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Soil Carbon and Nitrogen Changes Under Douglas-fir With and Without Red Alder

^a Unit of Forest Nutrition and Water Resources, Dep. of Ecology, Technical Univ. of Munich, Am Hochanger 13, D-85354 Freising, Germany
^b Jr., Dep. of Forest Science, 321 Richardson Hall, Oregon State Univ., Corvallis, OR 97331
^c 3342A Kauhana Pl., Honolulu, HI 96816
^d Faculty of Forestry, Univ. of Istanbul, Soil Science and Ecology Dep., 80895 Bahcekoy, Istanbul, Turkey
^e Dep. of Forest Resources and Environmental Sciences, Korea Univ., Seoul 136-701, Korea

View larger version (29K): [in a new window]   Fig. 1. Resin N mineralization in red alder and Douglas-fir plots during summer 1999. Error bars indicate means ± standard error. The three bar graphs show (a) resin available NH4–N, (b) resin available NO3–N, and (c) resin total mineral N (NH4–N + NO3–N).

View larger version (13K): [in a new window]   Fig. 2. Relationship between N concentration of Douglas-fir mature needles and proportion of red alder in an 8-m diam. circle.