Land Use Changes Affecting Soil Organic Matter Accumulation in Topsoil and Subsoil in Northeast Thailand

Table 6

Means for soil organic matter content (Mg·ha^–1) in soil profiles averaged from four land use types and six locations.

Land use types	Soil depths
	1^a	2^b	5^c
Forest	192.80A (–)	96.43A (–)	38.57A (–)
Cassava	142.30C (–26%)	71.15C (–26%)	28.46B (–26%)
Sugarcane	172.40B (–11%)	86.24B (–11%)	34.49C (–11%)
Paddy	144.64C (–25%)	72.32C (–25%)	28.93C (–25%)
CV (%)	33.11	12.90	15.27

Means in the same column followed by the different uppercase letters are significantly different by LSD (). ^aOne soil depth (0–100 cm); ^btwo soil depths, including topsoil (0–20 cm) and subsoil (20–100 cm); ^cfive soil depths, including 0–20, 20–40, 40–60, 60–80, and 80–100 cm.