早期植物有机物通过增强的花增加了全球陆地泥沉积
Sarah S Zeichner1, Justin Nghiem2, Michael P Lamb2
1Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA. szeichner@caltech.edu.
概括
在奥尔多维纪-西卢纪期间,植物,而不是根深蒂固的植物,很可能造成了广泛的泥洪水平原. 植物有机物促进了粘土聚集和沉积在河流中,导致景观变化.
科学领域:
- 地质学
- 古植物学
- 环境科学
背景情况:
- 在奥尔多维纪-西卢纪时期,岩岩石的数量显著增加.
- 一个普遍的理论认为这种转变是源于根深蒂固的植物的进化.
研究的目的:
- 调查植物在泥泛滥平原中的作用.
- 测试假设增加的初级生产和植物有机物促进了粘土花和泥沉积.
主要方法:
- 实验室实验模拟不同的有机和粘土度的河流条件.
- 使用沉积物运输模型来评估积对泥沉积的影响.
主要成果:
- 在有机物质的存在下,在现代河流中发现的度下,粘土很容易形成.
- 与非有机条件相比,积使粘土沉速度增加了三倍.
- 一个运输模型表明,花显著增加了泥沉积,导致更泥的洪水平原.
结论:
- 由植物等早期植物驱动的有机诱导的花在泥泛滥平原的形成中发挥了关键作用.
- 这种机制在塑造这些景观方面可能比根深蒂固的植物更有影响力.
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