Skip to main content

Advertisement

Log in

Kinetic aspects of humic substances derived from macrophyte detritus decomposition under different nutrient conditions

  • Research Article
  • Published:
Environmental Science and Pollution Research Aims and scope Submit manuscript

Abstract

Autochthonous particulate organic carbon (POC) is an important precursor of humic substances (HS), and macrophytes represent the major source of POC in tropical aquatic ecosystems. Autochthonous HS influence the carbon supply, light regime, and primary production within freshwater systems. This study addresses the conversion of POC from two macrophyte species into HS and their mineralization under different nutrient conditions (oligotrophic to hypereutrophic). A first-order kinetic model was adopted to describe the conversion routes. The POC conversion rate to HS for detritus derived from Paspalum repens was similar under different nutrient conditions, but eutrophication decreased the kR (global coefficient reaction) for detritus from Pistia stratiotes due to its high detritus quality (C:N:P ratio). Fulvic acids were the main fraction of HS in both plants. The mineralization of humic acids from P. stratiotes was inhibited at higher nutrient availability, while eutrophication increased the mineralization of fulvic acids from P. repens. The main route of POC cycling is humification through fulvic acid formation (up to 40% of POC). The intrinsic characteristics of the source detritus were the main forcing functions that stimulated the cycling of HS. In tropical aquatic ecosystems, the degradation of autochthonous carbon decreased due to eutrophication, thus contributing to the diagenetic process in the long term.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2

Similar content being viewed by others

References

Download references

Acknowledgments

The authors would like to thank the critical contribution of Kevin Murphy (University of Glasgow, UK), who revised the English language in this manuscript.

Funding

The authors would like to thank the Fundação de Amparo à Pesquisa do Estado de São Paulo – FAPESP (Process number 2012/21829-0) for their financial support.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Flávia Bottino.

Additional information

Responsible editor: Céline Guéguen

Publisher’s note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Electronic Supplementary Material

ESM 1

(DOCX 190 kb)

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Bottino, F., Cunha-Santino, M.B. & Bianchini, I. Kinetic aspects of humic substances derived from macrophyte detritus decomposition under different nutrient conditions. Environ Sci Pollut Res 26, 15931–15942 (2019). https://doi.org/10.1007/s11356-019-04882-z

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s11356-019-04882-z

Keywords

Navigation