Physicochemical Properties and Surface Charge Characteristics of Arid Soils in Southeastern Iran

Table 4

Relative abundance of clay mineral and some electrochemical characteristics of the soils studied.

Soil number	Depth (cm)	Chl	Sme	Pal	Ill	Kao	Sep	Ill-Sme	pH0	δpH (KCl−H2O)	δpH (pH0−CaCl2)	𝜎𝑝 (cmolckg^−1)	𝜎max (cmolckg^−1)
		%
1	0–25	17	8	38	16	13	—	<8	3.35	−0.19	−4.65	−38	−48
	25–78	15	13	37	11	24	—	—	3.20	−0.21	−4.40	−27.3	−35
	78–110	22	18	35	7	18	—	—	3.30	−0.18	−4.25	−35.7	−43
	100–150	20	22	31	5	22	—	—	3.20	−0.25	−4.50	−29.2	−38.9
2	0–20	16	16	25	18	25	—	—	3.15	−0.17	−4.70	−21.2	−29.5
	20–50	37	22	24	12	5	—	—	2.90	−0.17	−5.00	−19.1	−27
	50–100	31	25	18	8	8	—	<10	3.00	−0.22	−4.80	−14.3	−22
	100–150	30	29	17	7	9	—	<8	2.80	−0.20	−5.10	−15.4	−22.7
3	0–30	10	15	33	26	6	—	<10	3.00	−0.20	−4.75	−22.1	−32
	30–80	21	21	30	20	8	—	—	3.15	−0.19	−4.69	−29.7	−41
	80–150	11	26	29	15	7	—	<12	3.10	−0.21	−4.46	−31.8	−42
4	0–20	23	8	16	35	8	5	<5	2.95	−0.14	−4.90	−18.1	−34
	20–70	20	14	14	24	18	10	—	2.87	−0.10	−5.06	−11.2	−25.5
	70–95	36	16	10	20	9	9	—	3.20	−0.17	−4.60	−13.2	−22
	95–150	27	20	9	15	9	8	<12	3.14	−0.11	−4.80	−17.2	−20.9
5	0–45	18	15	14	33	7	—	<13	3.11	−0.16	−4.64	−15.9	−24.1
	45–150	25	24	21	30	—	—	—	3.25	−0.19	−4.65	−14.2	−22.4
6	0–42	20	15	23	30	7	5	—	3.01	−0.19	−4.77	−24.5	−32
	42–88	19	21	15	24	8	8	<5	2.87	−0.22	−5.03	−20.1	−28.9
	88–150	25	25	12	20	9	9	—	2.90	−0.19	−4.99	−24.3	−32.5
7	0–36	28	14	32	26	—	—	Tr	3.15	−0.24	−4.38	−25.3	−35
	36–86	24	20	30	20	6	—	—	3.10	−0.23	−4.70	−23.4	−32
	86–150	19	26	18	17	9	11	Tr	3.15	−0.18	−4.54	−24.3	−34
8	0–30	30	18	27	25	—	—	—	3.17	−0.15	−4.63	−17.3	−24
	30–70	33	26	23	18	—	—	—	3.10	−0.06	−4.75	−19.2	−25.5
	70–150	34	30	20	16	—	—	—	2.98	−0.07	−4.83	−18.4	−23.8

Chl: chlorite, Sme: smectite, Pal: palygorskite, Ill: illite, Kao: kaolinite, Sep: sepiolite, Ill-Sme: illite-smectite.