Long-term release of carbon from grassland soil amended with different slurry particle size fractions: a laboratory incubation study
- Grilo, J.
- Bol, R.
- Dixon, E. R.
- Chadwick, D. R.
- Fangueiro, D.
DOIAbstract
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. ...
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