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Abstract
The forest stand composition within the terrestrial watershed of a small lake on the southern Precambrian Shield was assessed. Total phosphorus inputs from the terrestrial watersheds were obtained for two sub inflows by measuring flow rates and phosphorus concentrations. Direct aerial phosphorus fallout was estimated from nearby sites sampled by the Ontario Ministry of the Environment. Pollen fallout on the 88 ha lake surface was measured during the growing season with a series of floating pollen traps. Detailed microscopic examination was made of the slides prepared from the trapped pollen samples. Pollen grain volumes, species identification, frequency and percentage composition were obtained. Phosphorus contents of several species of pollen grains were calculated for pollen collected directly from broad leaf tree flowers and coniferous strobili. In the old growth watershed, hemlock (
Tsuga canadensis (L.) Carr.) contributed the largest component of pollen-source phosphorus to the ecosystem.
Parent Publication
Citation
Banks, Hugh H.; Nighswander, James E. 2000. Relative contribution of hemlock pollen to the phosphorus loading of the clear lake ecosystem near Minden, Ontario. In: McManus, Katherine A.; Shields, Kathleen S.; Souto, Dennis R., eds. Proceedings: Symposium on sustainable management of hemlock ecosystems in eastern North America. Gen. Tech. Rep. NE-267. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 168-174.
