QUANTIFICATION OF SOIL CO₂ EMISSIONS IN TWO FORESTED AREAS UNDER DIFERENT REGENERATION STAGES IN ATLANTIC FOREST

In order to quantify emission rates of CO₂ through the soil from the Atlantic forest under different regeneration stages, two areas located in Rio Claro(SP) were studied. In the first area the forest is regenerated (Plot 23) and the average CO₂ emission is 1.91 mmol m^-2s^-1, while in the recently planted area (Plot 15), the average emission is 1.38 mmol m^-2s^-1. The CO₂ emissions are fairly correlated to soil moisture (r=0.53, P=<0.0001), C/N ratio (r=0.27, p<0.05) and time of measurement (r=0.33, p<0.05). Multiple linear regression models developed are better to reproduce CO₂ soil emissions in recently planted area.

Keywords:
soil CO₂ emissions, multiple linear regression; infrared gas analyzer; Atlantic forest