Decomposition of nitrogen-15 labeled hoop pine harvest residues in subtropical Australia

Blumfield, T. J., Xu, Z. H., Mathers, N. J. and Saffigna, P. G. (2004) Decomposition of nitrogen-15 labeled hoop pine harvest residues in subtropical Australia. Soil Science Society of America Journal, 68 5: 1751-1761.


Author Blumfield, T. J.
Xu, Z. H.
Mathers, N. J.
Saffigna, P. G.
Title Decomposition of nitrogen-15 labeled hoop pine harvest residues in subtropical Australia
Journal name Soil Science Society of America Journal   Check publisher's open access policy
ISSN 0361-5995
Publication date 2004-09-01
Sub-type Article (original research)
Open Access Status Not yet assessed
Volume 68
Issue 5
Start page 1751
End page 1761
Total pages 11
Editor R. L. Mulvaney
W. A. Dick
N. H. Rhodehamel
Place of publication United States
Publisher Soil Science Society of Americal
Language eng
Subject C1
300103 Soil Chemistry
770702 Land and water management
Abstract Information on decomposition of harvest residues may assist in the maintenance of soil fertility in second rotation (2R) hoop pine plantations (Araucaria cunninghamii Aiton ex A. Cunn.) of subtropical Australia. The experiment was undertaken to determine the dynamics of residue decomposition and fate of residue-derived N. We used N-15-labeled hoop pine foliage, branch, and stem material in microplots, over a 30-mo period following harvesting. We examined the decomposition of each component both singly and combined, and used C-13 cross-polarization and magic-angle spinning nuclear magnetic resonance (C-13 CPMAS NMR) to chart C transformations in decomposing foliage. Residue-derived N-15 was immobilized in the 0- to 5-cm soil layer, with approximately 40% N-15 recovery in the soil from the combined residues by the end of the 30-mo period. Total recovery of N-15 in residues and soil varied between 60 and 80% for the combined-residue microplots, with 20 to 40% of the residue N-15 apparently lost. When residues were combined within microplots the rate of foliage decomposition decreased by 30% while the rate of branch and stem decomposition increased by 50 and 40% compared with rates for these components when decomposed separately. Residue decomposition studies should include a combined-residue treatment. Based on C-15 CPMAS NMR spectra for decomposing foliage, we obtained good correlations for methoxyl C, aryl C, carbohydrate C and phenolic C with residue mass, N-15 enrichment, and total N. The ratio of carbohydrate C to methoxyl C may be useful as an indicator of harvest residue decomposition in hoop pine plantations.
Keyword Agriculture, Soil Science
Soil Organic-matter
Litter Decomposition
C-13 Nmr
Nitrogen Mineralization
Radiata Plantations
Leucaena Residues
Beech Forest
Dynamics
Growth
Fertilization
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 14:50:39 EST