Implications of Free and Occluded Fine Colloids for Organic Matter Preservation in Arable Soils

Colloidal organo–mineral associations contribute to soil organic matter (OM) preservation and mainly occur in two forms: (i) as water-dispersible colloids that are potentially mobile (free colloids) and (ii) as building units of soil microaggregates that are occluded inside them (occluded colloids)....

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Published in:Environmental science & technology Vol. 56; no. 19; pp. 14133 - 14145
Main Authors: Tang, Ni, Siebers, Nina, Leinweber, Peter, Eckhardt, Kai-Uwe, Dultz, Stefan, Nischwitz, Volker, Klumpp, Erwin
Format: Journal Article
Language:English
Published: Easton American Chemical Society 04-10-2022
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Abstract Colloidal organo–mineral associations contribute to soil organic matter (OM) preservation and mainly occur in two forms: (i) as water-dispersible colloids that are potentially mobile (free colloids) and (ii) as building units of soil microaggregates that are occluded inside them (occluded colloids). However, the way in which these two colloidal forms differ in terms of textural characteristics and chemical composition, together with the nature of their associated OM, remains unknown. To fill these knowledge gaps, free and occluded fine colloids <220 nm were isolated from arable soils with comparable organic carbon (Corg) but different clay contents. Free colloids were dispersed in water suspensions during wet-sieving, while occluded colloids were released from water-stable aggregates by sonication. The asymmetric flow field-flow fractionation analysis on the free and occluded colloids suggested that most of the 0.6–220 nm fine colloidal Corg was present in size fractions that showed high abundances of Si, Al, and Fe. The pyrolysis-field ionization mass spectrometry revealed that the free colloids were relatively rich in less decomposed plant-derived OM (i.e., lipids, suberin, and free fatty acids), whereas the occluded colloids generally contained more decomposed and microbial-derived OM (i.e., carbohydrates and amides). In addition, a higher thermal stability of OM in occluded colloids pointed to a higher resistance to further degradation and mineralization of OM in occluded colloids than that in free colloids. This study provides new insights into the characteristics of subsized fractions of fine colloidal organo–mineral associations in soils and explores the impacts of free versus occluded colloidal forms on the composition and stability of colloid-associated OM.
AbstractList Colloidal organo–mineral associations contribute to soil organic matter (OM) preservation and mainly occur in two forms: (i) as water-dispersible colloids that are potentially mobile (free colloids) and (ii) as building units of soil microaggregates that are occluded inside them (occluded colloids). However, the way in which these two colloidal forms differ in terms of textural characteristics and chemical composition, together with the nature of their associated OM, remains unknown. To fill these knowledge gaps, free and occluded fine colloids <220 nm were isolated from arable soils with comparable organic carbon (Corg) but different clay contents. Free colloids were dispersed in water suspensions during wet-sieving, while occluded colloids were released from water-stable aggregates by sonication. The asymmetric flow field-flow fractionation analysis on the free and occluded colloids suggested that most of the 0.6–220 nm fine colloidal Corg was present in size fractions that showed high abundances of Si, Al, and Fe. The pyrolysis-field ionization mass spectrometry revealed that the free colloids were relatively rich in less decomposed plant-derived OM (i.e., lipids, suberin, and free fatty acids), whereas the occluded colloids generally contained more decomposed and microbial-derived OM (i.e., carbohydrates and amides). In addition, a higher thermal stability of OM in occluded colloids pointed to a higher resistance to further degradation and mineralization of OM in occluded colloids than that in free colloids. This study provides new insights into the characteristics of subsized fractions of fine colloidal organo–mineral associations in soils and explores the impacts of free versus occluded colloidal forms on the composition and stability of colloid-associated OM.
Author Klumpp, Erwin
Tang, Ni
Eckhardt, Kai-Uwe
Nischwitz, Volker
Dultz, Stefan
Siebers, Nina
Leinweber, Peter
AuthorAffiliation Wilhelm-Johnen-Straße
Institute of Bio- and Geosciences, Agrosphere (IBG-3), Forschungszentrum Jülich GmbH
Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C), Forschungszentrum Jülich GmbH
University of Rostock
Department of Life, Light, and Matter (LLM)
Soil Science, Faculty of Agricultural and Environmental Sciences
Institute of Soil Science, Leibniz Universität Hannover
Institute for Environmental Research, Biology 5
RWTH Aachen University
Central Institute for Engineering, Electronics and Analytics, Analytics (ZEA-3), Forschungszentrum Jülich GmbH
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Snippet Colloidal organo–mineral associations contribute to soil organic matter (OM) preservation and mainly occur in two forms: (i) as water-dispersible colloids that...
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SubjectTerms Aluminum
Amides
Arable land
Biogeochemical Cycling
Carbohydrates
Chemical composition
Clay minerals
Colloids
Decomposition
Dispersion
Fatty acids
Field ionization
Fractionation
Fractions
Ionization
Iron
Lipids
Mass spectrometry
Mass spectroscopy
Microorganisms
Mineralization
Organic carbon
Organic matter
Organic soils
Plants
Preservation
Pyrolysis
Silicon
Soil organic matter
Soils
Sonication
Thermal stability
Title Implications of Free and Occluded Fine Colloids for Organic Matter Preservation in Arable Soils
URI http://dx.doi.org/10.1021/acs.est.2c01973
https://www.proquest.com/docview/2722386631
https://search.proquest.com/docview/2715442395
Volume 56
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