Teak (Tectona grandis Linn. f) and Edaphic Factors Affecting the Regeneration of Woody Species and Their Functional Traits in Economic Forest Plantation, Northern Thailand

Table 3

Teak diameter at breast height (DBH, cm), basal area (BA, m² ha⁻¹), stem density (D, stems ha⁻¹), and height (H, m) in teak plantations and old-growth forest sites in Khun Mae Khum Mee plantations.

Teak value	10-year-old	20-year-old	30-year-old	40-year-old	Old-growth forest	Sig.
DBH	12.44 ± 1.58^c	15.13 ± 2.19^bc	18.11 ± 5.89^b	24.91 ± 4.84^a	8.13 ± 6.68^d
BA	6.77 ± 2.66^b	7.23 ± 2.05^b	4.81 ± 2.25^b	10.85 ± 4.29^a	0.73 ± 0.82^c
D	477.50 ± 88.55^a	362.50 ± 87.60^b	175 ± 107.37^c	202.50 ± 58.27^c	67.50 ± 70.76^d
H	12.01 ± 1.43^cd	17.08 ± 2.77^b	14.91 ± 3.91^bc	23.85 ± 3.31^a	9.08 ± 7.37^d

Different lowercase letters within a row indicate significantly different means by Tukey’s test (one-way ANOVA, ; n = 50). Values are expressed as mean ± SD; .