TABLE 2.

Physical and geochemical characteristics of soil aggregates from the A, B, unsaturated (C-u), and saturated (C-s) C soil horizons

Horizon	Particle size (%)			Water content (g g−1)	pH	%					mg kg−1		mol% Feb
	Sand	Silt	Clay			Organic C	Inorganic C	Na	P	S	Fe	Mn	Ferrihydrite	Goethite	Ferrosmectite	Hornblende
A	22	46	32	0.33	5.3	3.13	1.02	0.31	0.08	0.05	33,000	2,800	51	30	0	19
B	31	50	19	0.20	4.5	0.14	0.12	0.03	0.06	0.01	48,300	252	40	31	9	20
C-u	50	36	14	0.21	5.1	0.06	0.14	0.01	0.13	NDc	35,100	670	33	22	16	29
C-s	42	30	28	0.33	6.9	0.10	0.01	0.02	0.10	0.02	39,200	1,260	28	33	15	24

^aNH₄ was below the detection limit (<0.01%).

^bExtended X-ray absorption fine structure = ±5%.

^cND, not detected.