Table 6. Contents of soil organic carbon and black carbon as well as respective contributions and soil color expressed as lightness (L*) in the pit fillings, adjacent subsoils, recent topsoils and Early Weichselian humic zone.

Region/excavation site	Sample type	na	Corg		BC		BC-C		Color		B3CA		B4CA		B5CA		B6CA
			[g kg−1]		[g kg−1 soil]		[% of Corg]		L*		[% of total BC]
Central Germany
Chernozem region	pit filling	6	8.5	(0.5) a	2.2	(0.3) a	25.2	(2.1) a	52	(1.5) ab	3.5	(0.3) a	20.1	(0.6) a	36.5	(1.1) a	39.9	(0.9) a
	subsoil	6	5.3	(0.8) a	0.6	(0.3) a	10.0	(2.8) a	61	(2.5) a	20.2	(16.0) a	34.0	(7.9) a	21.8	(4.7) b	24.0	(5.5) b
	topsoil	5	13.0	(1.8) b	2.4	(0.4) a	19.8	(2.7) a	47	(1.5) b	3.8	(0.3) a	20.3	(2.0) a	35.0	(1.0) ab	40.9	(2.2) a
Phaeozem region	pit filling	2	5.7	(1.8) ab	1.1	(0.1) a	29.1	(2.3) a	53	(2.4) ab	4.6	(0.3) a	24.2	(2.2) a	35.7	(1.0) a	35.6	(3.5) a
	subsoil	2	3.5	(1.0) a	0.2	(0.1) a	7.5	(5.2) a	64	(0.3) a	5.3	(0.2) a	42.0	(6.8) a	29.6	(8.5) a	23.1	(1.5) a
	topsoil	1	11.9	b	0.3	a	7.7	a	58	b	3.4	a	24.9	a	32.9	a	38.8	a
Western Germany
Luvisol region	pit filling	11	4.1	(0.5) a	1.6	(0.2) a	36.6	(4.2) a	54	(0.8) a	4.5	(0.3) a	26.5	(1.7) a	35.2	(1.4) a	33.7	(1.0) a
	subsoil	13	3.5	(0.5) a	0.3	(0.1) b	8.7	(2.9) b	57	(0.5) b	2.7	(0.2) b	38.2	(2.9) a	29.8	(1.9) a	29.3	(1.0) b
	topsoil	2	14.2	(5.0) b	1.4	(0.3) a	10.4	(1.9) b	55	(1.1) a	3.5	(0.4) b	20.6	(1.0) b	32.1	(3.8) a	43.8	(2.4) c
Düren Arnoldsweiler	humic zone	1	2.4		0.5		22.7		62		3.7		37.0		28.9		30.4

Means with the standard errors in parentheses. Within one region, different letters designate significant (p<0.05) differences between sample types.

^anumber of samples;

^bin 0.01 M CaCl₂.