. The Canadian field-naturalist. 402 The Canadian Field-Naturalist Vol. 89. 'A Figure 2. Aerial photograph of the road dam. In the treed peatland (left) the cut line along the transect is visible, roughly parallel to the highway. In the open peatland (right) the line is not visible, but the darker area in the bottom third (approximate- ly) of the area is what was designated low-shrub fen, whereas the upper two-thirds were designated graminoid or low-shrub bog (see Figure 4). The view is oriented with south at the bottom, north at the top. et al. 1974). Zones of similar vegetation were then seg
. The Canadian field-naturalist. 402 The Canadian Field-Naturalist Vol. 89. 'A Figure 2. Aerial photograph of the road dam. In the treed peatland (left) the cut line along the transect is visible, roughly parallel to the highway. In the open peatland (right) the line is not visible, but the darker area in the bottom third (approximate- ly) of the area is what was designated low-shrub fen, whereas the upper two-thirds were designated graminoid or low-shrub bog (see Figure 4). The view is oriented with south at the bottom, north at the top. et al. 1974). Zones of similar vegetation were then segregated along each transect. In mid-August 1969 peat depths were measured (mean of low and high point in each quadrat), and peat samples were collected. For the peat samples, moist-peat pH values were measured (electronic meter, combination elec- trode, three values averaged). Depths to groundwater (mean of low and high point in each quadrat) were measured and water sam- ples were collected in early September 1970 after a period of summer drought with very little precipitation. The samples were collected in polyethylene bottles treated with iodine to reduce biological activity (MacKereth 1963), stored frozen in the dark, and filtered before analysis. Measurements and analyses included water pH (electronic meter), conductivity (/<.mhos/cm at 77°F (25°C) minus contribu- tion owing to hydrogen ion concentrations, K^orr in Sjors 1952), alkalinity (titration with HCl, MacKereth 1963), calcium and magnesium (atomic absorption spectrophotometry), potas- sium (flame-emission spectrophotometry), sul- phate (turbidimetric method. Anonymous 1969), and ferric and ferrous iron (1, 10- phenanthroline method. Anonymous 1969). For the treed peatland transect, three black spruce trees in or close to each quadrat were measured for height and age at ground level and site index (height at 50 years) derived from height - age curves (Plonski 1956). Results The open, flooded side of the highway
Size: 2580px × 969px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorottawafieldnaturalistsclub, bookcentury1900, bookcolle
