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New Zealand Journal of Forestry Science
Figure 2 | New Zealand Journal of Forestry Science

Figure 2

From: Diameter growth rates of tawa (Beilschmiedia tawa) across the middle North Island, New Zealand – implications for sustainable forest management

Figure 2

The effect of soil parent material on tawa stem growth rate across the middle North Island. The effect was modelled by fitting a median growth model to all tawa data (Figure 1a) and then examining how the residuals from that model varied with soil parent material. Box width is proportional to the number of observations in each soil parent material type. Basa = volcanic basalt; Rhyo = volcanic rhyolite; Ande = volcanic andesite; Tert = Tertiary sedimentary; Old = older sedimentary; Allu = alluvial. Only residuals on Tertiary Sedimentary were significantly different from all others (shown in red, GLM to test for differences among means P < 0.05).

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