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Title: The historical dependency of organic carbon burial efficiency
Authors: Radbourne, Alan D.
Ryves, David B.
Anderson, Nicholas John
Scott, Daniel R.
Issue Date: 2017
Publisher: Wiley on behalf of the Association for the Sciences of Limnology and Oceanography (ASLO). © The Authors
Citation: RADBOURNE, A.D. ... et al, 2017. The historical dependency of organic carbon burial efficiency. Limnology and Oceanography, 62 (4), pp. 1480-1497.
Abstract: Many studies have viewed lakes as quasi-static systems with regard to the rate of organic carbon (OC) burial, assuming that the dominant control on BE is sediment mineralization. However, in systems undergoing eutrophication or oligotrophication (i.e., altered nutrient loading), or climatic forcing, the changes in primary production will vary on both longer (> 10 yr) and shorter (seasonal) timescales, influencing the rate of OC accumulation and subsequent permanent burial. Here, we consider the extent to which permanent OC burial reflects changing production in a deep monomictic lake (Rostherne Mere, UK) that has been culturally eutrophied (present TP>200 μg L-1), but has undergone recent reductions in nutrient loading. We compare multi-year dynamics of OC fluxes using sediment traps to longer-term burial rates estimated from two 210Pb-dated sediment cores. The recent sediment record demonstrates that most of the autochthonous OC is preserved (∼95% of OC captured in the deep trap and 86% of the NEP in the contemporary system), contrary to widely held assumptions that this more labile, algal-dominated OC component is not well preserved in lake sediments. A revised method for calculating BE for lakes which have undergone changes in primary productivity in recent decades is developed, which reduces some of problems inherent in existing approaches using historical sediment records averaged over the last 25-150 yr. We suggest that an appreciation of lakes in all biomes as ecosystems responding dynamically to recent human impact and climate change (for example) can improve up-scaled regional and global estimates of lake OC burial.
Description: This is an Open Access Article. It is published by Wiley on behalf of the Association for the Sciences of Limnology and Oceanography under the Creative Commons Attribution 4.0 International Licence (CC BY). Full detals of this licence are available at: http://creativecommons.org/licenses/by/4.0
Sponsor: This work was supported by the Natural Environment Research Council (NERC) [grant number NE/L002493/1] and ADR acknowledges the support of the Research Studentship Award from Central England NERC Training Alliance (CENTA). Furthermore, some data in this study was funded through a NERC small grant [grant number NE/H011978/1]. Additionally, we thank the UKLEON network for providing access to the monitoring station data [NERC small grant number NE/I007261/1].
Version: Published
DOI: 10.1002/lno.10512
URI: https://dspace.lboro.ac.uk/2134/24707
Publisher Link: http://dx.doi.org/10.1002/lno.10512
ISSN: 0024-3590
Appears in Collections:Published Articles (Geography and Environment)

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