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Table 1 Summary of the different wood density datasets that were used to develop the various models

From: Modelling variation in wood density within and among trees in stands of New Zealand-grown radiata pine

  Five-ring density samples at breast-height Disc-level data collected on felled trees Ring-level densitometry data at breast-height
Region Number of sites Number of trees Age (years) Number of sites Number of trees Age (years) Number of sites Number of trees Age (years)
    Min. Max. Mean    Min Max Mean    Min. Max. Mean
Auckland 50 1592 16 57 32 30 312 14 53 31 4 66 19 33 26
Rotorua 94 2265 10 64 24 117 1264 6 56 25 7 172 17 35 24
Wellington 42 1256 19 53 30 10 63 20 32 26 3 26 25 25 25
Nelson 60 1759 14 56 29 28 220 13 45 27 4 37 25 33 27
Westland 10 234 14 48 23 5 25 28 47 33
Canterbury 40 1232 14 74 31 8 54 16 30 25 3 29 25 25 25
Southland 40 1181 15 54 30 21 174 14 39 27 4 45 21 25 24
Overall 336 9519 10 74 29 219 2112 6 56 26 25 375 17 35 25