• 한국환경과학회지
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• 제10권1호
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• pp.41-45
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• 2001

This study was carried out to investigate phytoplankton community structure in the Naktong river from January to December in 1999. In water quality, average value of pH were 8.1, BOD 2.5mg/$\ell$, COD 5.0mg/$\ell$, Chl-a 41$\mu\textrm{g}$/$\ell$, and $NH_4^+-N$ 0.08mg/$\ell$, respectively. Phytoplankton were identified 42 genera 76 species. Among these, diatoms were 39 species(51.3%), green algae 25 species(32.9%), cyanobacteria 4 species(5.3%), dinoflagellates 4 repectively. The highest standing crops were 33,023 cells/$m\ell$ in February at the Mulgum and the lowest 79 cells/$m\ell$ in March at the Goryung. Also, Standing crops were increased with proceeding from middle part to lower part. Seasonal succession of phytoplankton represented that Stephanodiscus hantzschii was dominant species in winter, Cyclotella menaghiniana and Synedra acus in spring, C. meneghiniana, S. acus, Aulacoseira granulata var. angustissima in summer, and A. granulata var. angustissima and C. meneghiniana in autumn. Ecological important species were 4 species, that are Stephanodiscus hantzschii, Cyclotella meneghiniana, Synedra acus, and Aulacoseira granulata var. angustissima. In the community analysis, dominance indices ranged from 0.434(August, Namji) to 0.999(January, February, Mulgum) and diversity indices from 0.026(February, Mulgum) to 3.073(September, Namji). According to the similarity index among the stations, it was generally defind as two areas such as middle(Goryung, Namji and Samryangjin) and lower part(Mulgum).

• 생태와환경
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• 제39권1호통권115호
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• pp.138-144
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• 2006

조류성장잠재력의 검정 (AGPT)은 수생대계에서의 생물학적 생산잠재력을 평가하는 유용한 도구로 이용되어왔다. 본 연구는 낙동강 유역에 위치하는 대형 인공호들과 낙동강 본류의 상하류에 해당하는 몇 개 지점에서 조류성장잠재력을 비교하였다. AGPT의 공시조류로 Microcystis aeruginosa을 이용하였고 2003년 2월부터 9월까지 갈수기와 풍수기를 포함하여 계절에 따라 4회 분석하였다. 낙동강 유역에 위치한 인공호들의 AGP는 하천과 비교하여 매우 낮게 나타났다. 하천구간에서는 대체적으로 도시하천과 근접한 상류에서 높고 하류로 갈수록 감소하는 양상을 보였으나 하계에 유입량이 급증한 직후에는 상하류 간 차이가 크게 감소하였다. 낙동강 유역의 인공호, 강 및 하구호의 수질은 갈수기에 더욱 악화되었고 이 시기에 AGP값도 높게 나타났다. AGP는 시공간적으로 변화 폭이 컸고 수중 영양염 수준과 매우 밀접한 관계를 보였다. 특히, AGP는 영양염 중 인과 상관성이 가장 높아 낙동강의 조류 생장에 인의 영향이 가장 큰 것으로 추정되었다. 본 연구의 견과는 AGPT가 조류 생장에 대한 제한영양염 판정 뿐만 아니라 수중 fertility를 평가함에 있어 유용한 도구로 사용한 수 있음을 제시한다.

• 미생물학회지
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• 제32권3호
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• pp.238-244
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• 1994

부영양화된 낙동강 하구역에서 세균에 의한 용존 유기물의 이용능을 조사하고 이에 미치는 환경요인의 영향을 파악하기 위하여 미생물학적 요인과 물리화학적 환경요인의 연중 변화를 분석하였다. 총세균수는 0.33 ~ $2.09{\times}10^7$ cells/ml의 변화폭을 나타냈으며, 오염부하량이 큰 정점에서 종속영양세균의 개체수와 비례하였다. 세균이 체적과 생물량은 각각 0.064~0.156 ${\mu}m^3$/cell, 0.163~1.036 ${\mu}g$-C/ml을 나타냈다. 세균의 이차생산성은 0.24~60.86 ${\mu}g$-C/l/h의 범위로 측정되었으며, 부영양화 지표로 사용되는 환경인자와 밀접한 관계를 보였다. 담수역에 속하는 정점에서의 세균생산성의 계절별 변화는 동계에 최고치를, 하계에 최저치를 나타내어 갈수기의 오염부하량 증가와 밀접한 상관성을 보였다. 해수역에 속하는 다대의 경우 동계에 낮은 값을, 하계에 높은 값을 나타내고, 환경요인 중 엽록소 a, 수은 등과 밀접한 상관성을 보였다 (r>0.5, p<0.05). 이로 미루어 낙동강 하구의 하구언 상류역에서는 주위에서 유입되는 유기물이, 하구언 하류역에서는 식물성 플랑크톤의 광합성 산무링 세균의 이차생산성에 미치는 주 영양물질임을 암시하고 있다.

