Abstract
A model of the carbon uptake and water balance of forest stands is described where leaf photosynthesis is represented by a mechanistic model of photosynthesis by C 3 plants. Data are presented to support an empirical relationship linking stomatal conductance, photosynthesis, relative humidity and ambient CO 2 concentration. The model was applied to stands of Pinus radiata subject to extremes of water and nutrient availability. Simulated water storage in the root zone agreed with measurements conducted over a 5 year period. Simulated and measured seasonal patterns of water use reached maximum rates of approximately 7 mm day −1 in summer for irrigated stands with projected leaf area indices of approximately 8. Simulated annual net photosynthesis (net of photorespiration and day-time foliar respiration) ranged from approximately 17 Mg C ha −1 year −1 for control stands to approximately 45 Mg C ha −1 year −1 for irrigated and fertilised stands.
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