carbon degradation in agricultural soils flooded with seawater after managed coastal realignment
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2017
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Abstract
Permanent flooding of low-lying coastal areas is a growing threat
due to climate change and related sea-level rise. An increasingly common
solution to protect coastal areas lying below sea level is intentional
flooding by "managed coastal realignment". However, the biogeochemical
implications of flooding agricultural soils with seawater are still not well
understood. We conducted a 1-year mesocosm experiment to investigate
microbial carbon degradation processes in soils flooded with seawater.
Agricultural soils were sampled on the northern coast of the island Fyn
(Denmark) at Gyldensteen Strand, an area that was subsequently flooded in a
coastal realignment project. We found rapid carbon degradation to
TCO2 1 day after experimental flooding and onwards and microbial
sulfate reduction established quickly as an important mineralization pathway.
Nevertheless, no free sulfide was observed as it precipitated as Fe–S
compounds with Fe acting as a natural buffer, preventing toxic effects of
free sulfide in soils flooded with seawater. Organic carbon degradation
decreased significantly after 6 months, indicating that most of the soil
organic carbon was refractory towards microbial degradation under the anoxic
conditions created in the soil after flooding. During the experiment only
6–7 % of the initial soil organic carbon pools were degraded. On this
basis we suggest that most of the organic carbon present in coastal soils
exposed to flooding through sea-level rise or managed coastal realignment
will be permanently preserved.
| Reference Key |
sjgaard2017biogeosciencescarbon
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|---|---|
| Authors | ;K. S. Sjøgaard;A. H. Treusch;T. B. Valdemarsen |
| Journal | tetrahedron letters |
| Year | 2017 |
| DOI |
10.5194/bg-14-4375-2017
|
| URL | |
| Keywords |
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