Early plant organics increased global terrestrial mud deposition through enhanced flocculation

doi:10.1126/science.abd0379

GSTDTAP > 气候变化

DOI	10.1126/science.abd0379
	Early plant organics increased global terrestrial mud deposition through enhanced flocculation
	Sarah S. Zeichner; Justin Nghiem; Michael P. Lamb; Nina Takashima; Jan de Leeuw; Vamsi Ganti; Woodward W. Fischer
	2021-01-29
发表期刊	Science
出版年	2021
英文摘要	Rock such as slate and shale, which form from mud, suddenly start appearing in the geologic record around 450 million years ago. Their appearance at about the same time as certain plants seems to implicate plant roots in the formation of these ubiquitous rocks. Zeichner et al. found a different route for creating the flocculation required for mudrock. Using analog experiments, the authors found that organic matter from plants alone was sufficient for the formation of flocs—aggregates of small silt and clay particles—which are required to deposit mudrock. This observation could explain the appearance of these rocks in places where the plants did not have deep roots. Science , this issue p. [526][1] An irreversible increase in alluvial mudrock occurred with the Ordovician-Silurian evolution of bryophytes, challenging a paradigm that deep-rooted plants were responsible for this landscape shift. We tested the idea that increased primary production and plant organics promoted aggregation of clay into flocs in rivers and facilitated mud deposition on floodplains. In experiments, we observed that clay readily flocculated for organic and clay concentrations common to modern rivers, yielding settling velocities three orders of magnitude larger than those without organics. Using a transport model, we found that flocculation substantially increased mud deposition, resulting in muddier floodplains. Thus, organic-induced flocculation may have been more critical than deep-rooted plants in the proliferation of muddy floodplains. [1]: /lookup/doi/10.1126/science.abd0379
领域	气候变化 ; 资源环境
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/314020
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Sarah S. Zeichner,Justin Nghiem,Michael P. Lamb,et al. Early plant organics increased global terrestrial mud deposition through enhanced flocculation[J]. Science,2021.
APA	Sarah S. Zeichner.,Justin Nghiem.,Michael P. Lamb.,Nina Takashima.,Jan de Leeuw.,...&Woodward W. Fischer.(2021).Early plant organics increased global terrestrial mud deposition through enhanced flocculation.Science.
MLA	Sarah S. Zeichner,et al."Early plant organics increased global terrestrial mud deposition through enhanced flocculation".Science (2021).