Plants in movement – Floristic and climatic characterization of the New Jersey hinterland during the Palaeogene–Neogene transition in relation to major glaciation events
Plants in movement – Floristic and climatic characterization of the New Jersey hinterland during the Palaeogene–Neogene transition in relation to major glaciation events
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DOI：
10.5194/bg-2017-511
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发表时间：
2018-01
期刊：
影响因子：
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通讯作者：
Sabine Prader;U. Kotthoff;F. McCarthy;G. Schmiedl;T. Donders;D. Greenwood
中科院分区：
文献类型：
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作者：
Sabine Prader;U. Kotthoff;F. McCarthy;G. Schmiedl;T. Donders;D. Greenwood
抽象的。利用光学显微镜和扫描电子显微镜对新泽西腹地(北美东部：IODP-Expedition313)中渐新世至中新世早期陆生孢粉进行了分析，以推断全球气候变化背景下植被的垂直空间和长期时间迁移。腹地分布最广的植被类型是中生林，有栎属(Quercus)、栎科(Quercus/Lobatae)和栎科(aff.Protobalanus组)是优势分类单元。记录了已灭绝的壳斗科Eotrigonobalanus属的花粉粒。为了推断在选定的时间间隔内可能的地形古植被运动，将陆生孢粉形态划分为6个植被单元。植被单元的相对丰度在时间和空间上表现出较弱的波动，其中以双针形花粉的总和最为明显。植被单元的周期性变化表明，植物复盖物的运动响应于渐新世和早中新世的轨道尺度冰川-间冰期变化。几个分类群(如山核桃)的相对丰度在渐新世期间没有显著变化，但与同一地区已发表的中中新世晚期记录相比，变化是可以识别的，这可能表明生物对环境变化的反应。利用4个标准参数(年平均温度、最冷月平均温度、年平均降水量)进行了基于花粉的生物气候分析，以重建温度和降水波动较小的古气候变化。
Abstract. Mid-Oligocene to Early Miocene terrestrial palynomorphs from the New Jersey hinterland (eastern North America: IODP-Expedition 313) were analysed, using light microscopy and scanning electron microscopy, to infer altitudinal spatial and long-term temporal vegetation migration in context of global climate change. The mesophytic forest was the most widespread vegetation type in the hinterland, with Quercus (Group Quercus, Quercus/Lobatae and aff. Group Protobalanus) being the dominant taxon. Pollen grains of the extinct genus Eotrigonobalanus (Fagaceae) are documented. To infer possible topographic palaeovegetation movements during the selected time interval terrestrial palynomorphs were assigned to six vegetation units. Relative abundances of vegetation units show weak temporal and spatial fluctuations, with the sum of bisaccate pollen grains being most pronounced. Periodic changes in vegetation units suggest movements of the plant cover responding to orbital-scale glacial-interglacial changes of the Oligocene and early Miocene. Relative abundances of several taxa (e.g. Carya) did not change significantly during the Oligocene, but alterations are recognizable when compared with an already published late Middle Miocene record from the same area, probably indicating biotic responds to environment change. A pollen-based bioclimatic analysis with four standard parameters (mean annual temperature, mean temperatures of the coldest and warmest month, mean annual precipitation) was performed to reconstruct palaeoclimatic changes indicating weak fluctuations in temperature and precipitation.