Carbon Pools In New Tephra Layers Of Mt. Talang (Indonesia) During Its Initial Weathering Phase | 2487
Journal of Earth Science & Climatic Change
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To date, no global data on carbon sequestration at initial weathering phase of tephra deposits are available. To study carbon
pools in the new volcanic deposit, tephra layers were reconstructed for a period of 46 months. The tephra samples was collected
immediately after eruption of Mt. Talang on April 12th, 2005, over portions of the Solok district in West Sumatra, Indonesia.
Potexperiments with/without soil materials(from A horizon and B horizon of Andisol, Oxisol and Ultisol) covered with the collected
tephra were conducted in wire half-shaded house. The tephra was applied in 0, 2.5 and 5 cm depths to simulate natural tephra
deposition. Every day250 ml of filtered water added and allowed to percolate. Solid fraction from the tephra layer was collected and
analyzed at regular intervals and primary plant succession was observedover a period of 4 years. After 2 months, blue-green algae
(cyanobacteria) started to colonize the bare surface tephra layer to form an algae mat. After 16 months, the surface was transformed
into a green bio-film of lichen. Vascular plants (grasses and shrubs) started to be established after 2 years. Total carbon (TC) content
of tephra layer was increased significantly from 0.19% to 1.75% or 8 times higher after 46 months of incubation. Higher TC storage
was found in the 2.5 cm compared to that of the 5.0 cm tephra layer which was reconstructed above the soil, with values of 1.75%
and 0.89%, respectively. On the contrary, lesser amount of TC was accumulated in the single tephra layer (without soil underneath).
Between 71 to 90% of TC was considered as total organic carbon (TOC). The labile organic carbon (LOC) content in the 2.5 cm
and 5.0 cm of tephra layer was found to be 0.22 and 0.77%, respectively at the end of incubation. This experiment confirmed the
potential of tephra to capture carbon from atmosphere with the help of non-vascular plants and then by vascular plants and finally
sink them in the tephra layer.
Dian Fiantis is currently Professor of Soil Sciences at Faculty ofAgriculture, Andalas University (UNAND). She obtained her PhD degree (2000)
from thetwinning program between Universiti Putra Malaysia and Ghent UniversityBelgium. She did postdoctoral studies at the Department of
Soil ScienceUniversity of Manitoba, Winnipeg, Canada and Ghent University. She jointthe UNAND upon graduation and promoted to full Professor
position on 2009.She has published some papers in reputed peer-review journalsi.e. Geoderma-Elsevier, Communication in Soil Sci. and Plant
Anal. ofTaylor and Francis USA, Eurasian Soil Science and Journal of MountainScience of Springer and Malaysian Journal of Soil Science. Her
researchinterest covers mineralogy and genesis of tropical volcanic ash soils andbiogeochemical weathering of tephra deposits. Currently, she is
thedirector of Laboratory of Soil Survey, Classification and Mapping, Facultyof Agriculture of UNAND.
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