NDLI: Sedimentation rates in Bera Lake (Peninsular Malaysia) using $^{210}$Pb and $^{137}$Cs radioisotopes

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Sedimentation rates in Bera Lake (Peninsular Malaysia) using $^{210}$Pb and $^{137}$Cs radioisotopes

Content Provider	Springer Nature Link
Author	Gharibreza, Mohammadreza Raj, John Kuna Yusoff, Ismail Othman, Zainudin Tahir, Wan Zakaria Wan Muhamad Ashraf, Mohammad Aqeel
Copyright Year	2013
Abstract	The evolutionary environmental history of Bera Lake was studied using the fallout radioisotopes$^{137}$Cs and $^{210}$Pb. $^{317}$Cs horizons in the all ten studied cores showed a constant rate of $^{210}$Pb supply along all distinctive layers in each core. The lithology of layers significantly affected the variation of $^{210}$Pb value with depth. The chronology of Bera Lake sediment was conducted using the Constant Rate of Supply (CRS) model. The 1963 fallout maximum $^{137}$Cs from atmospheric testing of nuclear weapons found in all selected master cores at the depth of 40 cm. The mean pre-1950 sediment accumulation rate was ranged between 0.06 ± 0.02 and 0.16 ± 0.2 g cm$^{−2}$ y$^{−1}$. Environmental impacts of five deforestation projects performed from 1972 to 1995 at the catchment area, contributed significantly toward increasing the sedimentation rate within Bera Lake. Besides the $^{137}$Cs horizons, the charcoal horizon at the lower contact of white sandy mud revealed the datum of maximum deforestation in the study area. $^{210}$Pb dates using the CRS model correlated historical sediment fluxes to anthropogenic changes in Bera Lake catchment area. Organicrich sediments deposited mostly at the top of the Bera Lake sediment columns with a mean rate of 0.2 ± 0.1 g cm$^{−2}$ y$^{−1}$ since 1994. High biomass productivity of mature oil palm plantations, which were developed in the catchment area, dictated organic-rich deposit distribution. This study highlighted capability of radioisotopes to reconstruct long-term (100–150 years) history of a natural lake at a tropical area where surrounding catchment has extensively deforested over the recent decades.
Starting Page	211
Ending Page	220
Page Count	10
File Format	PDF
ISSN	12264806
Journal	Geosciences Journal
Volume Number	17
Issue Number	2
e-ISSN	15987477
Language	English
Publisher	The Geological Society of Korea
Publisher Date	2013-03-02
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bera Lake CRS model deforestation $^{210}$Pb and $^{137}$Cs radioisotopes sedimentation rate Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Environmental Science

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