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N-Alkanes in Permafrost Peatlands
Alexander Pastukhov1, Dmitry Kaverin1, Sergey Loiko2
1Institute of Biology Komi Science Centre Ural Branch Russian Academy of Sciences, Kommunisticheskaya 28, 167982 Syktyvkar, Russia.
High-performance liquid chromatography (HPLC) analysis of permafrost peatlands reveals significantly higher n-alkane content in Eastern Europe than in Western Siberia. Differences in n-alkane composition reflect varying plant origins and peat decomposition stages influenced by distinct hydrological and climatic conditions.
Area of Science:
- Geochemistry
- Paleoclimatology
- Organic Geochemistry
Background:
- Permafrost peatlands are crucial archives of past environmental conditions.
- Understanding n-alkane distribution in these environments provides insights into vegetation history and decomposition processes.
- Cryolithozone ecosystems are sensitive indicators of climate change.
Purpose of the Study:
- To identify and quantify n-alkanes (C21-C33) in Eastern European and Western Siberian permafrost peatlands.
- To compare the n-alkane composition and content between these two regions.
- To correlate n-alkane data with peat physicochemical properties and environmental conditions.
Main Methods:
- High-performance liquid chromatography (HPLC) was employed for the separation and quantification of n-alkanes.
- Analysis focused on the C21-C33 carbon number range.
- Various indices including CPI, HPA, Paq, C23/C29, and C23/(C27+C31) were calculated.
Main Results:
- Total n-alkane content was 7.4 times higher in European peatlands (282 ± 145 μg/kg) compared to Siberian peatlands (38 ± 12 μg/kg).
- European peatlands showed higher plant input (CPI: 9.5 ± 2.4) and decomposition (HPA: 0.10 ± 0.03) than Siberian peatlands (CPI: 6.9 ± 2.1, HPA: 0.15 ± 0.05).
- Distinct hydrological regimes (excess moisture in Siberia vs. variable conditions in Europe) and lower mean annual temperatures in Siberia influenced n-alkane composition.
Conclusions:
- Regional differences in n-alkane composition are driven by botanical sources, peat decomposition, and Holocene climatic variations.
- Western Siberian peat plateaus formed under consistently moist conditions, while Eastern European peatlands experienced fluctuating moisture and permafrost dynamics.
- No significant correlation was found between n-alkane profiles and peat physicochemical properties, highlighting the dominant role of climatic and botanical factors.
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