气候变化领域集成服务门户(CCPortal): Bioturbation feedbacks on the phosphorus cycle

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DOI	10.1016/j.epsl.2021.116961
	Bioturbation feedbacks on the phosphorus cycle
	Tarhan L.G.; Zhao M.; Planavsky N.J.
发表日期	2021
ISSN	0012821X
卷号	566
英文摘要	Bioturbation—sediment mixing and ventilation by burrowing animals—provides one of the most prominent examples of how animals shape their surroundings. A critical but longstanding question is when and how in Earth's history bioturbators began to similarly influence marine biogeochemistry. Recent work has proposed that even though the development of well-mixed sediments was a protracted process, the initial rise of bioturbators led to a decrease in marine phosphate levels, global productivity crises and ultimately deoxygenation events in the early Cambrian oceans. Herein, using a diagenetic model, we provide a new view of how bioturbators impact the global phosphorus cycle. Our work focuses on incorporating more realistic representation of bioturbation with a more complete and mechanistic parameterization of benthic phosphorus cycling than has previously been used to explore the early Paleozoic. We find, in contrast to previous modeling studies, that bioturbation does not uniformly or unidirectionally mediate increased phosphorus burial. Enhanced biodiffusion of sedimentary particles can mediate enhanced phosphorus burial. In contrast, bioirrigation—nonlocal transport of solutes via burrows—enhances phosphorus recycling and may therefore stimulate rather than stymy productivity. Given evidence from the geologic record that bioirrigation rather than biodiffusion was predominant during the ramping up of bioturbation (through the early Paleozoic), the emergence of bioturbation is unlikely to have driven deoxygenation events. © 2021 Elsevier B.V.
关键词	biogeochemistry bioturbation diagenesis early Paleozoic phosphorus
英文关键词	Animals; Biogeochemistry; Productivity; Sedimentology; Bio-irrigation; Bioturbation; Deoxygenations; Early cambrians; Early Paleozoic; Marine biogeochemistries; Mixed sediments; Phosphate levels; Phosphorus cycles; Productivity crisis; Phosphorus; bioturbation; diagenesis; geological record; paleoenvironment; Paleozoic; phosphorus
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203305
作者单位	Department of Earth and Planetary Sciences, Yale University, New Haven, CT 06511, United States; School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom
推荐引用方式 GB/T 7714	Tarhan L.G.,Zhao M.,Planavsky N.J.. Bioturbation feedbacks on the phosphorus cycle[J],2021,566.
APA	Tarhan L.G.,Zhao M.,&Planavsky N.J..(2021).Bioturbation feedbacks on the phosphorus cycle.Earth and Planetary Science Letters,566.
MLA	Tarhan L.G.,et al."Bioturbation feedbacks on the phosphorus cycle".Earth and Planetary Science Letters 566(2021).