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Published (Version of record)CC BY V4.0, Open Access
Published (Version of record)CC BY V4.0, Open
Journal article
Biofilm-specific uptake does not explain differences in whole-stream DOC tracer uptake between a forest and an agricultural stream
Biogeochemistry, Vol.144(1), pp.85-101
06/2019
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Abstract
Benthic biofilms are often assumed to control terrestrially-derived dissolved organic carbon (tDOC) uptake in streams. We tested this by comparing 13C-enriched ryegrass leachate uptake in an agricultural and a forest stream, hypothesizing that a greater abundance of autotrophic biofilms in the agricultural stream would cause its whole-stream tDOC uptake to be comparatively low. We measured whole-stream and biofilm tDOC tracer uptake, metabolism, bacterial and algal diversity, and nutrient status of benthic epilithic biofilms, and assessed whole-stream hydromorphology. Whole-stream uptake of tDOC was six times lower in the agricultural (3.0 mg m−2 day−1) than in the forest (19.0 mg m−2 day−1) stream, and tDOC uptake velocity indicated lower tDOC demand in the agricultural (1.2 mm min−1) than in the forest (1.9 mm min−1) stream. The agricultural stream differed from the forest stream by slightly lower transient storage capacity and higher benthic biofilm bacterial abundance and production, lower biofilm biomass and lower biofilm molar C:N, C:P, and N:P ratios. Changes in epilithic biofilms contributed little to the differences in whole-stream tDOC tracer uptake between streams, as biofilm tDOC uptake only amounted to 4% and 13% of whole-stream uptake in the forest and agricultural stream, respectively. This comparison of a forest and an agricultural stream suggests that agricultural stressors have the potential to diminish both whole-stream tDOC uptake and uptake efficiency. Furthermore, the weak link between biofilm and whole-stream tDOC uptake implies that benthic biofilms characteristics are poor predictors for human impacts on tDOC uptake in agricultural streams and that hot spots of tDOC uptake are likely situated in the hyporheic zone or in the stream water column.
Details
- Title
- Biofilm-specific uptake does not explain differences in whole-stream DOC tracer uptake between a forest and an agricultural stream
- Creators
- D Graeber - Helmholtz Centre for Environmental Research - UFZB Gücker - Federal University of São João del-ReiR Wild - Helmholtz Centre for Environmental Research - UFZN. S. Wells - Southern Cross UniversityC Anlanger - Helmholtz Centre for Environmental Research - UFZN Kamjunke - Helmholtz Centre for Environmental Research - UFZH Norf - Helmholtz Centre for Environmental Research - UFZC Schmidt - Helmholtz Centre for Environmental Research - UFZM Brauns - Helmholtz Centre for Environmental Research - UFZ
- Publication Details
- Biogeochemistry, Vol.144(1), pp.85-101
- Publisher
- Springer Netherlands; Cham
- Grant note
- BR 4358/1-1 / German Science Foundation 305712/2018-7 / Brazilian National Council for Scientific and Technological Development CRA PPM 00596-16; CRA 11/12 / Fundação de Amparo à Pesquisa do Estado de Minas Gerais (http://dx.doi.org/10.13039/501100004901)
- Identifiers
- 991012926991002368
- Copyright
- © The Author(s) 2019 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
- Academic Unit
- Centre for Coastal Biogeochemistry; School of Environment, Science and Engineering; Faculty of Science and Engineering; Science
- Language
- English
- Resource Type
- Journal article