Abstract
Diurnal patterns in leaf water potential were examined on eight red pine trees throughout one summer in northern Minnesota. The daily high in leaf water potential was plotted against total soil moisture to produce a soil—moisture release curve characterizing the plant—soil—atmosphere system. Diurnal patterns in leaf water potential at various soil moistures were compared. Also compared were patterns in leaf water potential under high and low evaporational demand and constant soil moisture. Results were generally consistent with previously constructed models. Very little variation in leaf water potential was observed among whorls or needle ages. Laboratory studies of the effects of leaf water potential when synthesized with data from the forest on occurrence of leaf water potentials suggest that growth was limited by water deficit every day of the 1969 summer.
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