Effects of leaf hairs on leaf temperature, gas exchange and water use efficiency
To quantify how leaf hairs would influence CO2 and H2O exchange, water use efficiency (WUE, the ratio of CO2 and H2O exchange rates) and leaf temperature, we simulated gas exchange and leaf temperature for a range of combinations of parameters (resistance added by hairs, leaf size, wind speed, stomatal conductance, incident radiation, air temperature and ambient humidity), by combining a steady-state version of the dynamic leaf energy balance model that we used to estimateg bh with a widely used biochemical model of photosynthesis (see Supporting Information Methods S5 for details).