Heterogeneity of decomposition and nutrient dynamics of oak (Quercus) logs during the first 2 years of decomposition

Document Type

Article

Publication Date

1-1-1992

Abstract

Decomposition of oak logs (25-35 cm diameter, 3 m long) was compared among log substrates in Oregon, Minnesota, Kansas, and North Carolina during the first 2 yr on the ground. Decomposition rates (k) for integrated logs averaged 0.28 ± 0.04 yr-1 (mean ± 1 SD) during this initial period. Decomposition reflected qualitative differences among log substrates. Inner bark had the highest nutritional quality and was the focus of insect and microbial activity; only 20% of initial mass remained after 2 years (k = 0.59 ± 0.15 yr-1). Sapwood decayed more slowly than heartwood, with an overall decay rate of 0.20 ± 0.15 yr-1). Heartwood lost 50% of its mass during the first year, but showed no further loss during the second year, for an overall decay rate of 0.31 ± 0.05 yr-1. Nutrient content generally declined during decomposition, but P accumulated in heartwood and Na accumulated in sapwood and heartwood during the second year. -from Author

Publication Source (Journal or Book title)

Canadian Journal of Forest Research

First Page

161

Last Page

166

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