Weak impact of microorganisms on Ca, Mg-bearing silicate weathering

Abstract Assessment of the microbial impact on mineral dissolution is crucial for a predictive understanding of basic (Ca, Mg bearing) silicate weathering and the associated CO2 consumption, bioerosion, and CO2 storage in basaltic rocks. However, there are controversies about the mechanism of microb...

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Autores principales:	Oleg S. Pokrovsky, Liudmila S. Shirokova, Svetlana A. Zabelina, Guntram Jordan, Pascale Bénézeth
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/b059974445f94a11a752c40e06eb5104
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spelling	oai:doaj.org-article:b059974445f94a11a752c40e06eb51042021-12-02T17:17:36ZWeak impact of microorganisms on Ca, Mg-bearing silicate weathering10.1038/s41529-021-00199-w2397-2106https://doaj.org/article/b059974445f94a11a752c40e06eb51042021-09-01T00:00:00Zhttps://doi.org/10.1038/s41529-021-00199-whttps://doaj.org/toc/2397-2106Abstract Assessment of the microbial impact on mineral dissolution is crucial for a predictive understanding of basic (Ca, Mg bearing) silicate weathering and the associated CO2 consumption, bioerosion, and CO2 storage in basaltic rocks. However, there are controversies about the mechanism of microbial effect, which ranges from inhibiting via nil to accelerating. Here we studied diopside interaction with the heterotrophic bacterium Pseudomonas reactants and the soil fungus Chaetomium brasiliense using a combination of mixed-flow and batch reactors and in situ (AFM) and ex situ (SEM) microscopy. The results provide new nano-level insights into the degree to which microorganisms modify silicate dissolution. Taking into account negligible effects of organic ligands on diopside dissolution as reported earlier, we conclude that the microbial effect on Ca-Mg silicates is weak and the acceleration of dissolution of “basic” silicate rocks in the presence of soil biota is solely due to pH decrease in porewaters.Oleg S. PokrovskyLiudmila S. ShirokovaSvetlana A. ZabelinaGuntram JordanPascale BénézethNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492ENnpj Materials Degradation, Vol 5, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Oleg S. Pokrovsky Liudmila S. Shirokova Svetlana A. Zabelina Guntram Jordan Pascale Bénézeth Weak impact of microorganisms on Ca, Mg-bearing silicate weathering
description	Abstract Assessment of the microbial impact on mineral dissolution is crucial for a predictive understanding of basic (Ca, Mg bearing) silicate weathering and the associated CO2 consumption, bioerosion, and CO2 storage in basaltic rocks. However, there are controversies about the mechanism of microbial effect, which ranges from inhibiting via nil to accelerating. Here we studied diopside interaction with the heterotrophic bacterium Pseudomonas reactants and the soil fungus Chaetomium brasiliense using a combination of mixed-flow and batch reactors and in situ (AFM) and ex situ (SEM) microscopy. The results provide new nano-level insights into the degree to which microorganisms modify silicate dissolution. Taking into account negligible effects of organic ligands on diopside dissolution as reported earlier, we conclude that the microbial effect on Ca-Mg silicates is weak and the acceleration of dissolution of “basic” silicate rocks in the presence of soil biota is solely due to pH decrease in porewaters.
format	article
author	Oleg S. Pokrovsky Liudmila S. Shirokova Svetlana A. Zabelina Guntram Jordan Pascale Bénézeth
author_facet	Oleg S. Pokrovsky Liudmila S. Shirokova Svetlana A. Zabelina Guntram Jordan Pascale Bénézeth
author_sort	Oleg S. Pokrovsky
title	Weak impact of microorganisms on Ca, Mg-bearing silicate weathering
title_short	Weak impact of microorganisms on Ca, Mg-bearing silicate weathering
title_full	Weak impact of microorganisms on Ca, Mg-bearing silicate weathering
title_fullStr	Weak impact of microorganisms on Ca, Mg-bearing silicate weathering
title_full_unstemmed	Weak impact of microorganisms on Ca, Mg-bearing silicate weathering
title_sort	weak impact of microorganisms on ca, mg-bearing silicate weathering
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/b059974445f94a11a752c40e06eb5104
work_keys_str_mv	AT olegspokrovsky weakimpactofmicroorganismsoncamgbearingsilicateweathering AT liudmilasshirokova weakimpactofmicroorganismsoncamgbearingsilicateweathering AT svetlanaazabelina weakimpactofmicroorganismsoncamgbearingsilicateweathering AT guntramjordan weakimpactofmicroorganismsoncamgbearingsilicateweathering AT pascalebenezeth weakimpactofmicroorganismsoncamgbearingsilicateweathering
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Weak impact of microorganisms on Ca, Mg-bearing silicate weathering

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