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Long-Term Effects of Nitrogen Fertilization on Nitrogen Availability in Coastal Douglas-Fir Forest Floors

H.N. Chappell^,a, C.E. Prescott^b and L. Vesterdal^c

^a College of Forest Resources, Univ. of Washington, Seattle, WA 98195 USA
^b Faculty of Forestry, Univ. of British Columbia, 2424 Main Mall, Vancouver, BC V6T 1Z4, Canada
^c Dep. of Forest Ecology, Danish Forest and Landscape Research Institute, Hørsholm Kongevej 11, DK-2970 Hørsholm, Denmark

View larger version (25K): [in a new window]   Fig. 1 Aboveground litterfall C and N in control (closed circles, solid regression line) and fertilized stands (open circles, dashed regression line) along the gradient in soil N capital: (a) C contents, (b) N contents, and (c) C/N ratios. In (a) the values for the fertilized plots at the two sites with highest N capital are the same as those for the control plots

View larger version (16K): [in a new window]   Fig. 2 Forest floor C and N in control (closed circles, solid regression line) and fertilized stands (open circles, dashed regression line) along the gradient in soil N capital: (a) N contents and (b) C/N ratios. Note the logarithmic y-axis

View larger version (17K): [in a new window]   Fig. 3 Fractional annual losses of C and N (annual input of senesced needle litter/forest floor mass) in forest floors of control (closed circles, solid regression line) and fertilized stands (open circles, dashed regression line) along the gradient in soil N capital: (a) C loss and (b) N loss. In (a) the value for the fertilized plots at the site with the lowest N capital is the same as that for the control plot

View larger version (18K): [in a new window]   Fig. 4 Net nitrogen mineralization rates in forest floors from control (closed circles, solid regression line) and fertilized stands (open circles, dashed regression line) along the gradient in soil N capital during a 24-d laboratory incubation in control and fertilized plots. Note the logarithmic y-axis

View larger version (14K): [in a new window]   Fig. 5 Net nitrification rates in forest floors from control (closed circles, solid regression line) and fertilized stands (open circles, dashed regression line) along the gradient in soil N capital during a 24-d laboratory incubation. Bars indicate standard errors