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어류폐사의 발생 이후 하천에서 수질의 변화 및 어류상 회복
이재용 ( Jae Yong Lee ),이광열 ( Kwang Yeol Lee ),이새로미 ( Sae Ro Mi Lee ),최재석 ( Jae Seok Choi ),이석종 ( Seok Jong Lee ),정성민 ( Sung Min Jung ),정명숙 ( Myoung Sook Jung ),김범철 ( Bom Chul Kim ) 한국하천호수학회 2013 생태와 환경 Vol.46 No.2
The species composition of the fish community was studied in four streams where fish kills have previously occurred in recent years; Worun Stream, Seo Stream, Jangnam Stream, and the Anyang Stream. The number of fish species varied from 22 to 86% compared to the number of fish species pre-fish kill. The recovery of fish populations in the streams seems to be determined by water quality and the presence of artificial structures in the streams. The Jangnam Stream, where alkaline pH caused a fish kill, showed a high recovery of fish species due to improvements in water quality. Anyang Stream had a low number of species, possibly because dissolved oxygen concentrations were intermittently low. Artificial structures in streams had a negative impact the recovery of fish species, particularly for benthic fish species. It appears that fish populations can recover rapidly when water quality improves or the movement of fish community is unimpeded. However, water quality and artificial structures in many streams in Korea still present adverse conditions for fish survival, deterring the recovery of fish populations. To conserve fish populations in streams, habitat all owing unimpeded movement for fish and controls on pollutant inputs are needed.
도시 소하천에서 유속, 비표면적에 따른 사상형 부착조류의 Chlorophyll-a 변화
안창혁 ( Chang Hyuk Ahn ),주진철 ( Jin Chul Joo ),이새로미 ( Sae Ro Mi Lee ),오주현 ( Ju Hyun Oh ),안호상 ( Ho Sang Ahn ),송호면 ( Ho Myeon Song ) 한국물환경학회 2013 한국물환경학회지 Vol.29 No.4
The feasibility of water supply as in-stream flow for Mangwall stream was analyzed in terms of water quality and cultivation periphyton using two different types of water resources (e.g., surface water and bank filtration from Han River basin) and three different types of media (e.g., tile, concrete and pebble). The concentrations of organic and inorganic contaminants from the bank filtration were lower than those from surface water by 17.5 ~ 55.0%. Using water samples collected from Mangwall stream, surface water, and bank filtration, chlorophyll-a, phaeopigment, and growth rate of periphyton were investigated. During 30 day incubation for each water sample, it was observed that filamentous cyanobacteria, Oscillatoriaceae, accounted for 98%, and water velocity of 5 cm/s was optimum for the in situ filamentous cyanobacteria growth. Also, it was deducted for water velocity and chl-a to have an inverse correlation. Meanwhile, the greater the specific surface area of media, the higher the concentration of chl-a. From these results, both water velocity and specific surface area of media should be considered as an combined parameter to deter the growth of filamentous cyanobacteria.
연구논문 : 포식압력 하에 치어 보호 구조물이 피식자의 생존율에 미치는 영향에 관한 실험적 연구
안창혁 ( Chang Hyuk Ahn ),주진철 ( Jin Chul Joo ),이새로미 ( Sae Ro Mi Lee ),안호상 ( Ho Sang Ahn ),박재로 ( Jae Roh Park ),송호면 ( Ho Myeon Song ) 한국물환경학회(구 한국수질보전학회) 2013 한국물환경학회지 Vol.29 No.6
The aim of this study was to evaluate artificial fish shelter, which was known to increase prey survival and ex[and habitat space to improve species diversity and fish communities in a freshwater ecosystem. The experiment was performed at an outdoor test-bed for three months from 2011 by comparing the responses to adjustments in the volume of the artificial patch (juvenile fish shelter, JFS) in the control and experimental groups. Analysis of the environmental conditions over two periods (Period 1~2) showed minor differences in the physichemical characteristics of water quality, phytoplankton, and zooplankton biomass, thus, allowing comparative analysis of feeding ecology. However, high water temperature conditions in Period 1 (25.6 ± 2.0℃), affected the predation activity of piscivorous fishes, Coreoperca herzi (C. herzi, size 89 ± 4 mm). Survival rates of the prey fishes, Rhynchocypris oxycephalus (R. oxycephalus, size 29±1 mm), improved as the patch volume increased and were higher than those of the control group by 35.0 ~ 46.7%. Analysis showed that JFS reduced the chances of predator-prey encounter, and thereby minimized prey vulnerability.