. The Canadian field-naturalist. Treed Bog 4 111 Swamp I Upland North 0 100m 2OO1 all Ik **. 3001 400m South Figure 7. Profile sketch of the transect in the treed peatland. Zone 1—Speckled Alder (Alnus rugosa) swamp; Zone 2—Black Spiuce {Picea mariana)/Speckled Alder swamp; Zone 3—Black Spruce/ Sphagnum-Schrehefs Feather Moss {Pleuroziiim schrebeii) swamp; Zone 4—Black Spruce/Labra- dor-tea {Ledum groenlandicum) swamp; Zone 5—Black Spruce/Leather-leaf {Chamaedaphne caly- culata) treed bog; Zone 6—Black Spruce/Labrador-tea swamp; Zone 7—White Cedar (Thuja oc- cide?itaIis) Fir (Abies bals
. The Canadian field-naturalist. Treed Bog 4 111 Swamp I Upland North 0 100m 2OO1 all Ik **. 3001 400m South Figure 7. Profile sketch of the transect in the treed peatland. Zone 1—Speckled Alder (Alnus rugosa) swamp; Zone 2—Black Spiuce {Picea mariana)/Speckled Alder swamp; Zone 3—Black Spruce/ Sphagnum-Schrehefs Feather Moss {Pleuroziiim schrebeii) swamp; Zone 4—Black Spruce/Labra- dor-tea {Ledum groenlandicum) swamp; Zone 5—Black Spruce/Leather-leaf {Chamaedaphne caly- culata) treed bog; Zone 6—Black Spruce/Labrador-tea swamp; Zone 7—White Cedar (Thuja oc- cide?itaIis) Fir (Abies balsaiiiea)/Speckled Alder swamp. Quadrats were located at 10-m intervals along the transect. (see Appendix B* for other species occurring in these zones). Zone 2 is Black Spruce/Speckled Alder swamp, which occurs closest to the nutrient- rich, marginal Speckled Alder swamp (zone 1) (Figure 9) and, by implication, is the richest Black Spruce swamp type. Site indices (Figure 8), however, suggest that tree growth is as good in zone 3 as in zone 2. Zone 3 is shrub-poor undoubtedly because of the shading by the dense Black Spruce canopy. Two phases are represented, Black Spruce/Sphagnum swamp and Black Spruce/ Schreber's Feather Moss swamp (Figure 9). Both phases are more extensive elsewhere and are recognized as site types of Black Spruce swamp (Jeglum et al. 1974). Zones 4 and 6 are both characterized as Black Spruce/Labrador-tea swamp (Figure 9). Zone 6 has a swath cut out of it, demonstrating that logging occurs in the Black Spruce/Labra- dor-tea site type. The openness of the canopy of this site type is suggested by the mean cover for Black Spruce (all size classes) in zones 4 and 6 (excluding the cut zone), 35% and 28%, respectively. Labrador-tea, Three-seeded Sedge (Carex trisperma), and Schreber's Feather Moss achieve high values in or centering about the Black Spruce/Labrador-tea swamp in both zones 4 and 6 (Figure 9). In addition. Sphag- num nemoreum (= S. capil
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