Decomposition dynamics of two aquatic macrophytes: response of litter interaction with temperature and dissolved oxygen availability

Autor(es)

Paccagnella, Yeda Carolina ^[1] ; Bianchini Jr, Irineu ; da Cunha-Santino, Marcela Bianchessi ^{[2, 3]}

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Programa Pos Grad Ecol & Recursos Nat, Sao Carlos, SP - Brazil

^[2] Bianchini Jr, Jr., Irineu, Univ Fed Sao Carlos, Programa Pos Grad Ecol & Recursos Nat, Sao Carlos, SP - Brazil

^[3] Bianchini Jr, Jr., Irineu, Univ Fed Sao Carlos, Dept Hidrobiol, Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Rev. bras. Bot.; v. 43, n. 4 AUG 2020.
• Citações Web of Science: 0

Resumo

The decomposition of a single macrophytes species may not represent entirely the carbon cycling in aquatic ecosystems, as in the freshwater macrophyte-dominant environments several species grow and decay concomitantly. To assess the interaction of the two species in the decomposition process, the temporal variation of particulate organic carbon (POC) ofHedychium coronariumJ. Konig,Typha domingensisPersoon and the mixed sample (50% of each species) was mathematically modeled. Kinetic models were used to verify the temperature and the availability of dissolved oxygen, as regulating factors in decomposition. The aerobic processes favored a faster decay when compared to anaerobic processes. The occurrence of two phases in decomposition was observed: (1) with a rapid mass loss (POCLS) and (2) with a slow degradation (POCR). During the aerobic decomposition, independently of variation in temperature, the effect was always antagonistic. However, under anaerobic conditions, the three types were observed (antagonistic, additive and synergic). The mixed detritus always displayed the highestQ(10)coefficient. Modeling mixed detritus decomposition was a reliable predictive framework of litter decomposition at a ecosystemic scale, improving ecosystem response of carbon cycling feedback under an increasing temperature. (AU)

• Processo FAPESP: 13/22901-0 - Atividade enzimática e diversidade bacteriana da degradação de macrófitas aquáticas
• Beneficiário: Irineu Bianchini Júnior
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Regular