Browsing by Author "Dyrness, C.T."

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    Nutrient Cycling In 37- And 450-Year-Old Douglas-Fir Ecosystems
    (2007) Grier, C.C.; Cole, D.W.; Dyrness, C.T.; Fredrfksen, R.L.
    Biomass and nitrogen, phosphorus, potassium, and calcium distribution, and biogeochemica1 and stand nitrogen, phosphorus, potassium, and calcium budgets were determined for 37- and 450-year-old Pseudotsuga menzieaii (Mirb.) Franco stands in the U.S. Pacific Northwest. Biomass of the 450-year-old stand is greater, but annual growth is less than that of the 37-year-old stand. About 50% of the annual growth and over 50% of the nutrient uptake and return in the 450-year-old stand occurs in subordinate vegetation compared with less than 15% in the 37-year-old stand. Chemical differences in soil parent material between the two stands are reflected in both the biogeochemical and stand nutrient cycles.