Stable carbon and nitrogen isotopic composition of bulk aerosol particles in a C4 plant landscape of southeast Brazil

摘要

The carbon and nitrogen isotopic compositions of aerosol particles collected in the Piracicaba region, where C4 plants like sugarcane and pasture dominate the land cover, were measured. For comparison, aerosol particles were also analyzed from the Santar6m region, Amazon basin, where the main land cover is primary forest. The average δ~(13)C value of samples collected in Piracicaba was equal to -20.9 ± 0.8‰. The average δ~(13)C of samples collected in Santarem was almost 5‰ smaller than in Piracicaba (-25.8 ± 0.5‰). This difference between the two sites was attributed to the presence of C4 material in Piracicaba aerosol particles.