Genesis and Classification of Termite-Mediated Soils along Toposequences in a Semiarid Area of Southeast Ethiopia

Table 4

Selected soil physicochemical properties of the termite mounds (TM, n = 3, ± standard deviation) and reference pedons across toposequences in Ilala-Sara and Silala, southeast Ethiopia.

Horizons	Depth (cm)	Sand (>63 μm)	Silt (2–63 μm)	Clay (<2 μm)	Texture class	Silt : clay ratio	pH (1 : 2.5 H2O)	CCE (g kg^−1)	EC (mS cm^−1)	OC (g kg^−1)	Avail. P (mg kg^−1)	CEC (cmolc kg^−1)
		g kg^−1 of fine Earth
Pedon D01, Ilala-Sara, ∼ gently undulating summit
A	0–12	680	60	260	Sandy clay loam	0.23	5.74		1.49	12.48	4.81	5.20
AB	12–30	500	80	420	Sandy clay	0.19	5.95		1.83	13.26	4.26	10.00
Bw	30–73	440	120	440	Clay	0.27	5.49		1.29	11.70	9.17	10.60
BC	73–140	510	130	360	Sandy clay	0.36	5.92		1.34	8.780	8.62	9.00
Cr	140–200+	720	140	140	Sandy loam	1.0a0	6.06		1.99	6.630	5.57	6.00
TM	—	480 ± 1.15	140 ± 2.00	380 ± 2.31	Sandy clay	0.37	6.83 ± 0.31		13.21 ± 0.02	22.88 ± 0.24	9.13 ± 0.96	32.67 ± 2.19
Pedon D02, Ilala-Sara site, ∼ gently undulating back slope
A	0–7	780	80	140	Sandy loam	0.57	5.69		0.92	11.70	7.92	5.20
AB	7–95	580	80	340	Sandy clay loam	0.24	5.21		0.80	11.70	6.7	7.60
Bw	95–140	360	20	620	Clay	0.03	6.03		1.08	9.75	6.54	4.80
BC	140–170	480	60	460	Sandy clay	0.13	5.4		0.68	2.34	6.7	9.20
Cr	170–200+	540	100	360	Sandy clay	0.28	5.1		0.62	3.90	6.4	8.60
TM	—	527 ± 1.33	180 ± 2.00	293 ± 1.76	Sandy clay loam	0.61	6.28 ± 0.13		46.14 ± 0.17	20.41 ± 0.40	11.97 ± 1.11	28.67 ± 0.88
Pedon D03, Ilala-Sara site, ∼ nearly levelled toe slope
A	0–10	740	40	220	Sandy clay loam	0.18	5.82		1.20	12.48	6.38	7.80
AB	10–40	740	40	220	Sandy clay loam	0.18	5.73		0.87	10.53	9.17	6.20
Bg	40–70	660	100	240	Sandy clay loam	0.42	5.63		0.60	11.70	12.36	7.20
Bt	70–200+	340	140	520	Clay	0.27	5.95		1.27	9.36	10.69	26.40
Pedon M01, Silala site, ∼ very gentle foot slope
A	0–10	580	200	220	Sandy clay loam	0.91	6.68		2.11	16.38	5.02	9.20
AB	10–55	520	100	380	Sandy clay	0.26	6.01		0.80	12.09	3.22	9.80
Bt	55–90	380	140	480	Clay	0.29	6.42		0.82	7.80	2.8	14.20
Bo	90–200+	480	260	260	Sandy clay loam	1.00	7.22		2.34	7.80	4.39	17.40
TM	—	500 ± 1.16	167 ± 1.76	333 ± 2.67	Sandy clay loam	0.50	6.17 ± 0.12		14.09 ± 0.08	15.73 ± 0.19	13.19 ± 0.90	29 ± 3.22
Pedon M02, Silala site, ∼ levelled land surface
A	0–18	480	260	260	Sandy clay loam	1.00	7.60	265.00	3.66	23.40	5.78	14.20
AB	18–42	560	220	220	Sandy clay loam	1.00	7.39	525.00	3.76	19.50	6.89	10.00
Bk	42–70	480	240	280	Sandy clay loam	0.86	7.62	685.00	3.77	13.65	8.75	9.40
Ck	70–120	550	150	300	Sandy clay loam	0.50	7.79	680.00	3.97	14.43	9.63	8.20
Ckm	120–200+	740	40	220	Sandy clay loam	0.18	8.20	565.00	6.41	13.65	4.74	16.40
TM	—	353 ± 1.76	200 ± 0.00	447 ± 1.76	Clay	0.45	7.28 ± 0.31	663.33 ± 3.75	8.73 ± 0.04	21.58 ± 0.45	17.1 ± 1.05	28.33 ± 1.76