COBERTURA FLORESTAL E VAZ?ES DE BACIAS HIDROGRAFICAS DA MATA ATL?NTICA

摘要

The present study analyzed the average and minimum streamflow behavior of 11 watersheds located in the Atlantic Forest Biome, relating them to the changes in forest cover. The average minimum flow with seven days of duration (Q 7 ), the average annual flow (Q ave ), the total annual precipitation (P a ) and the percentage of forest cover (FC) for each watershed were determined. The joint correlation between the FC and the P a with the flow for each watershed were analyzed by adjusting multiple linear regression equations. The partial correlation coefficient was also used to analyze whether the variation in the FC influenced the water flow when the effects of P a are fixed. This study allowed us to identify significant associations between FC and P a with Q 7 or Q ave in only two of the watersheds. Disregarding the effects of P a , the increase in the FC tended to result in a reduction in the Q ave , and in turn increased the Q 7 in these two watersheds.