Micromorphological and Chemical Approaches to Understand Changes in Ecological Functions of Metal-Impacted Soils under Various Land Uses

Table 2

Selected soil properties and pseudototal metals concentration of the A and C horizons of soils under various land uses in Cartagena (SE Spain).

Sites	Industrial			Urban		Natural		Agricultural		Local background
horizons	A	C1	C2	A	C	A	C	A	C
pH H2O	7.5	7.6	7.5	7.2	7.5	7.1	7.7	7.9	7.9
pH CaCl2	7.1	7.4	7.3	7	7.3	6.7	7.1	7.1	7.1
E.C. (ds/m)	2.7	5.7	4.3	2.7	2.3	0.8	0.3	0.5	0.5
CaCO3 (%)	32.7	43.6	28.1	23.7	21.9	60.6	68.6	24.8	29.7
O.C. (%)	0.61	0.27	0.56	3.13	0.88	2.64	1.15	1.34	1.07
T.N. (%)	0.05	0.02	0.05	0.24	0.06	0.21	0.1	0.11	0.1
C/N	12.2	13.5	11.2	13.1	14.6	12.6	11.5	12.2	10.1
CEC (cmokg^-1)	7.9	7.6	11.2	13.8	7.7	6.9	8.2	12.5	14.3
Clay (%)	11.8	24.3	14.1	17.3	11.6	39.4	47.1	29	25.6
Silt (%)	61.3	55.2	57.2	43.2	40.6	49.5	40.8	50.7	55
Fe (mg kg^-1)	20831	19696	19195	26444	25080	14999	12554	24827	24520	—
Mn (mg kg^-1)	338	319	244	449	396	283	221	450	444	—
Zn (mg kg^-1)	1002	796	65	523	163	212	143	342	331	41.4
Cu (mg kg^-1)	28.1	19.6	17.1	48	46.9	15.1	13.9	23.6	17.9	12.6
Pb (mg kg^-1)	58.2	103.2	8.5	411.1	400.7	248.8	179.8	128.3	88.1	9.3
Cd (mg kg^-1)	4.1	2.6	0.2	3	0.5	3.4	0.8	3.7	3.8	0.32

E.C.: electrical conductivity; O.C.: organic carbon; T.N.: total nitrogen; C.E.C.: cation exchange capacity.