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Placic and Ortstein Horizon Genesis and Peatland Development, Southeastern Newfoundland

^a Eastern Cereal and Oilseed Research Centre, Agriculture Canada, Ottawa, ON, Canada K1A 0C6

View larger version (46K): [in a new window]   Fig. 1 Study site location, Pedons 1 through 8 (P1 to P8), and locations of 14C dates of organic soils (yr BP). Pedon 2* is located in the upland poor fen in a better drained topographic position SW of P2. See Table 1 and 3 for pedon descriptions

View larger version (31K): [in a new window]   Fig. 2 Average daily soil temperatures (point graph), total daily rain depths (bar graph), and water table depths at selected locations in the peatland complexes (point graph) during the study period. Symbol legends for soil temperature and water table depth indicate measurement depths below surface and well locations, respectively. Note: water tables were recorded in soils above the sesquioxide pans

View larger version (35K): [in a new window]   Fig. 3 Physical properties of pedon mineral soil horizons. Pedon number is given in small box in upper left hand corner of graph sets. Grain size (GS) on bar graph: clay = black, silt = white, sand = diagonal stripes; horizontal hydraulic conductivity Kz = , vertical hydraulic conductivity Kx = ; bulk density Db = • (averages of at least 5 samples). Saturated hydraulic conductivity Ksat values are geometric averages of at least 3 samples

View larger version (36K): [in a new window]   Fig. 4 Average daily relative saturation S () and redox potential (•) profiles for selected pedons on Days 193, 194, 196, and 204. Dotted S and redox lines are for Pedon 2*. Dashed lines indicate standing water level in the soil pits. Redox and measurements were taken after the soil pits were pumped free of standing water. Redox potentials are averages of three measurements