Measurements of soil temperature, soil mois- The lack of dense, dwarfed tree stands above ture, and surface temperature were carried out the timberline seems to be a result of natural at different elevations on Pico de Orizaba, Mex- and man-made fire. The main limiting factor to ico, in order to evaluate the ecology (phenology, tree growth is low soil temperature in spring, plant physiology, and surface fire impact) of the which limits water diffusion through plant cell
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Lauer et al. (1975) studied this question.
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