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Leaching of Dissolved Organic Carbon and Carbon Dioxide Emission after Compost Application to Six Nutrient-Depleted Forest Soils

^a Department of Soil Ecology, BITÖK, University of Bayreuth, Dr. Hans-Frisch-Straße 1-3, 95440 Bayreuth, Germany
^b School of Renewable Natural Resources, Louisiana State University AgCenter, Baton Rouge, LA 70803
^c Institute of Soil Science and Forest Nutrition, University of Göttingen, Büsgenweg 2, 37077 Göttingen, Germany

View larger version (33K): [in a new window]   Fig. 1. Mean (a) soil respiration rates, dissolved organic carbon (DOC) concentrations in seepage water at (b) 10 cm and (c) 100 cm in the control and compost plots, and (d) monthly sums of throughfall and daily soil matric potentials at 10 cm in the beech forest at Solling (SB) from summer 1997 to spring 2000. Error bars represent the standard error of the mean.

View larger version (33K): [in a new window]   Fig. 2. Mean (a) soil respiration rates, dissolved organic carbon (DOC) concentrations in seepage water at (b) 10 cm and (c) 100 cm in the control and compost plots, and (d) monthly sums of throughfall and daily soil matric potentials at 10 cm in the spruce forest at Solling (SS) from summer 1997 to spring 2000. Error bars represent the standard error of the mean.

View larger version (35K): [in a new window]   Fig. 3. Mean (a) soil respiration rates, dissolved organic carbon (DOC) concentrations in seepage water at (b) 10 cm and (c) 100 cm in the control and compost plots, and (d) monthly sums of throughfall and daily soil matric potentials at 10 cm in the pine forest at Solling (SP) from summer 1997 to spring 2000. Error bars represent the standard error of the mean.

View larger version (33K): [in a new window]   Fig. 4. Mean (a) soil respiration rates, dissolved organic carbon (DOC) concentrations in seepage water at (b) 10 cm and (c) 100 cm in the control and compost plots, and (d) monthly sums of throughfall and daily soil matric potentials at 10 cm in the beech forest at Unterlüß (UB) from summer 1997 to spring 2000. Error bars represent the standard error of the mean.

View larger version (36K): [in a new window]   Fig. 5. Mean (a) soil respiration rates, dissolved organic carbon (DOC) concentrations in seepage water at (b) 10 cm and (c) 100 cm in the control and compost plots, and (d) monthly sums of throughfall and daily soil matric potentials at 10 cm in the spruce forest at Unterlüß (US) from summer 1997 to spring 2000. Error bars represent the standard error of the mean.

View larger version (34K): [in a new window]   Fig. 6. Mean (a) soil respiration rates, dissolved organic carbon (DOC) concentrations in seepage water at (b) 10 cm and (c) 100 cm in the control and compost plots, and (d) monthly sums of throughfall and daily soil matric potentials at 10 cm in the pine forest at Unterlüß (UP) from summer 1997 to spring 2000. Error bars represent the standard error of the mean.

View larger version (14K): [in a new window]   Fig. 7. Percent of compost C found in seepage fluxes at 10 and 100 cm in the Solling and Unterlüß beech (SB, UB), spruce (SS, US), and pine (SP, UP) stands from August 1997 to March 2000.