. The Canadian field-naturalist. . Figure 3. Photograph of Zone 5. Area in foreground is documented by Plantago marilima while Triglochin maritima and Potentilla egedii are adjacent to it. Boreal forest is in background. dominated by Juncus balticus, Cicuta maculata, and other more terrestrial species. A possible explanation for this higher biomass is that vegetative growth begins relatively early in this zone as observed in May by the presence of unidentifiable green shoots up to 5 cm in height. During the third week of May 1976, vegetation was already growing in this zone and on the beach ri
. The Canadian field-naturalist. . Figure 3. Photograph of Zone 5. Area in foreground is documented by Plantago marilima while Triglochin maritima and Potentilla egedii are adjacent to it. Boreal forest is in background. dominated by Juncus balticus, Cicuta maculata, and other more terrestrial species. A possible explanation for this higher biomass is that vegetative growth begins relatively early in this zone as observed in May by the presence of unidentifiable green shoots up to 5 cm in height. During the third week of May 1976, vegetation was already growing in this zone and on the beach ridges (Zone 3), while in Zones 4-7, the ground was still frozen several centimetres below the surface and only a few vegetative shoots or rosettes had started to appear above ground, mainly Puccinellia lucida. The intertidal area, Zones 1 and 2, was still covered by ice for the most part. In mid-May 1977, ice was not present in Zone 1 and Puccinellia phyrganodes had started to grow, with blades up to 2 cm in length. Thus, it appears that Zone 8 may be character- ized by a longer growing season. Next to Zone 8, the Carex paleacea zone (Zone 6) had highest above-ground biomass closely followed by Zone 1 (lower intertidal). The lowest biomass values were obtained in the xeric beach ridges; next lowest is Zone 5 which tends to be xeric and possibly higher in salt content, based upon visual observations. Thus it appears that important factors determining the distribution of productivity at North Point include length of growing season as influenced by soil and sediment temperature, soil moisture regime, and salinity. Comparing North Point data with other available data for salt marsh above-ground biomass. Table 2 was compiled using only more northerly salt-marsh data. A weighted mean above-ground biomass was calculated using width of zones and biomass of each zone for North Point excluding the beach ridges. This weighted mean was 357 g/m^ with a range of 29 599g/m2. This appears somew
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