. The Canadian field-naturalist. 1978 GLOOSCHENKO: PLANT BlOMASS, JAMES BAY 31. 0 100 200 SCALE Km LIMIT OF HUDSON BAY LOWLANDS \ QUEBEC Figure 1. Map of Hudson Bay Lowlands showing North Point, site of salt marsh study. the North Point study area. A detailed analysis of the vegetation structure of the North Point salt marshes is in progress. Methods Three transects perpendicular to the shore were set up by surveying with a transit and stadia rod. This was done before the beginning of vegetative growth in mid-May 1976. These transects were approximately 1 km in length and ran from the intertid
. The Canadian field-naturalist. 1978 GLOOSCHENKO: PLANT BlOMASS, JAMES BAY 31. 0 100 200 SCALE Km LIMIT OF HUDSON BAY LOWLANDS \ QUEBEC Figure 1. Map of Hudson Bay Lowlands showing North Point, site of salt marsh study. the North Point study area. A detailed analysis of the vegetation structure of the North Point salt marshes is in progress. Methods Three transects perpendicular to the shore were set up by surveying with a transit and stadia rod. This was done before the beginning of vegetative growth in mid-May 1976. These transects were approximately 1 km in length and ran from the intertidal zone seaward of plant colonization to the edge of a well defined willow- thicket vegetation zone located on an old beach ridge that marked the termination of the salt- marsh complex at North Point. A profile of this is shown in Figure 2. Owing to an absence of bench marks in the area all elevations are relative. Vegetation analysis was done on the transects during 11-13 August 1976 coinciding with the time of apparent peak biomass. Other salt marsh studies have indicated that peak above-ground biomass in salt marshes occurs from late July to mid-August (Tyler 1971; Keefe and Boynton 1973; Wallentinus 1973; Hatcher and Mann 1975). At 10-m intervals a quadrat (1X1 m), was placed on the transect and all species of plants were recorded with an esti- mation of percent cover using Braun-Blanquet's scale (Poore 1955). Sources of plant species names were Gleason and Cronquist (1963) and Porsild (1973). From the results, eight fairly distinct zones of vegetation were present from the lower intertidal zone to the edge of the willow thickets. As a result of a lack of time only one transect was chosen for above-ground biomass studies. In each zone, up to five random tosses of a ^ rectangular quadrat (25 X 50 cm) were made and on each site all above-ground vegetation including attached dead plant parts was clipped with lawn shears. Last year's carry- over of dead plant litter was
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