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

Author(s)

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

Affiliation

^[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

• Document type: Journal article
• Source: Rev. bras. Bot.; v. 43, n. 4 AUG 2020.
• Web of Science Citations: 0

Abstract

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)

• FAPESP's process: 13/22901-0 - Enzymatic activity and bacterial diversity on degradation of aquatic macrophytes
• Grantee: Irineu Bianchini Júnior
• Support Opportunities: BIOTA-FAPESP Program - Regular Research Grants