Title	Soil carbon changes and uncertainties with New Zealand land-use change
Author	Tate, Kevin; Wilde, R. H.; Giltrap, David J.; Baisden, W. T.; Saggar, Surinder; Trustrum, Noel A.; Scott, N. A.
Conference or Meeting	SuperSoil 2004: 3rd Australian New Zealand Soils Conference, 5–9 December 2004, University of Sydney, Australia
Permanent Link (URL)	http://doi.org/10.7931/DL1D59
Date	2004
Citation	Tate K, Wilde RH, Giltrap DJ, Baisden WT, Saggar S, Trustrum NA, Scott NA 2004. Soil carbon changes and uncertainties with New Zealand land-use change. In: Singh B. ed. Supersoil 2004: program and abstracts for the 3rd Australian New Zealand Soils Conference, University of Sydney, Australia, 5–9 December 2004.
DOI	doi:10.7931/DL1D59
Keywords	soil carbon; land-use change; monitoring; New Zealand
Abstract	An IPCC-based Carbon Monitoring System (CMS) is being implemented to monitor soil C stocks and flows for New Zealand. Geo-referenced soil C data from 1153 sites (0.3 m depth) are used in the current version to assign steady-state soil C stocks to various combinations of soil class, climate, and land use. Overall, CMS estimates of soil C stock are consistent with detailed, stratified soil C measurements at specific sites and over larger regions. Soil C changes accompanying land-use changes were quantified using a national set of land-use effects (LUEs) derived using a General Linear Model. Predicted and measured soil C changes for the grazing–forestry conversion agreed closely. Most soil C is stored in grazing lands (1480±60 Tg to 0.3 m depth), which appear to be at or near steady state; their conversion to exotic forests and shrubland contributed most to the predicted national soil C loss of 0.7±0.3 Tg C yr-1 during 1990–2000. Major uncertainties arise from estimates of changes in the areas involved, the assumption that soil C is at steady state for all land-cover types, and from lack of soil C data for some LUEs. Other uncertainties in our current soil CMS include: spatially integrated annual changes in soil C for the major land-use changes; lack of soil-C-change estimates below 0.3 m; C losses from erosion; and the contribution of agricultural management of organic soils.
Extent	7 pages
Related URL	http://www.regional.org.au/au/asssi/supersoil2004/s10/oral/1428_tatek.htm
Type	Conference Item - Paper
Format	application/pdf
Rights	Copyright © 2004 The Authors.
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Soil carbon changes and uncertainties with New Zealand land-use change

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