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Table 4 Correlations between Douglas-fir basic wood density, temperature (MAT), soil C/(N − 0.014), and ring number (R), based from 32 sites throughout New Zealand. The wood density variables analysed include the measured breast height outerwood density (Dow) and predicted outerwood density of ring 30 from pith (D30). The table shows wood density Pearson correlations (r) with each variable and partial correlations with each variable adjusted for the other two variables (partial r)

From: Predicting wood density of growth increments of Douglas-fir stands in New Zealand

Variable

D ow

D 30

r

Partial r

r

Partial r

MAT

0.82**

0.90**

0.85**

0.91**

C/(N − 0.014)

0.26

0.62**

0.21

0.64**

R

0.36*

0.40*

0.11

− 0.16

  1. Statistical significance indicated by * (p < 0.05) and ** (p < 0.01)