3. Results
3.1. Soil properties at sites implementing SWC measures
The abundance of both SOC and TN was relatively small, with values consistently lower than 10 mg C g−1 and 1.0 mg N g− 1 (Table 1). Signif- icantly greater values of SOC and TN were observed in ‘trench’ com- pared to ‘undisturbed’ and ‘mound’ sampling locations. However,these differences between sampling locations got smaller and non- significant at the deepest interval. A similar trend to that of SOC and TN was observed for δ15N values, while the opposite was true for δ13C, which had the lowest values in ‘trench’ locations.
Table 2 shows soil properties determined for the 0.0–0.30 m depth
interval for the different sampling locations. While no significant differ- ences were observed between sampling locations for any of the studied variables in ‘Fanya-Grass’ sites, the ‘trench’ sampling location generally showed significant differences in ‘Fanya-Tree’ sites. The overall differ- ences between both agricultural practices were significant for both δ13C and δ15N values, as well as for C/N ratios, SBD and pH values (Table 2).