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Evaporation and radiation interception by neighbouring plants

This paper presents the ERIN model, for estimating evaporation and radiation interception by neighbouring species of plants. the model contains a comparatively simple theoretical framework which couples transpiration and the interception of light in multi‐species mixtures, such as those which occur in many natural and man‐made plant communities including grasslands, savannahs, crop/weed mixtures and the results of intercropping and agroforestry. the light‐interception sub‐model can estimate the individual amounts of radiation intercepted by the components of a multi‐species mixture based on a knowledge of the canopy height, leaf area and extinction coefficient of each constituent. In homogeneous plant mixtures, the light sub‐model in ERIN compares well with other more complex models of light interception. A simple method for dealing with spatially heterogeneous canopies is also included, based on a knowledge of the canopy cover and the clumping of the foliage of each species within the canopy. the transpiration sub‐model in ERIN allows the evaporation from each component of a multi‐species mixture to be calculated. It also has the advantage that it allows for microclimatic interactions between the different canopies and that it is coupled to the competition for light. the way in which the fluxes of heat and water vapour from one canopy can affect the microclimate and transpiration from another canopy is also illustrated.