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Aquatic Sciences

, Volume 78, Issue 3, pp 447–462 | Cite as

The mineralisation of dissolved organic matter recovered from temperate waterbodies during summer

  • Marc I. Stutter
  • Jonathan Cains
Research Article

Abstract

Natural dissolved organic matter (DOM) has many forms in freshwaters, controlling C availability for heterotrophic respiration and ecosystem functions in headwaters and downstream ecosystems. This study aimed to examine the respiration of DOM recovered using reverse osmosis (RO) during extended summer baseflow from a parkland Pond (DOMPond) and three headwater rivers: moorland (DOMMoor), mixed agriculture (DOMAgr) and predominantly moorland system with mixed riparian forest (DOMForest), and compared to glucose and soil-derived fulvic acid. Batch decomposition tests at time points up to 379 h were completed in a replicated 96-well micro-plate system (MicroResp) spiking river sediments carrying a standardised microbial inoculum with C sources at two concentrations (1513 and 30 µgC/g sediment dry matter). Respiration rates were greatest initially and declined over time with an exponential form. Total C respired (38–80 %, following subtraction of basal respiration controls) for the high C treatment followed: DOMForest > DOMAgr > DOMMoor > DOMPond > Fulvic acid. A similar order occurred at the low C treatment but BDOC >100 % was evidence that added DOM primed respiration of the sediment C above that of basal controls. Despite issues of high background salt concentrations in the DOM matrix caused by the RO procedure results show that even under summer baseflow conditions DOM can be highly labile. Labile C generated especially from agricultural catchments and those with riparian forests may be conveyed downstream to fresh and estuarine waters to control ecological processes at critical times of the year.

Keywords

Dissolved organic matter Microbial respiration Nutrients Land use Headwaters Pond Sediments 

Notes

Acknowledgments

We are grateful to the funding support from Scottish Government RESAS to allow this work to take place under the NERC Macronutrient Cycles Program. We also acknowledge the help of Clare Cameron in setting up the MicroResp test system.

Supplementary material

27_2015_446_MOESM1_ESM.docx (35 kb)
Supplementary material 1 (DOCX 35 kb)

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Copyright information

© Springer International Publishing 2015

Authors and Affiliations

  1. 1.The James Hutton InstituteAberdeenUK
  2. 2.School of Geosciences, King’s BuildingsUniversity of EdinburghEdinburghUK

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