the area turns from tropical (in the Paleogene) to temperate at the end of the Pliocene, going through other intermediate climates. The main characteristic of the flora in the Eocene is the presence of a mangrove with Nipadites and Acrostichum, among other species. The Oligocene flora presents a rich and varied vegetahon with more than a hundred fossil forns. The study of this macroflora reveals that the basic community was like the laurisilva, with dominant presence of Lauraceae and Quercus originating an variety of "Evergreen sclerophyllous-laurophyllous forest". The climates favouring the development of this vegetation, displayed high and quite constant hurnidity because of the formation of cloudiness in the mountains slopes. Coexisting with the laurisilva existed in lower topographic levels a characteristic xerophitic community. In the Lower and Middle Miocene thte climate was subtropical or tropical dry type. The Caesalpiniaceae and Mimosaceae are frequent together with other xerophytic elements. In the Late Miocene the warm tropical or subtropical flora disappeaued largely and the new vegetation is composed by mostly temperate species. A high humidity characterizes the Early Tortonian, reflected by woodland environment. Along the Pliocene the remaining warm taxa disappeared. The Early Pliocene is characterized by a hot and hurnide climate, the nediterranean species become more frequent. The Plio-Pleistocene is characterized by a temperate and humide climate and their macroflora is especially composed by actual species.