Decomposition and nitrogen dynamics of ¹⁵N‑labeled leaf, root, and twig litter in temperate coniferous forests Public Deposited

http://ir.library.oregonstate.edu/concern/articles/mw22v7361

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by Springer and can be found at:  http://link.springer.com/journal/442.

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  • Decomposition and nitrogen dynamics of 15N‑labeled leaf, root, and twig litter in temperate coniferous forests
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  • Litter nutrient dynamics contribute significantly to biogeochemical cycling in forest ecosystems. We examined how site environment and initial substrate quality influence decomposition and nitrogen (N) dynamics of multiple litter types. A 2.5-year decomposition study was installed in the Oregon Coast Range and West Cascades using ¹⁵N-labeled litter from Acer macrophyllum, Picea sitchensis, and Pseudotsuga menziesii. Mass loss for leaf litter was similar between the two sites, while root and twig litter exhibited greater mass loss in the Coast Range. Mass loss was greatest from leaves and roots, and species differences in mass loss were more prominent in the Coast Range. All litter types and species mineralized N early in the decomposition process; only A. macrophyllum leaves exhibited a net N immobilization phase. There were no site differences with respect to litter N dynamics despite differences in site N availability, and litter N mineralization patterns were species-specific. For multiple litter × species combinations, the difference between gross and net N mineralization was significant, and gross mineralization was 7–20% greater than net mineralization. The mineralization results suggest that initial litter chemistry may be an important driver of litter N dynamics. Our study demonstrates that greater amounts of N are cycling through these systems than may be quantified by only measuring net mineralization and challenges current leaf-based biogeochemical theory regarding patterns of N immobilization and mineralization.
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  • van Huysen, T. L., Harmon, M. E., Perakis, S. S., & Chen, H. (2013). Decomposition and nitrogen dynamics of ¹⁵N-labeled leaf, root, and twig litter in temperate coniferous forests. Oecologia, 173(4), 1563-1573. doi:10.1007/s00442-013-2706-8
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  • description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2014-03-12T18:58:17Z No. of bitstreams: 1 HarmonMarkForestEcosystemsSocietyDecompositionNitrogenDynamics.pdf: 422380 bytes, checksum: 539eabf8c3894b95eb8cb8abea80184e (MD5)
  • description.provenance : Approved for entry into archive by Deanne Bruner(deanne.bruner@oregonstate.edu) on 2014-03-14T17:23:52Z (GMT) No. of bitstreams: 1 HarmonMarkForestEcosystemsSocietyDecompositionNitrogenDynamics.pdf: 422380 bytes, checksum: 539eabf8c3894b95eb8cb8abea80184e (MD5)
  • description.provenance : Made available in DSpace on 2014-03-14T17:23:52Z (GMT). No. of bitstreams: 1 HarmonMarkForestEcosystemsSocietyDecompositionNitrogenDynamics.pdf: 422380 bytes, checksum: 539eabf8c3894b95eb8cb8abea80184e (MD5) Previous issue date: 2013-12

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