HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via ISI Web of Science (7) Citing Articles via Google Scholar Google Scholar Articles by Blumfield, T. J. Articles by Saffigna, P. G. Search for Related Content PubMed Articles by Blumfield, T. J. Articles by Saffigna, P. G. Agricola Articles by Blumfield, T. J. Articles by Saffigna, P. G. Related Collections Nitrogen Residue management Nutrient Management Forest Soils

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).