In process-based ecosystem models, a modified Farquhar model is usually used to simulate gross primary production
. We take the dynamic land ecosystem model (DLEM, ) as an example to address how GPP and NPP are represented in modeling scheme.
Using a novel combination of observations and modelling, Christian Beer and colleagues from ten other countries estimated the Earth's gross primary production
(GPP), which represents the total amount of C[O.sub.2] that the world's plant life takes in annually.
Rates of change in DO attributable to gross primary production
and respiration were corrected for diffusion across the air-sea interface using a gas transfer velocity proportional to wind speed (5).
To estimate this energy in wetlands, we measured the Gross Primary Production
(GPP) or the amount of solar energy captured and stored in plants.