## 3 Results
The enzymatic activities measured in soils collected in different seasons under the same vegetation cover are reported in Figure 1.  
The hydrolase (HA) activity ranged from 187 to 2544 mmol FDA g\({}^{-1}\) d.w. h\({}^{-1}\) in soils covered by pine (P), from 285 to 1842 mmol FDA g\({}^{-1}\) d.w. h\({}^{-1}\) in soils covered by holm oak (HO), from 109 to 1275 mmol FDA g\({}^{-1}\) d.w. h\({}^{-1}\) in soils covered by black locust (BL), and from 36.2 to 1377 mmol FDA g\({}^{-1}\) d.w. h\({}^{-1}\) in soils covered by herbs (H). HA did not significantly vary among seasons in soils under P and H (Figure 1); whereas, it was statistically higher in summer and winter in soils covered by HO and statistically lower in spring in soils covered by BL (Figure 1). \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline  & \multicolumn{2}{c}{**P**} & \multicolumn{2}{c}{**HO**} & \multicolumn{2}{c}{**BL**} & \multicolumn{2}{c}{**H**} \\ \hline  & **UB** & **B** & **UB** & **B** & **UB** & **B** & **UB** & **B** \\ \hline \multirow{2}{*}{**pH**} & 7.48 & 7.43 & 7.43 & 7.21 & 7.08 & 7.03 & 7.58 \(a\) & 7.27 \(b\) \\  & \(\pm 0.17\) & \(\pm 0.12\) & \(\pm 0.15\) & \(\pm 0.14\) & \(\pm 0.05\) & \(\pm 0.08\) & \(\pm 0.06\) & \(\pm 0.05\) \\ \hline \multirow{2}{*}{**WC**} & 11.5 & 11.2 & 34.7 & 25.1 & 10 & 8.96 & 11.9 & 5.34 \\  & \(\pm 2.19\) & \(\pm 1.61\) & \(\pm 4.36\) & \(\pm 4.12\) & \(\pm 2.23\) & \(\pm 1.73\) & \(\pm 3.75\) & \(\pm 1.36\) \\ \hline \multirow{2}{*}{**C**} & 3.03 & 2.98 & 9.47 & 5.69 & 3.35 & 5.43 & 2.79 & 1.25 \\  & \(\pm 0.32\) & \(\pm 0.26\) & \(\pm 1.32\) & \(\pm 1.13\) & \(\pm 0.65\) & \(\pm 1.34\) & \(\pm 0.98\) & \(\pm 0.49\) \\ \hline \multirow{2}{*}{**N**} & 0.15 & 0.20 & 0.61 & 0.39 & 0.66 & 0.74 & 0.25 & 0.14 \\  & \(\pm 0.03\) & \(\pm 0.02\) & \(\pm 0.09\) & \(\pm 0.04\) & \(\pm 0.34\) & \(\pm 0.24\) & \(\pm 0.07\) & \(\pm 0.02\) \\ \hline \multirow{2}{*}{**OM**} & 3.49 & 4.75 & 5.04 & 6.86 & 10.4 & 11.2 & 8.18 & 6.88 \\  & \(\pm 0.58\) & \(\pm 1.28\) & \(\pm 0.74\) & \(\pm 0.45\) & \(\pm 2.11\) & \(\pm 2.06\) & \(\pm 1.52\) & \(\pm 0.93\) \\ \hline \multirow{2}{*}{**Al**} & 14.6 & 14.5 & 11.8 \(b\) & 28.2 \(a\) & 11.2 & 13.2 & 4.75 & 8.13 \\  & \(\pm 3.81\) & \(\pm 2.30\) & \(\pm 3.29\) & \(\pm 9.69\) & \(\pm 2.19\) & \(\pm 1.95\) & \(\pm 0.76\) & \(\pm 1.65\) \\ \hline \multirow{2}{*}{**Ca**} & 3832 & 4146 & 13,090 \(a\) & 6985 \(b\) & 5937 & 4969 & 6831 & 3420 \\  & \(\pm 772\) & \(\pm 542\) & \(\pm 1553\) & \(\pm 1139\) & \(\pm 1095\) & \(\pm 1052\) & \(\pm 2485\) & \(\pm 1533\) \\ \hline \multirow{2}{*}{**Cu**} & 1.49 & 1.63 & 1.41 & 1.63 & 1.98 & 1.89 & 1.73 & 1.62 \\  & \(\pm 0.33\) & \(\pm 0.26\) & \(\pm 0.20\) & \(\pm 0.35\) & \(\pm 0.44\) & \(\pm 0.56\) & \(\pm 0.34\) & \(\pm 0.42\) \\ \hline \multirow{2}{*}{**Fe**} & 18.4 & 27.3 & 59.9 & 55.2 & 25.5 & 19.7 & 18.3 & 7.52 \\  & \(\pm 4.76\) & \(\pm 3.75\) & \(\pm 9.05\) & \(\pm 12.4\) & \(\pm 7.70\) & \(\pm 3.19\) & \(\pm 6.37\) & \(\pm 1.38\) \\ \hline \multirow{2}{*}{**K**} & 248 & 383 & 726 & 582 & 361 & 331 & 666 \(a\) & 278 \(b\) \\  & \(\pm 23.6\) & \(\pm 35.4\) & \(\pm 59.5\) & \(\pm 37.4\) & \(\pm 23.9\) & \(\pm 38.7\) & \(\pm 150\) & \(\pm 56.0\) \\ \hline \multirow{2}{*}{**Mg**} & 206 & 254 & 546 & 393 & 297 & 298 & 221 & 175 \\  & \(\pm 80.3\) & \(\pm 40.9\) & \(\pm 120\) & \(\pm 93.5\) & \(\pm 81.4\) & \(\pm 66.5\) & \(\pm 65.1\) & \(\pm 72.8\) \\ \hline \multirow{2}{*}{**Mn**} & 2.29 & 3.29 & 16.8 & 13.1 & 5.31 & 5.89 & 2.31 & 0.49 \\  & \(\pm 0.56\) & \(\pm 0.41\) & \(\pm 3.64\) & \(\pm 3.36\) & \(\pm 1.4\) & \(\pm 1.31\) & \(\pm 1.14\) & \(\pm 0.09\) \\ \hline \multirow{2}{*}{**Na**} & 789 & 762 & 939 & 880 & 874 & 849 & 977 & 811 \\  & \(\pm 119\) & \(\pm 59.3\) & \(\pm 55.9\) & \(\pm 90.7\) & \(\pm 97.1\) & \(\pm 66.6\) & \(\pm 119\) & \(\pm 87.7\) \\ \hline \multirow{2}{*}{**Pb**} & 1.69 & 2.05 & 3.35 & 2.39 & 2.91 & 2.86 & 1.37 & 2.72 \\  & \(\pm 0.37\) & \(\pm 0.37\) & \(\pm 0.61\) & \(\pm 0.74\) & \(\pm 1.31\) & \(\pm 1.46\) & \(\pm 0.59\) & \(\pm 0.79\) \\ \hline \hline \end{tabular}
\end{table}