Grier, C.C.Cole, D.W.Dyrness, C.T.Fredrfksen, R.L.2014-09-082014-09-082007http://hdl.handle.net/123456789/5487Biomass 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.enArticle