The burial efficiency of organic carbon in the sediments of Lake Kinneret |
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| Authors: | Sebastian Sobek Roland Zurbrügg Ilia Ostrovsky |
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| Institution: | 1.Eawag, Swiss Federal Institute of Aquatic Science and Technology,Kastanienbaum,Switzerland;2.Institute of Biogeochemistry and Pollutant Dynamics,ETH, Swiss Federal Institute of Technology Zurich,Zürich,Switzerland;3.Department of Ecology and Genetics, Limnology,Uppsala University,Uppsala,Sweden;4.Israel Oceanographic and Limnological Research,Yigal Allon Kinneret Limnological Laboratory,Midgal,Israel |
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| Abstract: | Even though lake sediments constitute a significant long-term carbon sink, studies on the regulation of carbon burial in lakes
sediments have, to date, been surprisingly few. We investigated to what degree the organic carbon (OC) being deposited onto
the bottom of Lake Kinneret (Israel) is buried in the sediment at four different sites with varying degrees of oxygenation
and varying supply of allochthonous particles from the River Jordan. For estimation of the OC burial efficiency (OC BE), i.e.,
the ratio between buried and deposited OC, we calculated OC burial from dated sediment cores, and calculated OC deposition
using three different approaches. Calculation of OC deposition from sediment trap-derived mass deposition rates multiplied
with the OC content of surface sediment yielded OC BE values that were at odds with published values for sediments dominated
by autochthonous OC sources. Calculation via sediment trap data on organic matter flux collected within the Lake Kinneret
monitoring program, as well as calculation of OC deposition as the sum of OC burial plus OC mineralization, returned fairly
congruent estimates of OC BE (range 10–41%), but only if the sediment trap data were corrected for the proportion of resuspended
particles in the traps. Differences in OC BE between sites were small, indicating that OC source (common to all sites) was
a more important regulator of OC BE in Lake Kinneret than oxygen exposure or mineral particles characteristics. |
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