Forest Growth Models


Forest Growth Model

ForGro is a process-oriented, deterministic model. The model is a physiologically based carbon-balance model of forest growth. It describes the flow of water, carbon and nutrients in the forest ecosystem. The model can be described as an integrated and closed-system Forest-Soil-Atmosphere model. Processes that are included consist of: photosynthesis and respiration, phenology, hydrology (detailed and partly empirical), nutrient cycling (mechanistic), forest growth (detailed and partly empirical), and forest structure development. ForGro includes hydrological submodels for calculating snow-fall, canopy water dynamics, forest-floor water dynamics and soil water dynamics. Compartments: - Hydrology: Solution of water content from nutrient balance model. Transpiration from Penman-Monteith. - Nutrient uptake: Driven by demand and limited by radial diffusion from the bulk soil to the root. - Soil chemistry: ForGro uses NuCSAM as submodel. - Forest growth: Photosynthesis is driven by light interception. Gross carbon assimilation is summed per leaf layer. Fixed allocation scheme. - Effect relations: Nutrient shortage, and stomatal uptake of SO2 and O3 in foliage reduce photosynthesis. Al effects root growth and nutrient uptake. Direct uptake of NH3. [source website]