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Structure and Function of Peatland-Forest Ecotones in Southeastern Alaska

Soil Science Graduate Group, Dep. of Land, Air, and Water Resources, Univ. of California, One Shields Ave., Davis, CA 95616-8627

View larger version (41K): [in a new window]   Fig. 1. Location of pedons, wells, tree plots, and soil respiration rings at Common Snipe (CS). Insets show locations of CS and five extensive sites on Mitkof Island as well as the location of Mitkof Island in southeastern Alaska.

View larger version (22K): [in a new window]   Fig. 2. Mean (+ 1 SE) soil respiration rates (1998 to 2001) for four Common Snipe stations. For each year, forest interior rates were significantly greater (P < 0.05) than bog interior, bog edge, or forest edge rates.

View larger version (17K): [in a new window]   Fig. 3. Mean Common Snipe edge values (solid triangles) for 15 properties normalized to the ranges defined by mean bog interior (left side; open circles; -1) and forest interior (right side; open squares; +1) values. If an edge value were the average of the corresponding bog and forest interior values for a particular property, it would plot in the center of the graph with a value of 0. Hyd. cond. (hydraulic conductivity at 25 cm); original units as in Tables 1 and 4 and Fig. 2.

View larger version (34K): [in a new window]   Fig. 4. Conceptual model based on soil respiration rates, tree biomass carbon estimates, and soil organic carbon pool sizes for the bog-forest ecotone at Common Snipe. Dissolved organic carbon (DOC) could link different parts of the catena.