Salinity stress

High concentrations of toxic ions in the soil can lead to decreased photosynthesis and growth, if taken up by the plant. Soil salinity reducing photosynthesis can optionally be simulated (see switch Salinity stress). One option is to simulate salinity stress as a decrease in photosynthesis, such as:

                                            (5.35)

where the salinity reduction function, f(π(z)) is the same reduction function used for the reduction of plant water uptake, eq. 3.34. The parameters in the function, π_c and p_π can be found in this sections parameter list as well as in the water uptake section.

Alternatively, the salinity reduction function, f(π(z)) can be used to increase respiration as a response to increased salinity (see eq.X).