ABSTRACT

Soil CO₂ emissions (fCO₂) in agricultural areas have been widely studied in global climate change research, but its characterization and quantification are restricted to small areas. Because spatial and time variability affect emissions, tools need to be developed to predict fCO₂ for large areas. This study aimed to investigate soil magnetic susceptibility (MS) and its correlation with fCO₂ in an agricultural environment. The experiment was carried out on a Typic Eutrudox located in Guariba-SP, Brazil. Results showed that there was negative spatial correlation between fCO₂ and the magnetic susceptibility of Air Dried Soil (MS_ADS) up to 34.3 m distant. However, the fCO₂ had no significant correlation with MS_ADS, magnetic susceptibility of sand (MS_SAND) nor clay (MS_CLAY). However, MS_ADS could be a supplemental mean of identifying regions of high fCO₂ potential over large areas.

magnetism; soil respiration; spatial variability; geostatistics