globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2213
论文题名:
Stabilization of the coupled oxygen and phosphorus cycles by the evolution of bioturbation
作者: Boyle R.A.; Dahl T.W.; Dale A.W.; Shields-Zhou G.A.; Zhu M.; Brasier M.D.; Canfield D.E.; Lenton T.M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期:9
起始页码: 671
结束页码: 676
语种: 英语
英文摘要: Animal burrowing and sediment-mixing (bioturbation) began during the run up to the Ediacaran/Cambrian boundary, initiating a transition between the stratified Precambrian and more well-mixed Phanerozoic sedimentary records, against the backdrop of a variable global oxygen reservoir probably smaller in size than present. Phosphorus is the long-term limiting nutrient for oxygen production via burial of organic carbon, and its retention (relative to carbon) within organic matter in marine sediments is enhanced by bioturbation. Here we explore the biogeochemical implications of a bioturbation-induced organic phosphorus sink in a simple model. We show that increased bioturbation robustly triggers a net decrease in the size of the global oxygen reservoir - the magnitude of which is contingent upon the prescribed difference in carbon to phosphorus ratios between bioturbated and laminated sediments. Bioturbation also reduces steady-state marine phosphate levels, but this effect is offset by the decline in iron-adsorbed phosphate burial that results from a decrease in oxygen concentrations. The introduction of oxygen-sensitive bioturbation to dynamical model runs is sufficient to trigger a negative feedback loop: the intensity of bioturbation is limited by the oxygen decrease it initially causes. The onset of this feedback is consistent with redox variations observed during the early Cambrian rise of bioturbation, leading us to suggest that bioturbation helped to regulate early oxygen and phosphorus cycles. © 2014 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106625
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Institute of Biology and Nordic Centre for Earth Evolution, University of Southern Denmark, Campusvej 55, 5230 Odense M, Odense, Denmark; Laver Building, College of Life and Environmental Sciences, University of Exeter, North Park Road, Exeter EX4 4QE, United Kingdom; Natural History Museum of Denmark, University of Copenhagen, Oslash;ster Voldgade 5-7, 1350 København K, Denmark; GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstrasse 1-3, 24148 Kiel, Germany; Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, United Kingdom; Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008, China; Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, United Kingdom

Recommended Citation:
Boyle R.A.,Dahl T.W.,Dale A.W.,et al. Stabilization of the coupled oxygen and phosphorus cycles by the evolution of bioturbation[J]. Nature Geoscience,2014-01-01,7(9)
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