Sequestration of soil organic carbon in grasslands in the province of El Oro, Ecuador
DOI:
https://doi.org/10.29076/issn.2528-7737vol13iss32.2020pp14-26pKeywords:
Brachiaria, soil properties, net production of biomass, colony forming unitsAbstract
The soil is the natural resource most vulnerable to climate change, because it represents the largest carbon pool and its productive potential is at risk from the intensification of agricultural and livestock. The capacity to store soil organic carbon (SOC) by grasslands should be studied, as they occupy the largest area on the planet. The objective of this research was to characterize two soils cultivated with pasture of Brachearía sp. (signalgrass) describing some general properties of the soil and the net biomass production (NBP) at root level; in addition, the storage of SOC at different depths in grasslands in the province of El Oro (Ecuador) was analyzed. Plots of 3.0 ha were established in Santa Inés (SI) and Cune (CN), where soil and root biomass samples were taken. The sample depth was 0-0.10 m (C1), 0.10-0.20 m (C2) and 0.20-0.30 m (C3). Differences were shown in soil pH (alkalinity for SI; acidity for CN), and clay percentages (<157.11 g kg-1 in CN). A higher number of colony-forming units was determined in bacteria and NBP in CN, as well as the greater accumulation of SOC (C3=35.01 Mg ha-1; C2=33.44 Mg ha-1), while in SI the higher value was 18.43 Mg ha-1 in C1. In general, the results suggest that an adequate knowledge of geology is needed to better limit the evolution of the stored SOC.
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