Paleoecology and paleoenvironments of Podocarp trees in the Ameghino Petrified forest (Golfo San Jorge Basin, Patagonia, Argentina): Constraints for Early Paleogene paleoclimate
Paleoecology and paleoenvironments of Podocarp trees in the Ameghino Petrified forest (Golfo San Jorge Basin, Patagonia, Argentina): Constraints for Early Paleogene paleoclimate
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DOI：
10.1344/105.000001647
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发表时间：
2011-05
期刊：
影响因子：
1.5
通讯作者：
M. Brea;S. Matheos;M. S. Raigemborn;A. Iglesias;A. F. Zucol;Mercedes B. Prámparo
中科院分区：
文献类型：
--
作者：
M. Brea;S. Matheos;M. S. Raigemborn;A. Iglesias;A. F. Zucol;Mercedes B. Prámparo
在古新世早期，巴塔哥尼亚中部的气候为暖温带，主要是万年青针叶林。在Ameghino石化林中发现了丰富的过矿化针叶树林沿着和一些双子叶植物和棕榈叶压缩，并提供了这种类型的植物群的证据。所有的矿化木材和大型树干恢复被分配到种Podocarpoxylon mazzonii。根据直径测量结果，估计树高为17- 29米。基于14个环序列，共169个环，平均环宽度和平均灵敏度（MS）分别为1.23和0.19mm。生长轮宽度适中，非常均匀和自满，表明环境是有利的和恒定的，没有明显的胁迫因素限制树木的生长。根据Falcon-Lang对针叶树的定量分析，对马尾松萝的年轮解剖表明，马尾松萝具有万年青习性。化石植物群、生长轮和沉积学分析的结合表明，这一万年青针叶林主要是在暖温带条件下发育的，没有限制因素。
During the Early Paleocene (Danian), Central Patagonia had a warm-temperate climate and was dominated by evergreen coniferous forests. Abundant permineralized conifer woods along with some dicot and palm leaf compressions were found in the Ameghino Petrified Forest, and provide evidence of this type of flora. All the permineralized wood and large trunks recovered were assigned to the species Podocarpoxylon mazzonii. An estimated tree height of 17-29m was calculated on the basis of diameter measurements. Based on 14 ring sequences, with a total of 169 rings, the mean ring width and Mean Sensitivity (MS) were 1.23 and 0.19mm respectively. The growth rings are moderately wide, extremely uniform and complacent, indicating that the environment was favourable and constant, and lacked significant stress factors limiting tree growth. Following the quantitative analysis for conifers outlined by Falcon-Lang, the growth ring anatomy of the Podocarpoxylon mazzonii suggests that these trees had an evergreen habit. The combination of the fossil flora, growth ring, and sedimentological analyses suggest that this mostly evergreen coniferous forest developed under warm-temperate conditions and without limiting factors.