Among ecoregions, variation was the

Among ecoregions, variation was the highest in the AP, BT and MM ecoregions and lowest
in the PL ecoregion. This is, in part, contrary to the findings of Penney (2004) who reported that
the BT and PL were the ecoregions that exhibited the least variation. Among sampling depths,
CVs were higher at the 0 to15 cm sampling depth for EC, NH4-N and SO4-S, and were higher at
the 15 to 30 cm sampling depth for NO3-N and STP (Table 6). Among landscape positions, CVs
were similar except for SO4-S, where variability was greater at the lower slope position than at
the mid or upper positions (Table 6).