Table 1 Soil carbon accumulation.

Months	Substrate added	SOC(mg C per g soil)
		Kaolinite			Montmorillonite				Field soil
		Glucose	Cellobiose	DOC	Glucose	Cellobiose	Syringol	DOC
6	16.80	5.10^Ab	5.33^Ab	6.21^Bb	4.01^Aa	3.91^Aa	7.96^C	5.55^Ba	9.18±0.04^*
9	27.30	7.21^Ab	6.55^Aa	8.54^Ba	6.2^Aa	6.72^Aa	14.36^C	8.83^Ba
12	37.10	8.05^Aa	9.21^Ba	11.10^Ca	7.76^Aa	8.86^Aa	12.98^B	10.73^Ba
15	46.90	11.08^Aa	11.33^Aa	12.88^Bb	10.43^Aa	10.17^Aa	14.47^C	11.98^Ba
18	46.90	8.61^Aa	8.88^Aa	10.45^Ba	8.36^Aa	7.98^Aa	13.11^B	11.75^Bb
Amount lost		38.29	38.02	36.45	38.54	38.92	33.79	35.20
		SOC conversion efficiency (mg SOC per g total substrate-C added)
6	16.80	0.30^Ab	0.32^Ab	0.37^Bb	0.24^Aa	0.23^Aa	0.47^C	0.33^Ba	0.03–0.33^†
9	27.30	0.26^Ab	0.24^Ba	0.31^Ca	0.23^Aa	0.29^Aa	0.49^C	0.32^Ba
12	37.10	0.22^Aa	0.25^Ba	0.30^Ca	0.21^Aa	0.24^ABa	0.35^B	0.29^Ba
15	46.90	0.24^Aa	0.24^Aa	0.27^Bb	0.24^Aa	0.23^Aa	0.47^C	0.26^Ba
18	46.90	0.18^Aa	0.19^Aa	0.22^Ba	0.18^Aa	0.10^Aa	0.28^B	0.25^Bb
Fraction lost		0.82	0.81	0.78	0.82	0.90	0.72	0.75

The soil organic carbon (SOC) concentration and conversion efficiency (the proportion of added substrate-C converted to SOC) at 6, 9, 12, 15 and 18 months in soils treated with glucose, cellobiose, syringol or plant leachate DOC. For comparison, field soil results are also presented. Significance among substrates within clay type is indicated by capital letters. Significant pair-wise comparisons among clay types within a substrate group is indicated by lowercase letters (ANOVA: P<0.05) (experimental replication n=5). DOC, dissolved organic C.
^*Soybean bulk soils 0–7 cm depth, collected from the W.K. Kellogg Biological Station, Michigan¹⁶.
^†Data synthesized from 15 field and laboratory incubation experiments⁷.

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