DOC in bulk precipitation
The average BP DOC concentration was 5.17 (± 4.25)
mg.L-1, presenting considerable variation between the
events. Highlights were the highest concentrations in EV3 and EV7,
respectively in winter and spring (figure 5). Apart from these two
occurrences, the DOC concentration was always below the level of 04
mg.L-1, with the lowest concentration occurring at the
end of winter (EV4).
Rainfall intensity was the only variable to present a significant linear
model in an inversely proportional relationship to BP DOC concentrations
(table 2). Regarding the previous rainfall variables, the time-interval
of better adjustment was the previous 15-days, but the significance
value did not corroborate the model (P > 0.05).
When analyzed by multiple regression the two variables of best
individual adjustments (RfI and AcR 15-day), there increased the
coefficient of determination, but the model was non-significant. When
analyzing all variables combined (excluding the accumulated 10 and 30
days), there was a considerable increase in the determination
coefficient, but remaining a non-significant model.