• 한국해양학회지
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• 제25권1호
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• pp.1-7
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• 1990

동해 서남해역의 상부 125미터 수층을 대상으로 1981년 9월부터 1984년 10월에 걸 쳐 6회의 현장조사를 실시하여 841개의 해수시료를 구하였고, 이들의 수온, 염분, 무 기영향염류 및 식물플랑크톤 종별 현존량에 대하여 연구하였다. 도합 235종류의 식물플랑크톤을 동정하였으며, 이 가운데 Cylindrothecqa closterium 과 Nitzschia delicatissuma 등의 두 종이 최고의 공통종인 동시에 우점종으로 나타났다. 연구해역 상부혼합 층 시료 중의 식물플랑크톤 현존량과 수온, 염분 및 무기영양염류 등의 환경 요인과의 관계를 다중회귀 분석한 결과 봄에는 수온의 회귀상수가 염분에 비해 1.6-4.2배 컸으며, 반대로 가을에는 염분의 회귀상수가 수온에 비해 2.1-3.4배 크게 나타났다. T-S diagram 위에서 식물플랑크톤 현존량 분포가 봄에는 수온 변화에 민감 하였으며 가을에는 염분 변화에 민감하였고, 도식적으로 T-S diagram 상에 표시한 높 은 현존량 구역은 계절적으로 순환하는 양상을 나타내었다. 이는 연구해역의 식물플랑 크톤 현존량 분포가 여타가 여타의 환경요인보다 특별히 해양물리학적 특성과 긴밀한 관계가 있음을 의미한다.

• The Korean Journal of Ecology
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• 제9권3호
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• pp.161-184
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• 1986

An experiment was made in order to analyze the growth characteristics and productivity of Zoysia japonica under control, mowing and TIBA treatment conditions at the experimental farm of Kyung Hee univ. from May 26 to Oct. 1 in 1985. The field was planned by the randomized block design method and each treatment was given to three plots (2${\times}$2, 4${\times}$4 and 10${\times}$10 cm) and was replicated three times. Each plot was 1$m^2$ for Zoysia japonica. The sampling of each plot was taken once a week after sowing. In order to know the dry matter of total standing crops, kept 9$0^{\circ}C$ and weighted each organ of the plants. Total leaf area of a plant was measured by drawing method. The author adopted the growth analysis of English School. The increasing rates of numbers of leaf and stem were remarkably high in each plot between 10th and 12th weak after sowing and it was highest in TIBA treated plot. The increasin rate of leaf area in each plot was remarkably high beween 10th and 12th week and the maximum value of leaf area was 274.00c$m^2$ in TIBA treated plot of 100 plants/$m^2$. The increasing rate of standing crop was remarkably high between 10th and 12th week and the high increasing tendency in TIBA plot resulted from TIBA. The positive correlationship was founded between standing crop and leaf area. The evaporation rather than temperature acted as a main factor of negative correlation with standing crop during the experiment period. Solar radiation had a high positive correlation in the lower density of plot. C/F ratio was low, during the growth period, from 10th to 12th week after sowing and was low in the higher density under each treated plot. T/R ratio was not constant during the sampling period but was high in the lower density. The increasing rates of RGR and NAR were high between 11th and 12th week after sowing. Leaf area ratio was high in higher density in each plot and not constant in all treated plot.

• 한국작물학회:학술대회논문집
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• 한국작물학회 1991년도 춘계 학술대회지
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• pp.36-37
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• 1991

• ALGAE
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• 제20권3호
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• pp.197-205
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• 2005

Temporal variability in lake phytoplankton is controlled by a complex between hydrological and chemical factors, and biological interactions. We explored annual change of phytoplankton in Lake Daecheong, using phytoplankton analysis data from 1997 to 2002 (except 2000). The standing crop of phytoplankton was ranged from 3.5 x 10 to 1.5 x 106 cells mL$^{-1}$ and the highest mean value was at site 1. The class composition ratios of phytoplankton standing crop were divided into three classes. From January to March, diatoms showed a dominance (68.1-77.7%). From April to June, diatoms were mixed with cryptomonad etc. or blue-green algae. From July to October, blue-green algae showed a dominance (54.7-84.0%). In the case of green algae, the class composition ratios were below 10%. But green algae appeared all the year round.

• Journal of Plant Biology
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• 제11권4호
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• pp.30-36
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• 1968

The vascular flora of grasslands in Mt. Kumhak, Moonheri, Sungilkyo and Kosukjong area located at Chulwon were composed of 54, 57, 45, and 39 species, the most impotant of which were Arundinella hirta and Miscanthus purpurascens. These two species contributed greatly to the standing crop of live material was in excess of 142g/$m^2$ throughout the growing season. The peak standing crop of 332.4g/$m^2$ was reached in July under flooded conditions largely as a result of the growth of Miscanthus Purpurascens and Arundinella hirta. The net production of organic matter occurred largely throughout the growing season. The net productivity of the vascular component of community was in excess of 27.3g/$m^2$ for one growing season.

• 한국환경생물학회:학술대회논문집
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• 한국환경생물학회 2002년도 춘계공동학술대회 및 심포지움 초록집
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• pp.61-61
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• 2002

• ALGAE
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• 제17권3호
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• pp.171-185
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• 2002

The standing crop of genus Microcystis, microcystin concentrations and environmental factors were monitored at stations of the lower reaches of the Nakdong River in 1998 and 1999 during the periods of its occurrence. The Microcystis were observed from May to Octorber, and the cell density was highest at Station Seonam up to 250,000 cells${\cdot}ml^{-1}$ forming scum over the water surface. There were signigicant relationships between the standing crop of Microcystis and nitrate nitrogen, total phosphorus concentrations and Ph. Presumably these parameters were important in the succession to Microcystis dominated phytoplankton community in the summer period in the river. However, Ammonium nitrogen, phosphate phosphorus concentrations and N/P ratio were not critical factors. The Microcystis bloom was notable above $25^{\circ}C$ of surface water temperature. Microcystins were detected from May to November in the algal materials from the river. The 84.2% of algal materials with Microcystis exhibited the microcystin with the maximum of 1711.8 ${\mu}g{\cdot}g^{-1}$ dw. The microcystin concentrations in the algal materials were significantly related to the stading crop of Microcystis, which was the primary determinant factor in the toxin levle of algal materials. The concentrations were also significantly related to pH of the water column in the positive pattern.

