Secondary succession ofSphagnummosses was studied for 7 years along a belt transect in a bog that had been impacted by sodium chloride highway deicing salts. Laboratory studies onSphagnum fimbriatumWils., the dominant recolonizing species, were conducted to determine its salt tolerance level and ability to reproduce from spores and fragments across a salt gradient. Vegetative reproduction was also compared with that of four other recolonizing species.Sphagnum fimbriatumrepresented a high percentage of all recolonizingSphagnumand generally began growing on low hummocks in quadrats where the salt content of the interstitial peat pore waters had dropped to about 300ensp;mg/L as chloride. This salt concentration was also found to be the basic tolerance limit for mature plants and reproducing spores and fragments. The success ofSphagnum fimbriatumas a pioneer species seems to be associated with its prolific production and probable dispersal of spores, its superior vegetative reproduction, its tolerance of mineralized waters, and its ability to grow on hummocks out of direct contact with mineralized waters.
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