Colhoun Eric A, VAN DE Geer Guus, Hill Robert S, Bird Trevor
Department of Geography, University of Newcastle, NSW, 2308, Australia.
Department of Geography, University of Tasmania, Box 252C, Hobart, Tas, 7001, Australia.
New Phytol. 1989 Mar;111(3):531-548. doi: 10.1111/j.1469-8137.1989.tb00716.x.
Pollen and plant macrofossils from Langdon liner give an interglacial floral record for western Tasmania. The location of the site between the ice limits of the Last or Margaret Glaciation and the Penultimate or Henty Glaciation indicate that it cannot be younger than the Last Interglacial. The sequence of vegetation changes shows the succession Casuarina Phyllocladus-Nothofagus with Casuarina as pioneer and Nothofagus as representing Maximum wet forest development. After the maximum the presence of Phyllocladus-Nothofagus-Eucalyptus-Microstrobos suggests deterioration to subalpine woodland/shrubland, and Compositae, Gramineae-Microstrobos to alpine shrubland and herbland. The sequence represents most of a glacial-interglacial-glacial cycle Of environmental changes that occurred before 43 000 C yr B.P. Very high Casuarina values occur in the early part at the interglacial sequence which contrasts with the Holocene where Eucalyptus is more important than Casuarina. Otherwise the sequence of Phyllocladus, Nothofagus, Eucryphia-Anodopetalum is the same as for Holocene forest development. The interglaeial 'optimum' is marked by the occurrence of Pomaderris apetala type and Dicksonia antarctica. There is some similarity with the Casuarina curves in the Lake George interglacials before the Last Interglacial. But, on the whole, there is more similarity with interglacial rainforest development in western South Island, New Zealand Only one cycle of vegetation change is recognized at Langdon River which is unlike New Zealand and central Chilean records from 40-42° S which in different ways record a mid Last Interglacial climatic deterioration.
来自兰登班轮的花粉和植物大化石提供了塔斯马尼亚西部的一个间冰期植物记录。该地点位于末次或玛格丽特冰期与倒数第二次或亨蒂冰期的冰界之间，这表明它不可能比末次间冰期更年轻。植被变化序列显示了以木麻黄为先锋、假山毛榉代表最大湿润森林发育阶段的木麻黄 - 假山毛榉演替。在达到最大值之后，假山毛榉 - 桉属 - 微果松的出现表明向亚高山林地/灌丛地退化，而菊科、禾本科 - 微果松的出现则表明向高山灌丛地和草本植物群落退化。该序列代表了距今43000碳年之前发生的大部分冰期 - 间冰期 - 冰期环境变化周期。在间冰期序列的早期出现了非常高的木麻黄值，这与全新世形成对比，在全新世桉属比木麻黄更重要。否则，假山毛榉、桉属、假山毛榉科 - 无瓣花属的序列与全新世森林发育相同。间冰期的“最佳状态”以无瓣石斑木类型和南极树蕨的出现为标志。它与末次间冰期之前乔治湖间冰期的木麻黄曲线有一些相似之处。但是，总体而言，它与新西兰南岛西部的间冰期雨林发育更相似。在兰登河只识别出一个植被变化周期，这与新西兰和南纬40 - 42°的智利中部记录不同，后者以不同方式记录了末次间冰期中段的气候恶化。
