DALEC (Data Assimilation Linked Ecosystem Carbon) represents the C cycle with a simple box model of pools connected via fluxes. There are five pools: C content of foliage (Cf); woody stems and coarse roots (Cw) and fine roots (Cr); and of fresh leaf and fine root litter (Clitter) and soil organic matter (SOM) plus WD (CSOM/WD). The fluxes among pools are based on the following assumptions:
- All C fixed during a day is either expended in autotrophic respiration or else allocated to one of three plant tissue pools – foliage, wood, or fine roots.
- Autotrophic respiration is a fixed fraction of total photosynthetic fixation, and it is not directly temperature sensitive.
- Plant allocation and litterfall are donor-controlled functions with no direct environmental influence and constant rate parameters.
- Soil transformations are sensitive to temperature, with a Q10 of 2.0. Otherwise, the only environmental forcing in the C model is on GPP, via solar radiation, air temperature, and soil moisture.
- All C losses are via mineralization; there is no dissolved loss term.
Williams, M.; Schwarz, P.A.; Law, B.E.; Irvine, J. and Kurpius, M.R. (2005). An improved analysis of forest carbon assimilation using data assimilation. Global Change Biology 11: 89-105.
Originally submitted to PLaSMo on 2010-11-02 10:27:31
Created: 10th Jan 2019 at 17:38