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RISS 인기검색어
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- 저자 : 권오섭 ( Seong Han Kim (검색결과 2 건)
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김성한,윤인길,권오섭 ( Seong Han Kim,In Kil Yoon,O Seob Kwon ) 한국하천호수학회 1997 생태와 환경 Vol.30 No.3
Under the laboratory batch systems, we measured the nutrient release from the sediment of Seo-Naktong River to the overlying water. The concentration of NH_4+ in the water columns appeared the maximum at the beginning of incubation and decreased until 10-day incubation, and after that time the concentrations were relatively constant. The variation pattern of NO-3- was reversely matched with the pattern of NH_4+, and the maximum of PO-43- was detected at 24-day incubation. With this concentration changes of nutrients, NH_4+ release from the sediment layer to the water column of Seo-Naktong River was calculated as 53.9 mg-N/m^2/d, and PO_43- release as 5.3 mg-P/m^2/d. Considering the changes of nutrients, dissolved oxygen, and pH of water column and sediment porewater in the incubation chambers, and the field data of Seo-Naktong River, the mechanism of nutrient release in Naktong River was supposed that high concentrations of NH_4+ released are oxidized to NO-3- via nitrification, and the resulting anaerobic condition, especially in bottom layer of water column, stimulates the release of P0_43-.
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김성한,윤인길,송성주,김영의,권오섭 ( Seong Han Kim,In Kil Yoon,Seong Ju Song,Young Eui Kim,O Seob Kwon ) 한국하천호수학회 1996 생태와 환경 Vol.29 No.3
Depth profiles of physico-chemical parameters and distributions of benthic microorganisms were measured at the sediments of Ulsukdo, Naktong Estuary to identify the relatedness with the anaerobic degradation of sedimented organic matters. The organic contents, total nitrogen, and total phosphorous were decreased with increasing depth, but the patterns of inorganic nutrients of porewater showed no distinct profiles. Among inorganic sulfur compounds, the concentration of sulfide was varied with the depth. The observation that the highest cell numbers of total bacteria, heterotrophic bacteria, sulfur-oxidizing bacteria, anaerobic photosynthetic bacteria, and sulfate-reducing bacteria were found in the uppermost layer of the sediment was well coincided with the depth profiles of parameters of nutrient loading. At the upper layer of sediments, the density of methanogens was lower than that of sulfate-reducing bacteria, but at the lower layer, the former was higher. With this result, it could be supposed that at the upper sediments layer of Ulsukdo the fermentation products of organics were degraded mainly by sulfate-reducing bacteria but at the lower layer methanogens were the main degrading ones. Although the depth profiles of organic contents and sulfur bacteria had similar patterns, the distributions of inorganic sulfur compounds except sulfide were nearly constant and the cell numbers of sulfur bacteria were only a very few portions of total bacterial counts. These resulsts suggest that the effects of sulfur bacteria on the cycling of sedimented organics might be negligible at Ulsukdo of Naktong River Estuary.
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