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| Titel |
Impacts of agricultural expansion on sedimentary organic matter composition
in Lake Soyang (South Korea) |
| VerfasserIn |
Sujin Kang, Jung-Hyun Kim, Jaap S. Sinninghe Damsté, Jong-Ku Gal, Dong-Hun Lee, Sang-Han Lee, Bomchul Kim, Kyung-Hoon Shin |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250131934
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| Publikation (Nr.) |
 EGU/EGU2016-12389.pdf |
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| Zusammenfassung |
| The agricultural area has been expanded since the 19th century and agricultural activities
such as eroded soils, nutrient, and organic matters may impact aquatic environments. The
Lake Soyang is the deepest and largest artificial dam reservoir constructed in South Korea in
1973. Lake Soyang has been experienced an expansion of agricultural area since the 1990s.
In this study, we investigated the impact of agricultural expansion on sedimentary organic
matter in Lake Soyang. We collected soils (n=7), lake surface sediments (n=9) and a 50-cm
sediment core at near the dam for the analysis of total organic carbon (TOC) and total
nitrogen (TN) contents, stable isotopic composition of TOC and TN (δ13CTOC and δ15N),
and glycerol dialkyl glycerol tetraethers (GDGTs). The age model of the sediment core
is based on 210Pb analysis. In lake surface sediments, bulk and GDGT-derived
geochemical data indicate that C3-derived soil OM was the major source in the upper part
of the lake while an aquatic contribution increased in the lower part of the lake.
The sediment core showed a distinctive shift in all parameters considered at 15 cm
core depth. However, it was difficult to constrain the exact age of this depth due to
the dating uncertainties. Nonetheless, our study implies the potential influence of
agricultural expansion on changes in sedimentary OM composition in Lake Soyang. |
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