Table 4 Wilcoxon test for the difference between the soil organic carbon (SOC) of the arable lands (CORINE 2.1) in the 0–30 cm layer in 1994 (LEG-SOC94) and estimated SOC in 2008 (EST-SOC08) in the coinciding locations of the samples taken in 1994

Negative ranks (EST-SOC08 < LEG-SOC94)

73

123.6

9026

100.3

7320

Positive ranks (EST-SOC08 > LEG-SOC94)

229

160.4

36,727

167.8

38,433

Ties (EST-SOC08 = LEG-SOC94)

0

Test statistics based on positive ranks (Wilcoxon)

 Z based on negative ranks

− 9.119

− 10.243

 Asymptotic significance (2-tailed)

 < 0.001

 < 0.001