Table 3. Carbon contents by soil depth in six differently aged Mytilaria laosensis plantation stands (values are means ±SE, n = 12; g kg⁻¹).

Soil depth (cm)	7 yr old	10 yr old	18 yr old	23 yr old	29 yr old	33 yr old	Mean
0–10	28.1±4.2A	27.4±2.8A	29.6±2.9 A	31.7±2.4AB	39.7±4.3C	47.1±5.7D	33.9±3.4
10–30	23.2±2.7A	24.7±2.1A	26.3±1.7B	26.6±2.3B	27.7±1.8B	31.0±2.5C	26.6±2.4
30–50	18.9±2.4A	19.4±2.7A	18.6±1.9A	19.0±2.6A	19.4±3.1A	20.5±3.4A	19.3±3.0
50–100	10.9±1.5A	11.3±1.7A	13.2±2.3B	12.8±2.0B	14.4±2.4C	15.4±2.7C	13.0±2.3
Mean	20.3±2.5	20.7±2.3	21.9±2.7	22.5±2.4	25.3±3.2	28.5±3.7	23.2±2.7

Note: Different capital letters indicate significant pairwise differences within soil depths between stand ages (multiple comparisons test; P<0.05).