Article (Scientific journals)
Tracing of particulate organic C sources across the terrestrial-aquatic continuum, a case study at the catchment scale (Carminowe Creek, southwest England)
Glendell, M.; Jones, R.; Dungait, J. A. J. et al.
2018In Science of the Total Environment, 616-617, p. 1077-1088
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Keywords :
Biomarkers; Bulk stable 13C and 15N isotopes; Lateral carbon fluxes; Sediment fingerprinting; Agriculture; Catchments; Climate change; Ecosystems; Erosion; Food storage; Food supply; Geochemistry; Isotopes; Land use; Network security; Paraffins; Plants (botany); Rivers; Runoff; Soil conservation; Soil testing; Soils; Agricultural intensification; Anthropogenic impacts; Aquatic environments; Carbon fluxes; Geochemical proxies; Spatial variability; Sediments; Article; England; United Kingdom
Abstract :
[en] Soils deliver crucial ecosystem services, such as climate regulation through carbon (C) storage and food security, both of which are threatened by climate and land use change. While soils are important stores of terrestrial C, anthropogenic impact on the lateral fluxes of C from land to water remains poorly quantified and not well represented in Earth system models. In this study, we tested a novel framework for tracing and quantifying lateral C fluxes from the terrestrial to the aquatic environment at a catchment scale. The combined use of conservative plant-derived geochemical biomarkers n-alkanes and bulk stable δ13C and δ15N isotopes of soils and sediments allowed us to distinguish between particulate organic C sources from different land uses (i.e. arable and temporary grassland vs. permanent grassland vs. riparian woodland vs. river bed sediments) (p < 0.001), showing an enhanced ability to distinguish between land use sources as compared to using just n-alkanes alone. The terrestrial-aquatic proxy (TAR) ratio derived from n-alkane signatures indicated an increased input of terrestrial-derived organic matter (OM) to lake sediments over the past 60 years, with an increasing contribution of woody vegetation shown by the C27/C31 ratio. This may be related to agricultural intensification, leading to enhanced soil erosion, but also an increase in riparian woodland that may disconnect OM inputs from arable land uses in the upper parts of the study catchment. Spatial variability of geochemical proxies showed a close coupling between OM provenance and riparian land use, supporting the new conceptualization of river corridors (active river channel and riparian zone) as critical zones linking the terrestrial and aquatic C fluxes. Further testing of this novel tracing technique shows promise in terms of quantification of lateral C fluxes as well as targeting of effective land management measures to reduce soil erosion and promote OM conservation in river catchments. © 2017 Elsevier B.V.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Glendell, M.;  The James Hutton Institute, Craigiebuckler, Aberdeen, AB15 8QH, United Kingdom
Jones, R.;  University of Exeter, Geography—College of Life and Environmental Sciences, Exeter, EX4 4RJ, United Kingdom
Dungait, J. A. J.;  Sustainable Agriculture Science, Rothamsted Research, North Wyke, Okehampton, Devon EX20 2SB, United Kingdom
Meusburger, K.;  Environmental Geosciences, University of Basel, Bernoullistrasse 30, Basel, 4056, Switzerland
Schwendel, A. C.;  School of Humanities, Religion & Philosophy, York St John University, Lord Mayor's Walk, York, YO31 7EX, United Kingdom
Barclay, R.;  University of Exeter, Geography—College of Life and Environmental Sciences, Exeter, EX4 4RJ, United Kingdom
Barker, S.;  Environment and Sustainability Institute, University of Exeter, Penryn Campus, Penryn, Cornwall TR10 9FE, United Kingdom
Haley, S.;  University of Exeter, Geography—College of Life and Environmental Sciences, Exeter, EX4 4RJ, United Kingdom
Quine, T. A.;  University of Exeter, Geography—College of Life and Environmental Sciences, Exeter, EX4 4RJ, United Kingdom
Meersmans, Jeroen ;  Université de Liège - ULiège > Département GxABT > Analyse des risques environnementaux
Language :
English
Title :
Tracing of particulate organic C sources across the terrestrial-aquatic continuum, a case study at the catchment scale (Carminowe Creek, southwest England)
Publication date :
2018
Journal title :
Science of the Total Environment
ISSN :
0048-9697
eISSN :
1879-1026
Publisher :
Elsevier B.V.
Volume :
616-617
Pages :
1077-1088
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 08 November 2021

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