Canterbury wood availability forecasts for the period 2007–2040

Data

Method used to obtain forest areas

Forest areas were obtained from the NEFD as at 1 April 2005. Changes were made to:

Reflect the regime split in the harvest intentions data, with 3300 hectares in the large-scale owners’ estate transferred from the old pruned croptype into the old unpruned croptype.
Reduce the area in the small-scale owners’ estate by 15 percent, because they generally report on a gross area rather than a net stocked area basis (which excludes unplanted areas, areas not successfully established, streams, wetlands, etc.).
Reduce the area-age classes 1–15 years in the large-scale owners’ estate by 5 percent, following advice from owners.
Allow for intended clearance and deforestation (without commercial harvest), with the removal of a further area of 2200 hectares in the large-scale owners’ estate.

Method used to develop yield tables

In 2006, new yield tables for Canterbury were developed in the following manner:

Large-scale forest owners provided yield tables for their forest estates.
These were averaged on an area-weighted basis to get regional yield tables for each croptype.
Yield tables for old radiata pine (age 16+ years, planted in 1989 and earlier) and Douglas-fir were then calibrated to match the harvest intentions data provided by large-scale owners. The assumption is that the harvest intentions data provide the most accurate information available, as they are based predominantly on detailed inventory.
Yield tables for young radiata pine croptypes (planted in 1990 and later) were also adjusted in consultation with large-scale owners.
The yield tables developed for the large-scale owners’ estate were also applied to the small-scale forest owners’ estate.

Large-scale owners’ harvest intentions

Large-scale owners were asked to provide details of planned harvest volumes by log grades and areas from 2005 to 2015. These harvest intentions were included to provide the most realistic wood availability forecasts over this period.

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