SOC sampling and analysis
In each plot, one soil core was extracted with a 5 x 5 cm probe at 0-20
cm soil depth. Carbon content of the fine earth was determined by the
elemental auto-analyzer. The organic C fraction was determined by
subtracting inorganic C in the carbonates from the total C. Soil organic
carbon stocks (SOC) in the upper 20 cm soil layer were then estimated
taking into account the organic C concentration in the sample and its
bulk density, and subtracting the coarse particle (> 2 mm)
content, following GarcĂa-Pausas et al. (2007). See Rodriguez et al.
2020 for further details about SOC sampling and determination.