• 한국초지조사료학회지
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• 제5권1호
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• pp.8-12
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• 1985

낙동강하류(洛東江下流)의 순(純)갈대초지(草地)에 있어서 현존량(現存量)의 계절적(季節的) 변화(變化), 최대현존량(最大現存量)의 년별변화(年別變化), 물질생산구조(物質生産構造)의 계절변화(季節變化) 및 년순생산성(年純生産性)을 평가(評價)한 결과(結果)는 다음과 같다. 1. 순갈대초지(草地)의 최대현존량(最大現存量)은 9월(月) 중순(中旬)에 나타났으며 평균(平均) 최대일물질생산성(最大日物質生産成)은 6월(月)과 7월(月)사이로 $32.7g/m^2/day$ 였다. 2. 순갈대초지(草地)의 엽면적지수(葉面積指數)는 4월(月)부터 점차 증가하여 7월(月)에 최대치(最大値)(10.5)에 이르고 다시 감소하였다. 3. 지상부(地上部)의 초장(草長)은 9월(月) 중순(中旬)에 320cm로 최대(最大)에 이르며 길이생장(生長)이 완료(完了)됨을 알 수 있었다. 4. 순갈대초지(草地) 년순생산성(年純生産性)은 $3,399g/m^2/year$로 안정(安定)된 초지군락(草地群落)을 형성(形成)하고 있다는 것을 알 수 있었다. 5. 순갈대초지(草地)의 물질생산구조(物質生産構造)는 협엽형과 광엽형의 중간형으로 초지(草地)가 성숙함에 따라 잎의 분포(分布)가 상층부(上層部)에 집중하는 현상을 나타내었다.

• 한국물환경학회지
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• 제26권1호
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• pp.104-110
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• 2010

Eutrophication is a well-known phenomenon in lentic habitats, however it is receiving increasing attention in shallow streams of Korea due to the increase of periphyton to a nuisance level. In this study temporal and spatial variation in periphyton standing crop and nutrient concentrations were surveyed in the upper reach of the Han River (the Inbuk Stream) that used to be a pristine rural stream until 1980s. Chlorophyll-a concentration per unit surface area of bottom substrate was examined monthly for one year period at nine sites along the Inbuk Stream together with environmental factors such as phosphorus, nitrogen, and water velocity. The standing crop of periphytic algae ranged from $4{\sim}242mgChl.a/m^2$ with a median of $55mgChl.a/m^2$, often exceeding the nuisance level criterion. Along the stream periphyton increased significantly from $39{\pm}48mgChl.a/m^2$ to $94{\pm}49mgChl.a/m^2$ after merging of a tributary in an intensive agricultural basin with high phosphorus concentrations. Seasonally periphyton biomass was highest in autumn (median $171{\pm}76mgChl.a/m^2$) from October through December when water flow velocity was low (median $0.4{\pm}0.3m/s$), while it was higher in flood season (median $1.2{\pm}0.4m/s$) and freezing season (median $0.2{\pm}0.3m/s$) was lower. The result shows that this rural stream often shows characteristics of eutrophication according to periphyton standing crop and it may be regulated by phosphorus and water velocity.

• The Korean Journal of Ecology
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• 제14권1호
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• pp.63-73
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• 1991

洛東江 河口堰 건설 이후의 干濕地 植生의 변화를 알기 위하여 식생의 분포와 生産性 및 現存量을 조사하여 河口堰 건설 전과 비교한 결과 다음과 같은 결과를 얻었다. 干濕地 I지소의 상부에 草丈이 길고 密度가 높았던 군락(1985.7)이 草丈과 密度가 낮아졌으며, 하부에 개척자 단계의 세모고랭이 군락이 확장되고 密度와 草高 및 現存量이 증가하였다. 干濕地 II지소의 자연제방 부분에 사토가 퇴적되어 확장되고 干濕地面이 높아졌다. 동쪽부분(sandy area)의 세모고랭이 군락은 증가하고 중앙부(muddy area)의 세모고랭이는 쇠퇴되어 現存量이 감소하였다. 서쪽부분의 干濕地(sandy area)는 확장되고, 증가되었다. 河口堰 건설공사 동안 밀도, 초간, 현재량 및 一次純生産量은 심한 변동을 나타내었으며, 공사초기(1984)에 비해 공사 이후 1988년, 1989년의 총현존량(total standing crop)과 괴경의 현존량은 증가하였으나, 1990년에는 1989년보다 약간 감소하였다. 세모고랭이 塊莖의 現存量을 철새들이 도래하기 시작하는 10월을 중심으로 河口堰工事 前(유, 1987)과 河口堰건설 이후를 비교하면 1983년 부터 '84, 85년까지 증가하였으며, 1986년에는 급격히 감소하여 '83년의 81%수준이었다. 완공후의 1988년에는 1983년보다 높은 0.79g DW${\cdot}m^{-2}$으로 83년의 159%로 증가되었으며, '89년에는 폭발적으로 증가하였고 '90년에는 '89년보다 약간 감소하였다.