In our experiment we evaluated the soil salinity and corresponding stomatal conductance rates of Malosma laurina and Rhus integrifolia located near the coast and farther inland. Our prediction was that stomatal conductance would vary with the change in location of each species. Stomatal conductance was measured using a simple diffusion porometer and soil salinity was measured using a refractometer. We concluded that soil salinity caused a decline in stomatal conductance in both chaparral species. M. laurina was also found to be more sensitive to an increase in soil salinity, as its stomatal conductance rates declined more than that of R. integrifolia.
King, Ron; Malyak, Lisa; and Rausch, Kelly, "Soil Salinity and Stomatal Conductance on Chaparral Plants" (2009). Pepperdine University, Featured Research. Paper 11.