Quantifying the small-scale owners' estate in Canterbury, Otago and Southland (2017)
Type of ContentJournal Article
According to the National Exotic Forest Description (NEFD), the small-scale forest estate accounts for 520,000 ha of the New Zealand plantation estate of 1,705,000 ha. It is becoming increasingly important for wood production as the large area of 1990s afforestation matures. However, there is uncertainty about the actual area of the small-scale estate, the percentage of area that will be economic to harvest and its potential future yield. As part of Management Case Study in 2015 and 2016, Bachelor of Forestry Science students mapped the small scale estate in Canterbury, Otago and Southland. Forest boundaries were mapped in a geographic information system (GIS), based on visual interpretation of aerial photography. It was found that the mapped area of small-scale estate is only 56% of the NEFD estimate in Canterbury, 96% in Otago and 75% in Southland. The total plantation area was estimated by adding the NEFD area for the large-scale estate to the mapped area of the small-scale estate. The Land Use and Carbon Analysis System (LUCAS) plantation area is 59%, 18% and 26% higher in the three regions, respectively. These differences arise because LUCAS is based on gross rather than net area and because of misclassification of land-uses. By using a standardised spreadsheet that included harvesting, roading and trucking cost estimates for each block, it was also found that only a small proportion of the small-scale estate is likely to be uneconomic to harvest. On average, only 3% of blocks were classified as uneconomic to harvest at age 28 years in Canterbury, 2% in Otago and less than 1% in Southland. A further 10%, 6% and 5%, respectively, were classified as marginal. Yield forecasts, based on Emissions Trading Scheme Field Measurement Approach (ETS FMA) plots, indicate higher levels of productivity than those used in recent wood availability forecasts. Whether these yields, for a segment of the small-scale estate (i.e. forest growers with over 100 ha participating in the ETS) are representative of the total small-scale estate is unknown. While this study has provided detail on area, cost and volume for the small-scale estates in Canterbury, Otago and Southland, it has also highlighted that we know surprisingly little about the small-scale estate in New Zealand. We do not accurately know the total area, or where it is located, or the yields it will generate. It is proposed that remote sensing techniques be used, in conjunction with existing databases, to address the questions raised.
CitationManley B, Morgenroth J, Visser R, Final year BForSc students (2017). Quantifying the small-scale owners' estate in Canterbury, Otago and Southland. New Zealand Journal of Forestry. 62(3). 24-32.
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ANZSRC Fields of Research30 - Agricultural, veterinary and food sciences::3007 - Forestry sciences
RightsAll rights reserved unless otherwise stated
Copyright NZ Journal of Forestry
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Quantifying the area of the small-scale owners’ forest estate in the East Coast, Hawke’s Bay and Southern North Island Manley B; Morgenroth J; Xu C (2020)The National Exotic Forest Description (NEFD) estimated that, as at 1 April 2016, the small-scale forest estate area in the East Coast, Hawke’s Bay and Southern North Island (SNI-West and SNI-East) wood supply regions ...
Manley, B.; Morgenroth, J.; Visser, R.; Final year BForSc students of 2014 (University of Canterbury. School of Forestry, 2015)The small-scale forest estate, much of which was planted in the 1990s, will provide an increasing proportion of New Zealand’s harvest volumes over the next decade. However there are questions about the proportion of ...
Manley B; Morgenroth J; Visser R; Final year BForSc students of 2014 (2015)The small-scale forest estate, much of which was planted in the 1990s, will provide an increasing proportion of New Zealand’s harvest volumes over the next decade. However there are questions about the proportion of ...