Carbon cycling potential from Utricularia breviscapa decomposition in a tropical oxbow lake (Sao Paulo, Brazil)

Autor(es)

da Cunha Santino, Marcela Bianchessi ^[1] ; Bianchini, Jr., Irineu ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Programa PosGrad Ecol & Recursos Nat, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Hidrobiol, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ECOLOGICAL MODELLING; v. 218, n. 3-4, p. 375-382, NOV 10 2008.
• Citações Web of Science: 7

Resumo

The rate of decomposition of aquatic macrophytes is controlled by environmental factors such as temperature and oxygen availability. Laboratory assays were carried out to evaluate the decomposition rates of Utricularia breviscapa under controlled conditions of dissolved oxygen and temperature. Measured decomposition rates were then used in model simulations of expected decomposition rates using field collected monthly temperature and dissolved oxygen measures. The incubations were comprised of U. breviscapa detritus added to Oleo Lagoon water under aerobic and anaerobic conditions at 15.3 degrees C, 20.8 degrees C, 25.7 degrees C and 30.3 degrees C in the dark. Mass loss and leachate formation were monitored over 180 days. Overall, the decomposition process was faster under aerobic than anaerobic conditions and by increasing at higher temperature. Considering the seasonal changes of temperature and oxygen availability of Oleo Lagoon, the simulated values of mineralization rates of dissolved organic carbon (DOC) and refractory particulate organic carbon (POCR) suggest faster carbon cycling in November. Based on these simulations, in the cold months (June and July) the DOC and COPR mineralization processes were 22% and 25% lower than in the warmer months (October and November), respectively. On average, the DOC mineralization process was 3.7 times faster than POCR. (c) 2008 Elsevier B.V All rights reserved. (AU)

• Processo FAPESP: 00/09297-6 - O efeito da temperatura e o papel das enzimas na decomposição de Salvinia auriculata e Utricularia gibba da Lagoa do Óleo (Luiz Antônio, SP)
• Beneficiário: Irineu Bianchini Júnior
• Modalidade de apoio: Auxílio à Pesquisa - Regular