Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Nitrogen, phosphorus and particulate matter budgets of five coniferous forest ecosystems in the western Cascades Range, Oregon /
Author Fredriksen, R. L.
Year Published 1975
OCLC Number 07415123
Subjects Nitrogen. ; Phosphorus. ; Suspended sediments--Oregon. ; Dust. ; Forest ecology--Oregon--Cascade Range. ; Biogeochemical cycles.
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
ESBD  100 OR SSD NPP NHEERL/WED Library/Corvallis,OR 03/10/2017
Collation 127 pages illustrations
Includes bibliographical references (pages 117-122).
Contents Notes
Nutrient and particulate matter balances were established for five ecosystems dominated by Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] in the western Cascades, Oregon. Carriers of N and P were particulate matter (dust in precipitation and sediment in streams) and dissolved matter in both precipitation and stream water. The input and outflow of these materials (particulates, N and P) are interpreted in relation to atmospheric and forest ecosystem processes. Drainage basin sites are FC-2 (north), HJA-7, 9 and 10 (central), and CC-4 (south). Climate at all sites is maritime with cool-wet falls, winters, and springs and warm-dry summers. Soils, from igneous parent materials (Tuff, andesite, basalt), are porous, deep and of loam to silty clay texture. The basins are steep (12-70% slope) and completely covered by natural forest vegetation. varied by a factor of 2 or 3 over the range of runoff among the sites. The N outflow is explained by environmental factors, chemical composition f forest litter and the flushing efficiency of the annual runoff. Organic P may be controlled by litter quality, but ortho-P outflow was greatest where parent materials were dominantly tuff and declined according to the increasing proportions of less easily weathered basalt andesite, Dust depositions were 14. 3% of suspended sediment (SS) outflows, but varied according to the geologic erosion rate among sites. At FC-Z, dust deposition exceeded SS by 177%, but deposition was only 5. 0% of SS at CC-4. Dust deposition was an important source of soil material and partly offset geologic erosion. Mean N inputs, 1. 6-3. 2 times the outflows, were considered important in relation to known inputs by symbiotic fixation. Mean P inputs were 51 % of outflows, but were considered relatively unimportant because of the abundant supply in igneous bedrock.