Effects of Soil Compaction and Relative Light Intensity on Survival and Growth Performance of Planted Shorea macrophylla (de Vriese) in Riparian Forest along Kayan Ulu River, Sarawak, Malaysia
Table 3
Comparison of soil penetration resistance at 0-100 cm depth in plot aged 20 years (SPD96), plot aged 19 years (SPD97), plot aged 18 years (SPD98), and plot aged 17 years (SPD99).
Soil Penetration Resistance (J cm-1)
Depth (cm)
0-10
10-20
20-30
30-40
40-50
50-60
60-70
70-80
80-90
90-100
Study Sites
SPD96
2.5 ± 0.1a
4.3 ± 0.2ns
5.7 ± 0.4a
6.9 ± 0.7ns
8.6 ± 0.7ns
11.3 ± 0.9ns
14.7 ± 2.2ns
19.3 ± 3.0ns
21.1 ± 3.1ns
24.7 ± 3.6ns
SPD97
2.5 ± 0.2a
4.3 ± 0.4ns
6.6 ± 0.4ab
8.3 ± 0.4ns
9.5 ± 0.4ns
11.4 ± 0.5ns
13.7 ± 0.8ns
15.7 ± 1.1ns
18.0 ± 1.4ns
21.6 ± 1.8ns
SPD98
3.7 ± 0.4b
5.3 ± 0.6ns
7.8 ± 0.5b
8.6 ± 0.5ns
9.0 ± 0.6ns
10.0 ± 0.8ns
11.3 ± 1.0ns
13.2 ± 1.8ns
16.2 ± 1.9ns
20.4 ± 2.6ns
SPD99
3.4 ± 0.3ab
5.3 ± 0.2ns
7.1 ± 0.4ab
8.7 ± 0.5ns
10.3 ± 0.7ns
11.4 ± 0.9ns
14.9 ± 1.3ns
18.7 ± 1.6ns
23.7 ± 2.2ns
29.8 ± 3.2ns
Means ± standard error: values in the same column followed by different letters indicate significant differences among sites at P < 0.05 using Tukey’s test; ns: no significant differences.