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Nutrient cycling under 450-year-old Douglas-fir stands

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dc.contributor.advisor Lavender, Denis P.
dc.creator Abee, Albert
dc.date.accessioned 2009-09-29T15:48:37Z
dc.date.available 2009-09-29T15:48:37Z
dc.date.issued 1973-01-04
dc.identifier.uri http://hdl.handle.net/1957/12835
dc.description Graduation date: 1973 en
dc.description.abstract To investigate the movement of elements (N, P, k, Ca, and Mg) from the tree crowns by natural litterfall and leave wash, plots were established on six 450 year-old growth stands at the H. J. Andrews Experimental Forest. The following are the results of the data analyses. Elemental concentrations contained in throughfall samples varied throughout the year and tended to follow a seasonal cycle. Concentrations were lowest during the winter when precipitation was greatest and highest during the summer months when precipitation was lowest. Nutrient return in throughfall generally followed the same trend as did the concentration curves. The general mobility of the various mineral elements was demonstrated. For example 12% of the N, 39% of the P, 74% of the K, 9% of the Ca, and 37% of the Mg was returned in the leaf and litter wash. Average litter production for all stands during the 2 years was 5.520 metric tons/hectare. Litterfall was maximum during the winter months. The average total kg/hectare return of nutrients in litterfall was N 26.7, P 4.6, K 75., Ca 49.9, and Mg 3.8. The greatest portion, 63% of the nutrient return, came through needle litterfall. Together, the needle, cone, and twig litterfall accounted for 84% of the total nutrient input through litterfall. en
dc.language.iso en_US en
dc.subject.lcsh Douglas fir en
dc.title Nutrient cycling under 450-year-old Douglas-fir stands en
dc.type Thesis/Dissertation en
dc.degree.name Master of Science (M.S.) in Forest Management en
dc.degree.level Master's en
dc.degree.discipline Forestry en
dc.degree.grantor Oregon State University en
dc.description.digitization Master files scanned at 600 dpi using Ikon Image Runner 8500. File saved using Adobe Acrobat Professional ver. 8 en

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