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AVAILABILITY AND UPTAKE OF INORGANIC NITROGEN IN A MIXED OLD-GROWTH CONIFEROUS FOREST
Citation:
Turner, D., P. Sollins, M. Leuking, AND N. Rudd. AVAILABILITY AND UPTAKE OF INORGANIC NITROGEN IN A MIXED OLD-GROWTH CONIFEROUS FOREST. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-93/259 (NTIS PB93212652), 1993.
Description:
Rates of nitrogen mineralization, nitrification and an index of ammonium and nitrate uptake were monitored in a mixed old-growth stand of Douglas-fir (Pseudotsuga menziesii) western hemlock (Tsuga heterophylla) and western redcedar (Thuja plicata) over a two year period. uried bags were incubated in the litter and mineral soil (010 cm) adjacent to large trees for approximately 2-month intervals. haracterization of soil and litter properties found pH lowest near the western hemlock trees. itrogen cycling parameters also differed among the tree species with nitrification, nitrate concentrations, and percent uptake as nitrate highest near the western redcedar trees. hese field observations are consistent with studies of species, differences in nitrate reductase activity and patterns of ammonium and nitrate uptake in solution culture. he results indicate considerable spatial heterogeneity in the dynamics of ammonium and nitrate production within forest stands and species-specific differences in the proportion of inorganic nitrogen taken up as nitrate.
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AVAILABILITY AND UPTAKE OF INORGANIC NITROGEN IN A MIXED OLD-GROWTH CONIFEROUS FOREST