Short-Term Effects of Tillage Practices on Soil Organic Carbon Turnover Assessed by δ¹³C Abundance in Particle-Size Fractions of Black Soils from Northeast China

Table 1

δ ¹³C abundances, C₃–C and C₄–C fractions in the plough layer of Black soil under no tillage (NT) and mouldboard plough (MP) in 2006.

	Treatments	δ ^13C (‰)	𝑓 (%)	1−𝑓 (%)	C4–C (g kg^−1)	C3–C (g kg^−1)
0–10 cm
Coarse POC	NT	−19.8	32.2	67.8	0.48	0.83
	MP	−20.2	32.1	67.9	0.27	0.58
Fine POC	NT	−19.3	40.8	59.2	0.32	0.47
	MP	−19.2	41.2	58.8	0.43	0.60
Silt plus clay OC	NT	−21.1	27.4	72.6	4.00	10.6
	MP	−21.1	27.2	72.8	4.10	11.0
10–20 cm
Coarse POC	NT	−20.8	25.3	74.7	0.10	0.29
	MP	−20.7	25.8	74.2	0.12	0.34
Fine POC	NT	−19.5	30.4	69.6	0.14	0.33
	MP	−19.8	27.3	72.7	0.26	0.63
Silt plus clay OC	NT	−21.1	16.1	83.9	2.34	12.1
	MP	−21.1	17.1	82.9	2.54	12.4