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All issues Volume 67 / No 1 (January-February 2010) Ann. For. Sci., 67 1 (2010) 105 Full HTML
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Table II

Predicting individual seedling height and diameter growth for the four species and for four growth periods: model predictive ability (adj-R2) and coefficient estimates.

Model coefficients
Increment Species Growth k value n Adj-R2 Intercept Initial size Treatment Initial size
period × treatment
Diameter A. pseudoplatanus 04–07 1 1668 0.53 051 0.75 –0.032 n.s. –0.68
04–05 2 1806 0.20 0.85 0.14 –0.046 n.s. –0.13
05–06 2 1712 0.41 0.42 0.46 0.46 n.s. –0.47
06–07 2 1668 0.54 0.59 0.42 0.18 –0.41
A. platanoides 04–07 1 280 0.36 0.97 0.61 –0.13 n.s. –0.56
04–05 2 292 0.24 1.01 0.14 –0.10 –0.17
05–06 2 287 0.20 0.43 0.53 0.56 –0.55
06–07 2 280 0.47 0.64 0.46 0.18 –0.44
A. campestre 04–07 1 586 0.33 0.93 0.31 –0.21 –0.42
04–05 2 641 0.14 0.96 0.034 n.s. –0.096 0.071
05–06 2 596 0.09 0.66 0.24 0.29 –0.32
06–07 2 586 0.39 0.91 0.16 –0.12 –0.17
F. sylvatica 04–07 1 215 0.78 1.29 0.50 –0.88 –0.11 n.s.
04–05 2 223 0.55 1.03 0.18 –0.28 –0.072 n.s.
05–06 2 216 0.52 0.72 0.36 0.10 n.s. –0.28
06–07 2 215 0.64 0.55 0.49 0.064 n.s. –0.30
Height A. pseudoplatanus 04–07 37 1668 0.44 2.89 0.38 0.63 –0.32
04–05 51 1806 0.01 3.93 0.0097 –0.024 n.s. 0.0028 n.s.
05–06 40 1712 0.20 3.43 0.13 0.28 –0.13
06–07 37 1668 0.62 2.68 0.37 0.86 –0.34
A. platanoides 04–07 37 280 0.670 2.58 0.64 1.07 –0.59
04–05 51 292 0.45 3.70 0.12 0.25 –0.13
05–06 40 287 0.70 2.99 0.34 0.70 –0.32
06–07 37 280 0.78 2.71 0.40 0.78 –0.32
A. campestre 04–07 37 586 0.34 3.33 0.26 0.33 –0.22
04–05 51 641 0.04 4.04 –0.038 –0.11 0.043
05–06 40 596 0.27 3.47 0.14 0.24 –0.13
06–07 37 586 0.57 3.06 0.27 0.49 –0.22
F. sylvatica 04–07 37 215 0.21 4.15 0.047 n.s. –0.57 n.s. 0.017 n.s.
04–05 51 223 0.01 4.01 –0.016 n.s. –0.28 n.s. 0.073 n.s.
05–06 40 216 0.30 3.72 0.064 –0.064 n.s. –0.029 n.s.
06–07 37 215 0.53 3.57 0.13 –0.027 n.s. –0.090 n.s.

Tested model: log(growth + k) = log(initialsize) + treat + log(initialsize)·treatwhere growth refers to diameter or height growth over the growth period, initial size to diameter or height at the beginning of the growth period, treat to treatment (treat = 0 for G and treat = 1 for C). All models presented are statistically significant (p < 0.05). All coefficient estimates presented are significantly different from 0 (p < 0.05), unless otherwise specified (n.s.).