Abstract
An understanding of plant-water relationships is essential to the sound management of water catchments. This paper describes a general model of how the availability of soil-water affects the photosynthetic growth of plants. Factors affecting the water status of a plant include precipitation, soil drainage, evaporation, run-off, water uptake by vegetation and transpiration. These factors are combined in a differential equation model to derive a relatively simple, graphical criterion for the survival of a plant. The model has implications for the management of water catchments and could provide a helpful approach to the study of the successional process and of inter-plant competition for soil water.
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