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Title page for ETD etd-07162015-214524


Type of Document Master's Thesis
Author Fry, David Christopher
Author's Email Address david.c.fry@vanderbilt.edu
URN etd-07162015-214524
Title Characterizing temporal and spatial trends in soil geochemistry on Polder 32, southwest Bangladesh
Degree Master of Science
Department Earth and Environmental Sciences
Advisory Committee
Advisor Name Title
John C. Ayers Committee Chair
Steven L. Goodbred, Jr. Committee Member
Keywords
  • soil arsenic
  • soil acidity
  • soil salinity
Date of Defense 2015-05-29
Availability unrestricted
Abstract
Soil samples were collected during three field campaigns to determine seasonal and spatial trends of soil salinity, soil acidity and arsenic concentrations on Polder 32 in coastal Bangladesh. Many farmers on Polder 32 use a crop rotation of rice cultivation in the wet season and shrimp farming in the dry season, and studies have shown that this rotation can increase soil salinity and acidity. Soil samples were collected from rice paddies and shrimp ponds on the polder, from adjacent tidal channels, and from the Sunderbans mangrove forest to the SE of the polder, and analyzed for both geochemical and physical parameters and then subjected to statistical tests and mapped using geographic information system software to find correlations. Results support the belief that soil salinity, acidity and arsenic concentration exhibit spatial variation, and soil salinity and acidity show seasonal variation. Rice grown in paddies should be unaffected by salt concentrations in the wet season, while arsenic concentrations in soil may be high enough to cause unsafe As levels in produced rice. Future studies should measure the As concentration in rice to determine the risk of bioavailable arsenic transmitted from soil in the area. No evidence of soil acidification was found, most likely due to the presence of soil carbonate.
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