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DIVISION S-7—FOREST & RANGE SOILS

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

* Corresponding author (kermit.cromack{at}orst.edu)

We sampled pure Douglas-fir (DF) [Pseudotsuga menziesii (Mirb.) Franco] and mixed red alder (Alnus rubra Bong.)(RA) and DF (RA/DF) stands in 1980 and in 1999 to investigate the influence of RA on soil C and N pools. In RA/DF plots with 25% RA, the soil N pool to a 45-cm depth increased significantly (P < 0.05) by 190 g N m^-2, corresponding to 10 g N m^-2 yr^-1 accretion. The average between treatment soil N difference in 1999 was 166 g m^-2, representing N accretion of 8.7 g m^-2 yr^-1. In pure DF plots, the soil N pool remained nearly constant. Resin N mineralization in RA/DF plots was about ten fold greater than on pure DF plots, but the enhanced resin N availability did not affect DF foliar N concentration. Temporal plot pairing was necessary within this landscape with high spatial variability to detect significant changes in soil N pools, and only large effects, such as N addition by RA, could be identified with statistical significance. Minimum detectable difference (MDD) estimates for mean total soil C differences in RA/DF plots showed that it would require about 30 more years of C accretion to detect differences at P < 0.05. Conversely, total soil N accretion in RA/DF plots was 28% greater than the MDD after 19 yr.

Abbreviations: DF, Douglas-fir • MDD, minimum detectable difference • RA/DF, a mixed stand of red alder and Douglas-fir • RA, red alder

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