Soil erosion affects variations of soil organic carbon and soil respiration along a slope in Northeast China

Ecological Processes

Table 1 Significant correlations. Pearson correlation coefficients of linear regressions (r) between the soil depth, soil redistribution rate, and SOC parameters. Single and double asterisks indicate the significance levels at p < 0.05 and p < 0.01, respectively

	Variable 1	Variable 2	r
Field measurement	SOC concentration	¹³⁷Cs activity Bq kg⁻¹	0.67**
	SOC concentration	Soil redistribution rate	0.85**
	SOC stock kg m⁻²	¹³⁷Cs inventory Bq m^− 2	0.96*
	SOC stock kg m⁻²	Soil redistribution rate	0.94*
	Fast Pool C (% of total SOC)	Soil depth	− 0.56*
	Passive pool C (% of total SOC)	Soil depth	0.56*
	Intermediate pool C (% of total SOC)	Soil redistribution rate	0.74*
	Microaggregate C (% of total SOC)	Soil redistribution rate	0.67*
Incubation study	Respiration μg C h⁻¹ g Soil⁻¹	SOC concentration	0.88**
	Respiration μg C h⁻¹ g Soil⁻¹	Soil depth	− 0.63**
	Respiration μg C h⁻¹ g SOC⁻¹	Soil depth	− 0.58**
	Subsoil respiration per SOC	Intermediate Pool C (% of total SOC)	− 0.65*
	Subsoil respiration per SOC	Microaggregate C (% of total SOC)	− 0.63*