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Long‐term release of carbon from grassland soil amended with different slurry particle size fractions: a laboratory incubation study
Author(s) -
Grilo João,
Bol Roland,
Dixon Elizabeth R.,
Chadwick David,
Fangueiro David
Publication year - 2011
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.5008
Subject(s) - slurry , chemistry , manure , soil water , grassland , abundance (ecology) , soil science , soil carbon , particle size , environmental chemistry , incubation , soil respiration , soil test , agronomy , environmental science , ecology , environmental engineering , biology , biochemistry
Application of animal manure to agricultural soils enhances both native soil carbon (C) and overall (native soil C and added C) respiration. CO 2 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 µm) to a grassland soil. The slurry‐derived C present in the soil was traced using the natural abundance δ 13 C 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 13 C 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 δ 13 C 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 © 2011 John Wiley & Sons, Ltd.