Abstract
AbstractThe net rate of photosynthesis at different water contents of three species of Sphagnum, found growing on ombrotrophic mires, was studied. No significant difference was found between S. balticum (hollow species) and S. fuscum (hummock species) in their response to low water content, but S. tenellum (hollow species) was slightly more sensitive than S. balticum in this respect. The water content response is, thus, not simply related to the natural habitat of the species. In dry weather, S. fuscum had a much higher water content in its capitula than had the other species which suggests that the occurrence of a species on hummocks is more related to its ability to transport water to living parts than to the response of the photosynthetic rate to water content.
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