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bPrograma de Pós-Graduação em Ecologia e Recursos Naturais – PPGERN, Universidade Federal de São Carlos – UFSCar, (2010)
| Content Provider | CiteSeerX |
|---|---|
| Abstract | The present study discussed the kinetic aspects of leachate decomposition from an aquatic macrophyte, Pistia stratiotes L (water lettuce). This species was collected from Barra Bonita Reservoir located in the State of São Paulo (Brazil). Decomposition chambers were prepared with high molecular weight (HMW), low molecular weight (LMW) and integral (INT = HMW + LMW) dissolved organic matter (DOM) diluted with reservoir water. The samples were incubated at 20 °C, in darkness and under aerobic or anaerobic conditions. For 79 days, the concentrations of dissolved oxygen (DO) and organic carbon (OC) were measured. For calculating the deoxygenation coefficients (kd) and maximum oxygen consumption (CO max) the concentration of DO was integrated and fitted to a first-order kinetics model, which also applied to the depletion of OC concentrations. The CO max of INT incubations were 4 % higher than the sum of HMW and LMW fractions. The deoxygenation coefficients, kd, had the same order of magnitude for all treatments. In relation to carbon decay, regardless of the availability of oxygen, the INT DOM also showed higher mineralisation. These results suggest that the leachate mineralisations are short-term processes; when the fractionation of the leachates occurs, the LMW had |
| File Format | |
| Publisher Date | 2010-01-01 |
| Access Restriction | Open |
| Content Type | Text |
