Figure - available from: Biogeosciences
This content is subject to copyright.
Outputs of the leaf cohort expansion model over the course of the lifespan of a single leaf from a cohort (produced on day 504 of the rotation at the Itatinga site) in two contrasted K availabilities, +K (a, b) and oK (c, d); leaf water content, leaf K, and leaf surface at the individual leaf scale (a, c); total flux of K at the leaf scale showing the transition from K sink (positive flux to the leaf) to K source (negative flux from the leaf) (b, d). Small negative K fluxes (corresponding to a loss of K from the leaf) during the leaf's existence are K foliar leaching fluxes during precipitation events. The grey line represents the fall of the leaf cohort. The quantity of K that is in the leaf at the moment of leaf fall is added to the K litter pool.
Source publication
The extent of the potassium (K) limitation of forest productivity is probably more widespread than previously thought, and K limitation could influence the response of forests to future global changes. To understand the effects of K limitation on forest primary production, we have developed the first ecophysiological model simulating the K cycle an...
Citations
... This was necessary since CASTANEA was not originately simulating the hydraulic continuum, and the assumption of a fixed root depth made by CASTANEA was not valid in the studied system. Details on the development of the CASTANEA-MAESPA coupled model can be found in (Cornut et al., 2022a;Cornut et al., 2022b). A schematic overview of the model is given in Figure 1. ...
... Simulations were compared with measured biomasses for a five-year rotation. Notably, the CASTANEA-MAESPA model also simulates the K cycle, as described in (Cornut et al., 2022a) which also allowed to test the impact of rainfall reduction on biomass production under K omission. ...
