Hydrocarbon and elemental carbon signatures in a tropical wetland: Biogeochemical evidence of forest fire and vegetation changes

Evidence of changing vegetation in the tropical wetland (Rawa Danau, west Java, Indonesia) over the past 7428 years is illustrated by elemental (soot) carbon (EC) and n-alkane composition of sedimentary geolipids. In this study, vegetation changes and relevant controlling factors (e.g. forest fire a...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2005-06, Vol.59 (11), p.1655-1665
Main Authors: Tareq, Shafi M., Tanoue, Eiichiro, Tsuji, H., Tanaka, Noriyuki, Ohta, Keiichi
Format: Article
Language:English
Subjects:
alkanes
Alkanes - analysis
Alkanes - metabolism
atmospheric deposition
Biodiversity
biogeochemistry
Biomarkers
Biomarkers - analysis
carbon
Carbon - analysis
Carbon - metabolism
community ecology
Danaus
Elemental carbon
Environmental Monitoring
Fires
forest fires
forested watersheds
Humans
Hydrocarbons - analysis
Hydrocarbons - metabolism
Indonesia
Indonesia (Java)
Lake sediments
land use change
lipids
organic matter
plant ecology
Plants
Rawa Danau
sediments
Soil - analysis
soot
Trees
Tropical Climate
tropics
Vegetation changes
wetlands
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Summary:Evidence of changing vegetation in the tropical wetland (Rawa Danau, west Java, Indonesia) over the past 7428 years is illustrated by elemental (soot) carbon (EC) and n-alkane composition of sedimentary geolipids. In this study, vegetation changes and relevant controlling factors (e.g. forest fire and climate change) were documented on a decadal to centennial scale. The n-alkane composition that changes with depth might record changes in sources of organic matter (OM) in the wetland. The presence of EC (0.01–0.24% of organic carbon: OC) during late (0–1700 cal. year BP) and mid (3500–4500 cal. year BP) Holocene (at depths 0–50 cm, and 160–210 cm) indicated that large-scale forest fires severely affected the tropical vegetation. The hydrocarbon indices (CPI: carbon preference index, MCN: mean carbon number, and HVI: hydrocarbon vegetation index) significantly correlated with one another while a comparison of EC profile with the profiles of hydrocarbon indices indicated that n-alkane composition of the geolipid in lake sediment could record signatures of changes in catchment vegetation. Forest fire and vegetation changes might be related to regional climatic shifts relating to ENSO activity as well as being influenced by human influences.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2005.02.019