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RECORD NUMBER: 10 OF 34

OLS Field Name OLS Field Data
Main Title Availability and Uptake of Inorganic Nitrogen in a Mixed Old-Growth Coniferous Forest.
Author Turner, D. P. ; Sollins, P. ; Leuking, M. ; Rudd, N. ;
CORP Author ManTech Environmental Technology, Inc., Corvallis, OR. ;Oregon State Univ., Corvallis. Dept. of Forest Science.;Corvallis Environmental Research Lab., OR.
Publisher c1993
Year Published 1993
Report Number EPA/600/J-93/259;
Stock Number PB93-212652
Additional Subjects Growth ; Nitrification ; Forest trees ; Ammonium compounds ; Nitrogen inorganic compounds ; Concentration(Composition) ; Soil properties ; Wood wastes ; pH ; Fir trees ; Containers ; Field tests ; Seasonal variations ; Absorption ; Conifers ; Monitoring ; Oregon ; Reprints ; Pseudotsuga mengiesii ; Douglas fir trees ; Tsuga heterophylla ; Western hemlock trees
Holdings
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NTIS  PB93-212652 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 11/22/1993
Collation 13p
Abstract
Old-growth forest stands of mixed species composition provide the opportunity to study species-specific influences on soil properties. The authors monitored rates of nitrogen mineralization, nitrification and an index of ammonium and nitrate uptake 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. Litter and mineral soil (0-10-cm depth) were sampled adjacent to ten large trees of each species. After initial characterization of litter and soil, buried bags were incubated in both layers for ca. 2-month intervals. Soil and litter pH was lowest near western hemlocks. Nitrification, nitrate concentrations, and percent uptake as nitrate differed among the tree species; rates were highest near western redcedars. For all species, percent nitrification and nitrate uptake rate were higher in soil than in litter. The results indicate species-specific effects on ammonium and nitrate production and uptake within this forest type. (Copyright (c) 1993 Kluwer Academic Publishers.)