Quantification of carbon capture in different soil uses
Carbon sequestration by soils in different production systems contributes greatly to the reduction of greenhouse gases. The objective of this study was to quantify the carbon stored in four land uses (fodder banks, potato, live fences and pastures) at different depths (30 and 60 cm). To this end, a design of Complete Random Blocks (CABs) was made with a bifactorial arrangement, Factor A: land uses (natural pastures, live fences, fodder banks and potato cultivation) and Factor B: two depths (30 and 60 cm), with three replications. To determine the percentage of carbon in the soil, complete soil samples were taken at the different depths and taken to the laboratory for analysis. As a result, marginal significant differences were found in soil uses (Pr > F= 0.0573); between the depths of 30 and 60 cm significant differences were found (Pr > F= 0.0061). However, no statistically significant differences were found in land use interaction by depth (Pr > F= 0.0659). The fodder bank presented a higher organic carbon content (139.85 tC.ha-1) at 60 cm depth and the potato monoculture (63.32 tC.ha-1) at 30 cm depth while, at both depths, natural pasture reported lower values (54.45 and 60.02 tC.ha-1). Hence, the importance of productive systems to accumulate more carbon at greater depths of soil (60 cm) compared to lower depths (30 cm), which may be linked to management practices that are made on the top layers of the soil, generating carbon leakage.
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