Journal of Soils and Sediments

, Volume 18, Issue 4, pp 1232–1241 | Cite as

Contribution of humic substances as a sink and source of carbon in tropical floodplain lagoons

  • Irineu BianchiniJr
  • Marcela Bianchessi da Cunha-Santino
Natural Organic Matter • Chemistry, Function and Fate in the Environment

Abstract

Purpose

We evaluated the decay of humic (HA) and fulvic acids (FA) in order to discuss the contribution of these substances as a sink and source of carbon in a tropical lagoon.

Materials and methods

Experiments were conducted under aerobic and anaerobic conditions using FA and HA isolated from decomposition of Oxycaryum cubense submitted to 10 and 60 days of degradation. HA and FA were added to water samples from a tropical floodplain oxbow system, the Infernão Lagoon. The mineralization chambers were incubated in the dark at 21.0 °C. The carbon balance, electrical conductivity, pH, and optical density were measured over 95 days.

Results and discussion

The results from the carbon budget were fitted with a first-order kinetics model. The mineralization of refractory fractions predominated for both FA and HA. Overall, although the mineralization pathway yields varied according to the type of resource and oxygen availability, the mineralization half-lives were quite similar (49 to 64 days), suggesting a similar microbial catabolism efficiency during the decay of humic substances. The short-term routes are represented by biochemical oxidations, and the immobilization and labile fractions (varying from 0 to 30%) of FA and HA supported these processes. A yield varying from 61.0 to 91.3% represents a carbon source degradation in the middle term (ca. 2 months) considering the ecosystem.

Conclusions

In tropical floodplain lagoons, there are three carbon routes: (i) the IN1, representing a short-term pathway (hours to days) in the carbon transformation and (ii) IN3, a middle-term carbon source from HA and FA mineralization to the water column and subsequently to the atmosphere. A third route (IN2) supported the heterotrophic metabolism of the lagoon acting as a transitory sink of carbon.

Keywords

Aquatic plants Floodplain lagoon Fulvic acid Humic acid Mathematical models Oxycaryum cubense 

Notes

Acknowledgments

The authors would like to thank the São Paulo Research Foundation (FAPESP processes n°: 95/0119-8; 2007/08602-9) and the Brazilian National Council for Scientific and Technological Development for the scholarship (CNPq process number 301765/2010-3). We are also indebted to Dr. Osvaldo N. Oliveira Jr. (IFSC-USP) for his critical proofreading of the manuscript.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Irineu BianchiniJr
    • 1
    • 2
  • Marcela Bianchessi da Cunha-Santino
    • 1
    • 2
  1. 1.Departamento de HidrobiologiaUniversidade Federal de São CarlosSão CarlosBrazil
  2. 2.Programa de Pós-Graduação em Ecologia e Recursos NaturaisUniversidade Federal de São CarlosSão CarlosBrazil

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