Long-term release of carbon from grassland soil amended with different slurry particle size fractions: a laboratory incubation study

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Grilo, J., Bol, R., Dixon, E. R., Chadwick, D. R. and Fangueiro, D. 2011. Long-term release of carbon from grassland soil amended with different slurry particle size fractions: a laboratory incubation study. Rapid Communications in Mass Spectrometry. 25 (11), pp. 1514-1520. https://doi.org/10.1002/rcm.5008

AuthorsGrilo, J., Bol, R., Dixon, E. R., Chadwick, D. R. and Fangueiro, D.
Abstract

Application of animal manure to agricultural soils enhances both native soil carbon (C) and overall (native soil C and added C) respiration. CO2 effluxes were measured in a laboratory incubation study for 1465 days after the application of different slurry fractions (>2000, 425-2000, 250-425, 150-250, 45-150 and <45 mu m) to a grassland soil. The slurry-derived C present in the soil was traced using the natural abundance delta C-13 method. We used two kinetic (single and two pool) models to fit the experimental data and to test the model validity with respect to long-term data sets. Mean residence times (MRTs) of the particle size based slurry-C fractions were estimated using these models and a linear C-13 natural abundance based approach. The results showed that slurry-C degradation in soil over time varied between the different particle size based slurry treatments. The two kinetic soil-C models were successful to predict medium-to long-term carbon release from soil amended with animal slurry. The estimated MRTs did vary between the linear (3.8-5.6 years) and non-linear based (0.8-3.8 years) (model) approaches. Slurry-derived C could still be (isotopically) detected in the soil 4 years after slurry application using the natural abundance delta C-13 method. This suggests that it may take a decadal timescale or longer before the entire amount of C introduced through whole slurry amendments to grassland soils is fully dissipated. Copyright (C) 2011 John Wiley & Sons, Ltd.

KeywordsBiochemical Research Methods; Chemistry, Analytical; Spectroscopy
Year of Publication2011
JournalRapid Communications in Mass Spectrometry
Journal citation25 (11), pp. 1514-1520
Digital Object Identifier (DOI)https://doi.org/10.1002/rcm.5008
PubMed ID21594924
Open accessPublished as non-open access
Funder project or codeNorth Wyke Research (NWR)
ISSN09514198
0951-4198
PublisherWiley

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