Estimating ratio of surface area to volume for dead needles
AbstractA method for estimating the ratio of surface area to volume for dead needles was developed. The method is based on the simplification proposed by Brown (1970), but the requested values (surface area and perimeter) have been obtained, on micrometrical cross sections, through an image analyzer. The propopsed method gather the necessary conditions of accuracy and rate. The ratio of surface area to volume (σ) is closely related to the fire behaviour in the different forest fuels. Therefore, this physical characteristic has been determinated for fine dead fue particles that taje part, frecuently, in forest fires. The values obtained for Pinus pinaster Ait., P. pinea L. and P. halepensis Mill. are, respectively, 48.24, 57.80 and 79.93 cm-1. The results show variations among species. Nevertheless, differences due to sampling areas have not been founded.
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