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Carbon and Nitrogen Dynamics in Preferential Flow Paths and Matrix of a Forest Soil

^a Swiss Federal Institute for Forest, Snow, and Landscape Research (WSL), Zürcherstr. 111, CH 8903 Birmensdorf
^b Paul Scherrer Institute, 5232 Villigen-PSI

View larger version (32K): [in a new window]   Fig. 1. Experimental setup and processed photo of one of the soil profiles with preferential flow paths being visualized by the dye-tracer Brilliant Blue.

View larger version (20K): [in a new window]   Fig. 2. The 13C values of the dominant tree species (Norway spruce), forest floor, and of mineral soil samples from the preferential flow paths and matrix, fine roots of these flow regions, and of the soil solution. Root isotopic signatures are the mean of five sampling dates. Standard errors are given as error bars.

View larger version (16K): [in a new window]   Fig. 3. Relationship between 13C values and soil organic carbon (SOC) concentrations in soil from the preferential flow paths and from the matrix. Means and standard errors of four plots. The slope of the respective regression line is called isotopic discrimination factor.

View larger version (17K): [in a new window]   Fig. 4. The 15N values of the dominant tree species (Norway spruce), forest floor, and of mineral soil samples from the preferential flow paths and matrix, fine roots of these flow regions, and of the soil solution. Root isotopic signatures are the mean of five sampling dates. Standard errors are given as error bars.

View larger version (15K): [in a new window]   Fig. 5. Relationship between 15N values and total nitrogen concentrations in soil from the preferential flow paths and from the matrix. Means and standard errors of four plots. The slope of the respective regression line is called isotopic discrimination factor.

View larger version (27K): [in a new window]   Fig. 6. Progression of 15N values in soil and fine roots of preferential flow paths and matrix before 1, 6, and 12 mo after 15N application in 0- to 9-, 9- to 20-, and 20- to 50-cm depth. For the mineral soil, means and standard errors of three plots for the 15N of the soil are given. Root material from all four plots were pooled to yield enough material for analysis.

View larger version (16K): [in a new window]   Fig. 7. Relationship between 13C and 15N values of leaves (solid square), organic layers (solid triangle), fine roots (open triangle), soil solution (cross), and soil material from preferential flow paths (open rhombus) and from soil matrix (solid dot). Shown are the mean and standard error of four plots. Samples of the mineral soil, soil solution, and fine roots were collected at different depths.