Land use change and forest management effects on soil carbon stocks in the Northeast U.S.

Table 1 Meta-analysis results for potential predictors of C stock changes during post-agricultural reforestation

Organic horizons				Mineral soils (all horizons)
Factor	Qb (Qm)	Qt	P	Factor	Qb (Qm)	Qt	P
Study identity	953.7	1800	< 0.001	Study identity	4.5	18.9	0.72
Previous land use	136.7	1800	< 0.001	Previous land use	0.1	18.9	0.71
Stand-level forest type group	684.4	1800	< 0.001	Stand-level forest type group	0.5	18.9	0.78
Stand-level forest type	885.6	1800	< 0.001	Stand-level forest type	2.2	18.9	0.83
Ecoprovince	847.3	1800	< 0.001	Ecoprovince	1.1	18.9	0.77
Ecosection	847.3	1800	< 0.001	Ecosection	1.2	18.9	0.88
Ecosubsection	953.7	1800	< 0.001	Ecosubsection	1.8	18.9	0.94
Mean annual temperature	586.6	1800	< 0.001	Mean annual temperature	0.0	18.9	1.00
Mean annual precipitation	90.3	1800	< 0.001	Mean annual precipitation	0.0	18.9	0.95
Elevation	465.4	1800	< 0.001	Elevation	0.0	18.9	0.87
Slope steepness group	556.4	1800	< 0.001	Slope steepness group	0.4	18.9	0.83
Aspect class	516.8	1800	< 0.001	Aspect class	1.0	18.8	0.60
Landform group	614.0	1800	< 0.001	Landform group	0.8	18.9	0.94
Parent material	410.1	1800	< 0.001	Parent material	0.2	18.9	0.90
Surface geology	614.0	1800	< 0.001	Surface geology	0.9	18.8	0.82
Soil Order	827.2	1800	< 0.001	Soil Order	1.0	18.6	0.60
Soil Suborder	856.5	1800	< 0.001	Soil Suborder	1.4	18.3	0.85
Soil Great Group	953.7	1800	< 0.001	Soil Great Group	2.9	16.7	0.71
Soil Subgroup	953.7	1800	< 0.001	Soil Subgroup	2.9	16.7	0.71
Organic subhorizon	200.1	1800	< 0.001	Soil master horizon	1.6	18.9	0.80
				Soil texture	2.9	18.8	0.89
Wetness group	827.2	1800	< 0.001	Wetness group	2.0	18.9	0.57
Drainage index	510.1	1800	< 0.001	Drainage index	0.9	18.9	0.36
Productivity index	465.8	1800	< 0.001	Productivity index	0.1	18.9	0.80

Statistics include the between-group (Q_b) or continuous model (Q_m) heterogeneity, total heterogeneity (Q_t), and P value for each predictor variable

ISSN: 1750-0680