Predicting the water-use of Eucalyptus nitens plantations in ...

4. Comparison of Florentine and Forestier Results
Figure 12 is a plot of basal area and sapwood area of individual trees in the Florentine Valley
(aged > 5 years or < 5 years), and Forestier. The data were segregated according to age
because the ratio of sapwood to basal area changes after the canopy of the plantation closes at
around 5 years. The Forestier results fall within the cloud of data points generated in the
Florentine Valley, and the lines of best fit overlay each other. Statgraphics “Comparison of
regression lines” indicates that there is no significant difference between the two fitted
models (α=0.05). This result supports the use of the Florentine sapwood area model in other
locations or the inclusion of Forestier data in the Florentine model.
Sapwood Area (cm 2 )
300
250
200
150
100
50
0
y = 0.30x + 17.8
R² = 0.78
0 100 200 300 400 500 600 700 800
Basal Area (cm 2 )
Figure 12. Relationship between basal area and sapwood area for trees aged >5 years at
Florentine, aged 5years)