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Biotic and Abiotic Nitrogen Retention in a Variety of Forest Soils

^a Desert Research Institute, 2215 Raggio Parkway, and Environmental and Resource Sciences, Univ. of Nevada, Reno, NV 89512 USA
^b Dep. of Environmental Studies, Univ. of California, Santa Cruz, CA 95064 USA
^c Dep. of Forest Sciences and Natural Resource Ecology Lab., Colorado State Univ., Fort Collins, CO 80523 USA

View larger version (28K): [in a new window]   Fig. 1 Carbon dioxide concentration in the headspace of incubated soils with and without HgCl2

View larger version (26K): [in a new window]   Fig. 2 Nitrogen concentration in samples from the study sites (see Table 1 for code). (Note that Oa horizons were either not present or too thin to be sampled at the ULVC and SB sites.)

View larger version (28K): [in a new window]   Fig. 3 C:N ratio in samples from the study sites (see Table 1 for code)

View larger version (25K): [in a new window]   Fig. 4 Oa and A horizon pH and A horizon base saturation for samples taken from the study sites (see Table 1 for code)

View larger version (24K): [in a new window]   Fig. 5 15N natural abundance in samples from the study sites. (see Table 1 for code.)

View larger version (29K): [in a new window]   Fig. 6 Biotic N immobilization samples from the study sites (see Table 1 for code). In the A horizons, values are plotted on the basis of soil weight (100 x mg N kg soil-1) and on the basis of organic matter weight in soil (mg N kg OM-1). Values on the soil weight basis are multiplied by 100 for scale

View larger version (27K): [in a new window]   Fig. 7 Plots of biotic and Abiotic N immobilization against N concentration. Correlation coefficients (r2) are shown for power function regressions of the form y = a(xb) of biotic N immobilization and N concentration in the O horizons

View larger version (32K): [in a new window]   Fig. 8 Abiotic N immobilization samples from the study sites (see Table 1 for code). In the A horizons, values are plotted on the basis of soil weight (100 x mg N kg soil-1) and on the basis of organic matter weight in soil (mg N kg OM-1). Values on the soil weight basis are multiplied by for scale

View larger version (59K): [in a new window]   Fig. 9 Percentage abiotic and biotic N immobilization in O and A horizons from the study sites (see Table 1 for code)