Sulfate-Reducing Bacteria and Geochemistry of Porewater from Putai Core Sediments in Chianan Plain,Taiwan
Date Issued
2005
Date
2005
Author(s)
Chen, Yu-Ting
DOI
zh-TW
Abstract
The village Putai was one of the four main “blackfoot disease”(BFD) endemic area located on the southwest coast of Taiwan. There have been many studies on accumulation and release of arsenic in sediments in these areas, but geomicrobiologic study is scarce. Sulfate-reducing bacteria contribute a diverse group of prokaryotes that contribute a variety of essential functions in many anaerobic environments. Recently, many studies suggest that sulfate reducers such as Desulfovibrio spp. and Desulfomicrobium spp. might be responsible for arsenate reduction in sediments, and certain sulfate-reducing bacteria might be able to reduce humic substances.
This study aims at revealing the geochemical characteristics of sediments and porewater from a core drilling at Putai. Using molecular biological method, DNA was extracted from sediments. PCR primer sets for the 16S rRNA gene of specific sulfate-reducing bacteria were designed to identify principal sulfate-reducing bacteria related to the reduction of arsenic and humic substances, in sediments with higher concentration of arsenic and humic substances.
The results show that all sediment samples between 20 and 248 m depth have demonstrated the presence of sulfate-reducing bacteria. High concentrations of sulfate and organic matter within the frequent intercalation of clay, silt and fine-grained sand layers favorite growth conditions of sulfate-reducing bacteria. Desulfovibrio and Desulfomicrobium seem to be commons in the layers which have high concentration of arsenic and humic substances. Desulfotomaculum had been found mostly in layers of high humic substances and in some l high arsenic layers. Humic – reducing bacteria such as Desulfobulbus propionicus have also been found at 80m depth.
Subjects
硫酸根還原菌
腐殖物質
砷
沈積物
rearsenic
Sulfate-reducing bacteria
sediments
humic substances
Type
thesis
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