• 미생물학회지
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• 제29권5호
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• pp.329-338
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• 1991

From July 1985 to December 1986, 28 variables of phycal-chemical factors, bacteria and heterotrophic activity were investigated 17 times at 3 stations in the estuary of Naktong River and the influences of environmental factors to bacterial population and heterotrophic activity were analyzed through multiple regression. The results of multiple regression were as follows. At station 1, total bacteria and heterotrophic bacteria(Z-25) could explain 57% of the variation of maximum uptake velocity for glucose and 54% of turnover time for glucose was explained by total coliform bacteria and MBOD, Sixty four percent of the variation of Kt+SN was accounted for salinity, MBOD-N and inorganic phosphate. Turnover rate for acetate was also accounted for the change of MBOD-P by 56%. At station 2 maximum uptake velocity for glucose depends on MBOD-N by 81%; turnover time on bacteria by 50%; Kt+Sn on avilable nutrient by 61%. More than 50% of maximum uptake velocity and turnover time for glucose were influenced by bacteria and that of Kt+Sn by the change of nutrient in the surface water of station 3. In the bottom water of station 3, the change of maximumuptake velocity, turnover time and Kt+Sn for glucose was controlled by total bacteria and available nutrient, bacteria, the change of nutrient salts respectively. On the whole, more than 50% of maximum uptake velocity and turnover time for glucose could be due to the change in the number of bacetria and the value of Kt+Sn was affected by the change of nutrient salts. Turnover rate for acetate was controlled by available phosphate at station 1 and by bacteria at station 2 and 3, which showed a distinct difference between the environmental factors which govern the rate of glucose and acetate uptake in the Naktong esturine ecosystem. And bacterial communities were controlled by available nutrients at station 1, by nutrient salts and salinity at station 2 and in the surface water of station 3 and by salinity in the bottom water of station 3.

• 대한원격탐사학회지
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• 제3권1호
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• pp.11-23
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• 1987

본 연구는 LANDSAT MSS 및 TM 영상자료를 이용하여 낙동강 하천수가 유입, 확산되는 과정을 시간적, 공간적으로 추적조사하여, 이들이 해양환경에 미치는 영향을 구명하는데 중점을 두었다. 본 연구로부터 현탁물질량의 농도는 고분도와 같이 계절, 대.소조기, 창.낙조류, 강우량에 따라 큰 변동을 가져오며, 연안전선의 형성 및 분포에 대한 시간적, 공간적인 변동상태를 광역적으로 추적할 수 있었고 해안선, 퇴적형, 천해역의 해저지형 변동조사는 기존의 해도 및 육도를 최신화할 수 있는 정보로써 위성자료의 가치가 크다는 결론을 얻었다.

• 한국생태학회:학술대회논문집
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• 한국생태학회 1999년도 국제 Symposium 및 '99 춘계 공동 학술 발표대회
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• pp.75-75
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• 1999

• 한국환경과학회:학술대회논문집
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• 한국환경과학회 1996년도 가을 학술발표회 초록집
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• pp.65-65
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• 1996

• The Korean Journal of Ecology
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• 제14권3호
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• pp.345-360
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• 1991

Benthic macroinvertebrates were collecte in the middle reaches of the paenae stream, a tributary of th naktong river in korea, in four seasons from August 1989. To may 1990, during the study period, 125 species, 81 genera and 41 families were collected. Overall, the most dominant species was lepidostoma sp. 1 followed by heptagenia kihada, neoperla quadrata, diamesa sp. 1, ect.. the community was most diverse in autumn, However the number of collectd individuals was highest in winter. Species of chironomids including diamesa sp. 1 and mayflies including paraleptophlebia chocorata were collected exceptionally in a large number in winter. Seasonal occurrence of funtional groups such as collectors, shredders and scrapers was related with the availadlity of food sourses in the stream. The abundance of predators was relatively stable in four seasons with 17% on average. Diversity, tbi and chandler's biotic score(bs) in the paenae strem were 3.75, 14.5, and 100 on average, respectively. Based on biological and chemical indices the paenae stream was clean in the range of xeno- and oligo- saprobity.

• The Korean Journal of Ecology
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• 제14권4호
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• pp.399-413
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• 1991

Benthic macroinvertebrate communities and environments at the upper and lower sites of levees in the middle reaches of paenae stream, a tributary of the naktong river,were investigated in four seasons from August 1989 to may 1990. Current velocities were significantly fast at the loer sites than the upper sites of levees. Substratum compositions were also different between these two sites. Abundances of major species of benthic macroinvertebrates occurring in four seasons were primarily dtermined by temperature. in each location of levees, however, current velocities and substratum particle sizrs were important in determining species were generally higher than upper sites of levees. Biological indices were also high at the lower sites of levees. diversity, evenness and dominance indices were positively correlated with the quantity of the middle-sized large pebbles(3∼5cm in diameter) in stream bed.

• 한국동물학회:학술대회논문집
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• 한국동물학회 1998년도 한국생물과학협회 학술발표대회
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• pp.191.1-191
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• 1998

No Abstract, See Full Text