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Density fractions versus size separates: does physical fractionation isolate functional soil compartments?

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https://ir.library.oregonstate.edu/concern/articles/z029p540v

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Abstract
  • Physical fractionation is a widely used methodology to study soil organic matter (SOM) dynamics, but concerns have been raised that the available fractionation methods do not well describe functional SOM pools. In this study we explore whether physical fractionation techniques isolate soil compartments in a meaningful and functionally relevant way for the investigation of litter-derived nitrogen dynamics at the decadal timescale. We do so by performing aggregate density fractionation (ADF) and particle size-density fractionation (PSDF) on mineral soil samples from two European beech forests a decade after application of ¹⁵N labelled litter. Both density and size-based fractionation methods suggested that litter-derived nitrogen became increasingly associated with the mineral phase as decomposition progressed, within aggregates and onto mineral surfaces. However, scientists investigating specific aspects of litter-derived nitrogen dynamics are pointed towards ADF when adsorption and aggregation processes are of interest, whereas PSDF is the superior tool to research the fate of particulate organic matter (POM). Some methodological caveats were observed mainly for the PSDF procedure, the most important one being that fine fractions isolated after sonication can not be linked to any defined decomposition pathway or protective mechanism. This also implies that historical assumptions about the "adsorbed" state of carbon associated with fine fractions need to be re-evaluated. Finally, this work demonstrates that establishing a comprehensive picture of whole soil OM dynamics requires a combination of both methodologies and we offer a suggestion for an efficient combination of the density and size-based approaches.
  • This is the publisher’s final pdf. The published article is copyrighted by European Geosciences Union and can be found at: http://www.egu.eu/. It is published by Copernicus Publications and can be found at: http://publications.copernicus.org/.
  • Keywords: Mineral complexes, Organomineral complexes, Chemical characterization, Organic matter dynamics, N-15 labeled litter, Land use, Structural stability, Carbon stabilization, Natural C-13 abundance, Ultrasonic dispersion
  • Keywords: Mineral complexes, Organomineral complexes, Chemical characterization, Organic matter dynamics, N-15 labeled litter, Land use, Structural stability, Carbon stabilization, Natural C-13 abundance, Ultrasonic dispersion
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  • C. Moni, D. Derrien, P.-J. Hatton, B. Zeller, & M. Kleber. (2012). Density fractions versus size separates: Does physical fractionation isolate functional soil compartments? Biogeosciences, 9(12), 5181-5197.
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  • 9
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  • 12
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  • This work was financially supported by the Department of Crop and Soil Science, Oregon State University start-up funds to M. K. and by the Institut National de la Recherche Agronomique (INRA-EFPA) and the Region Lorraine (Grant 12000162A).
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file details MoniCCropSoilScienceDensityFractionsVersus.pdf 2017-07-10 公开 下载