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Decomposition of Nitrogen-15 Labeled Hoop Pine Harvest Residues in Subtropical Australia

^a Cooperative Research Centre for Sustainable Production Forestry, Griffith Univ., Nathan, Qld. 4111, Australia and Faculty of Environmental Sciences, Griffith Univ., Nathan, Qld. 4111, Australia
^b Queensland Forestry Research Institute, P.O. Box 631, Indooroopilly, Qld. 4068, Australia
^c School of Agriculture and Horticulture, Univ. of Queensland, Gatton, Qld. 4343, Australia

View larger version (35K): [in a new window]   Fig. 1. Rainfall and temperature data for the first 24 mo of the decomposition period.

View larger version (29K): [in a new window]   Fig. 2. Differences between bare soil and windrow-covered soil over a 7-d period in October 1999 for: (a) temperature at the 0- to 5-cm soil depth; and (b) soil moisture (shown as soil water potential) at the 0- to 5-cm soil depth.

View larger version (14K): [in a new window]   Fig. 3. Nitrogen-15 enrichment (% of initial 15N enrichment) in the decomposing residues for the single-component microplots in the 30-mo period for: (a) foliage, (b) branch, and (c) stem.

View larger version (28K): [in a new window]   Fig. 4. Nitrogen-15 enrichment (% of initial 15N enrichment) in the decomposing residues for the combined-residue microplots in the 30-mo period for: (a) foliage, (b) branch, (c) stem, and (d) combined residues.

View larger version (25K): [in a new window]   Fig. 5. Carbon-13 CPMAS NMR spectra for the decomposing foliage residues from the foliage-only microplots at 0, 3, 6, 12, 24, and 30 mo after residue application.

View larger version (20K): [in a new window]   Fig. 6. Carbohydrate C to methoxyl C ratio in the decomposing foliage residue as a function of: (a) residue mass, (b) residue 15N enrichment, (c) residue 15N mass retained, (d) residue N mass retained, and (e) residue total N concentration (g kg–1).

View larger version (16K): [in a new window]   Fig. 7. Soil 15N recovery (% of initial residue15N added) at the 0- to 5-, 5- to 10-, and 10- to 20-cm depths in the 30-mo period for: (a) foliage-only, (b) branch-only, (c) stem-only, and (d) combined-residues microplots.

View larger version (13K): [in a new window]   Fig. 8. Total 15N recovery (% of the initial added residue15N) in the decomposing residues and the top 20-cm soil within the microplots in the 30-mo period for: (a) foliage-only, (b) branch-only, and (c) combined residues; there was no significant relationship between total 15N recovery and decomposition period in the stem-only microplots (p > 0.05).