Leaf Area and Structural Changes after Thinning in Even-Aged Picea rubens and Abies balsamea Stands in Maine, USA
Table 1
Mean (standard deviation) and sample size by treatment type and thinning history for pre- and postthinning leaf area index (LAI) and relative densitya (RD).
Thinning treatment
Prethinning
RD
Postthinning
RD
Number of plots
LAI (m2 m−2)
LAI (m2 m−2)
NOPCT
Crown 33%
10.7 (2.3)
0.59 (0.06)
6.4 (1.9)
0.35 (0.02)
6
Crown 50%
10.9 (2.8)
0.61 (0.09)
5.1 (1.2)
0.28 (0.02)
6
Dominant 33%
10.7 (1.8)
0.59 (0.05)
5.9 (1.9)
0.34 (0.06)
6
Dominant 50%
11.0 (3.3)
0.58 (0.09)
4.2 (1.4)
0.26 (0.05)
6
Low 33%
9.8 (1.7)
0.59 (0.09)
7.2 (1.9)
0.36 (0.05)
6
Low 50%
10.2 (2.2)
0.59 (0.04)
5.8 (1.7)
0.28 (0.05)
6
Control
9.7 (1.7)
0.60 (0.09)
10.9 (2.1)
0.69 (0.12)
6
PCT
33% Reduction
12.2 (0.9)
0.36 (0.03)
7.8 (0.7)
0.24 (0.02)
6
50% Reduction
10.1 (1.3)
0.31 (0.05)
4.9 (0.6)
0.15 (0.02)
6
Control
10.4 (1.7)
0.31 (0.05)
11.6 (1.9)
0.36 (0.05)
30
aRelative density calculated according to Wilson et al. [34]. Note: PCT—precommercial thinning history, NOPCT—no history of precommercial thinning.
