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

Table 2

Some soil characteristics in this study.

Soil series	Soil classification^/4	Soil depth (cm)	Particles (%)			Texture
			Sand	Silt	Clay
Nam Phong^/1	Grossarenic Haplustalfs	0–20	90.9	6.5	2.6	Sand
		20–40	90.9	6.5	2.6	Sand
		40–60	91.2	2.1	6.7	Sand
		60–80	91.2	2.1	6.7	Sand
		80–100	91.2	2.1	6.7	Sand
Khorat^/2	Typic (oxyaquic) Kandiustults	0–20	79.3	13.5	7.2	Loamy sand
		20–40	77.5	11.4	11.1	Sandy loam
		40–60	74.9	16.7	8.4	Sandy loam
		60–80	67.1	20.1	12.8	Sandy loam
		80–100	57.7	19.9	22.4	Sandy clay loam
Ubon^/2	Grossarenic Haplustalfs	0–20	72.6	19.4	8.0	Sandy loam
		20–40	69.2	18.0	12.8	Sandy loam
		40–60	61.5	22.5	16.0	Sandy loam
		60–80	65.0	21.4	13.6	Sandy loam
		80–100	59.2	21.0	19.5	Sandy loam
Roi Et^/2	Aeric Kandiaquults	0–20	73.9	16.9	9.2	Sandy loam
		20–40	74.9	12.3	12.8	Sandy loam
		40–60	75.5	11.3	13.2	Sandy loam
		60–80	70.8	13.6	15.6	Sandy loam
		80–100	66.3	12.3	12.4	Sandy loam
Satuk^/3	Typic Paleustults	0–20	80.1	0.7	19.2	Sandy loam
		20–40	N/A	N/A	N/A	N/A
		40–60	N/A	N/A	N/A	N/A
		60–80	N/A	N/A	N/A	N/A
		80–100	N/A	N/A	N/A	N/A

^/1Toung et al. [20]; ^/2Saenya et al. [21]; ^/3Kaweewong et al. [22]; ^/4Soil Survey Staff [23]. N/A: not available.