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

New Zealand Journal of Forestry Science

Table 2 Variation in tawa diameter growth rate explained (%) by tree size, soil parent material, and climate

Model	Variation explained (%)
Size + Soil parent material + Winter minimum temperature + Annual Vapour Pressure Deficit	11.7
Size + Soil parent material	10.7
Size + Winter minimum temperature + Annual Vapour Pressure Deficit	1.9
Size	0.5

Variation explained is the coefficients of determination (observed growth correlated against predicted growth, squared) for models of tawa growth in the middle North Island.