Fig. 1
From: Predicting wood density of growth increments of Douglas-fir stands in New Zealand
Relationships between the predicted breast height wood density of ring 30 from pith and temperature and adjusted soil C:N ratio (i.e. C/(N − 0.014). a Wood density vs mean annual temperature. b Wood density vs adjusted soil C:N ratio. c residuals from wood density = a + b × (adjusted soil C:N ratio) regression vs mean annual temperature. d Residuals from wood density = a + b × (mean annual temperature) regression vs adjusted soil C:N ratio