. 2014 Mar 27;4:4460. doi: 10.1038/srep04460

Table 2. Pearson correlation coefficients between the soil organic carbon response ratio and other factors.

Conversion type	Soil layer	SOC_in	MAT	MAP	N
Total	0–20 cm	−0.171^**	0.046	−0.020	411
	20–40 cm	−0.205^*	−0.037	−0.057	134
	40–60 cm	−0.294^*	0.290	0.315	59
CCF	0–20 cm	−0.212^**	−0.020	−0.116	247
	20–40 cm	−0.220^*	−0.111	−0.088	96
	40–60 cm	−0.278	0.270	0.277	46
CCG	0–20 cm	−0.136	0.088	0.089	164
	20–40 cm	−0.112	−0.129	−0.184	38
	40–60 cm	−0.293	−0.082	−0.024	13

CCF: Conversion of cropland to forest; CCG: conversion of cropland to grassland; SOC_in: initial soil organic carbon content in cropland; MAT: mean annual temperature; MAP: mean annual precipitation; N: number of samples.

*p < 0.05; **p < 0.01.