Validating the regional estimates of changes in soil organic carbon by using the data from paired-sites: the case study of Mediterranean arable lands

Table 3 Descriptive statistics and main quantiles of each of the dataset used in the present study

	SOC94	SOC17	log of SOC94	log of SOC17	LEG-SOC94 (measured)	EST-SOC08 (estimated)^b	log of LEG-SOC94 (measured)	log of EST-SOC08 (estimated)^b
Mean^a	1.31	1.23	0.00550	0.03800	1.01	1.38	− 0.06983	0.12939
Standard deviation	0.96	0.67	0.33708	0.20808	0.59	0.39	0.26742	0.10394
Variance	0.93	0.45	0.11362	0.04330	0.35	0.15	0.07151	0.01080
Kurtosis	3.55	3.28	1.22	0.52	4.40	3.10	0.57	0.96
Skewness	1.76	1.78	− 0.69	0.36	1.53	1.79	− 0.55	1.23
n	30	30	30	30	302	302	302	302
Quantiles
Min	0.120	0.400	− 0.9208	− 0.3979	0.100	0.953	− 1.000	− 0.021
0.010	0.149	0.429	− 0.8445	− 0.3698	0.150	1.001	− 0.824	0.000
0.025	0.193	0.473	− 0.7300	− 0.3277	0.215	1.012	− 0.667	0.005
0.050	0.270	0.545	− 0.5783	− 0.2654	0.300	1.027	− 0.523	0.012
0.250	0.780	0.803	− 0.1079	− 0.0956	0.560	1.142	− 0.252	0.058
0.500	1.050	1.100	0.0205	0.0414	0.945	1.253	− 0.025	0.098
0.750	1.633	1.353	0.2128	0.1310	1.328	1.487	0.123	0.172
0.950	3.343	2.830	0.5240	0.4493	2.099	2.219	0.322	0.346
0.975	3.699	3.128	0.5648	0.4952	2.260	2.477	0.354	0.394
0.990	4.156	3.171	0.6155	0.5012	2.820	2.773	0.450	0.443
Max	4.460	3.200	0.6493	0.5051	4.330	2.969	0.636	0.473

^afor logs, mean of log represent the arithmetic mean of the logarithms₁₀ of the SOC values expressed in %
^bsuch an estimation is from the 302 sites in which a measure was available 1994 and applying the 1-km resolution estimation process used in the 2008 described in [56]

ISSN: 1750-0680