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낙동강 물금 지점의 겨울 및 봄철 식물플랑크톤 생물량에 대한 기후변화 영향
정승현 ( Seung Hyun Joung ),박혜경 ( Hae Kyung Park ),이혜진 ( Hae Jin Lee ),이수형 ( Soo Hyung Lee ) 한국물환경학회 2013 한국물환경학회지 Vol.29 No.2
To confirm the relationship between climate change and Stephanodiscus in Mulgeum station of Nakdong River, Korea, this study was conducted. The temperature in crease by climate change was observed in the study site, where the temperature was gradually increased in most seasons, except for summer season. The mass proliferation of Stephanodiscus constantly appeared in every year, especially between November and March, and when Stephanodiscus abundance was above 90% in phyto plankton biomass. Among this period, phytoplankton biomass was high related with water temperature r2=0.249, p<0.01 than nutrient factors such as nitrogen and phosphorus in the study site. Finally, temperature by climate change can be regarded as the affecting factor for ch1.a variation, because temperature was strongly related with water temperature r2=0.748, p<0.01. From 1997 to 2010, the annual maximum phytoplankton biomass was recorded in the rang of temperature from 4.8 to 8.4, and the range was regarded as the temperature condition for the optimal growth of Stephanodiscus in the study site. On the optimal growth temperature, the trend of monthly average temperature correspondded to the trend of ch1.a variation from November to March. In future, the increase of temperature by climate change can prolong Stephanodiscus blooming period in winter and spring seasons.
정승현 ( Seung Hyun Joung ),안치용 ( Chi Yong Ahn ),최애란 ( Ae Ran Choi ),장감용 ( Kam Yong Jang ),오희목 ( Hee Mock Oh ) 한국환경생물학회 2005 환경생물 : 환경생물학회지 Vol.23 No.1
2001, 2003년의 7월부터 10월까지 대청호에 위치한 댐 지역에서 식물플랑크톤 군집, 환경요인 및 강우량을 조사하였다. 조사 기간동안의 월평균 강우량은 2001, 2003년 각각 91.3, 265.3 mm로 조사되었다 최대 Chl. α의 농도는 2001, 2003년 각각 45.4, 131.5 μg L^(-1)로 조사되었다. 남조류 세포수는 2003년 최대 49,000ce11s mL^(-1)로 조사되었고, 2001년은 최대 200,000cells mL^(-1) 이상으로 조사되었다. 그리고 식물플랑크톤 군집에서 남조류의 상대 풍부도는 2001년 97%, 2003년 74%였다. 2001년은 Microcystis spp.가 조사기간동안 우점종으로 조사되었고, 2003년은 Oscillatoria spp., Phormidium spp., Chroococcus spp. 그리고 Microcystis spp. 순으로 우점종의 변화를 보여줬다. 결론적으로 강우량은 식물플랑크톤의 종 다양성 및 수화현상을 일으키는 남조류 세포 밀도에 영향을 주었다. The phytoplankton community, environmental factors, and rainfall were investigated from July to October in 2001 and 2003 on Dam site in Daechung Reservoir. The monthly average rainfall in the investigated period were 91.3 and 265.3 mm in 2001 and 2003, respectively. The maximum chlorophyll a concentration was observed higher at 131.5 μg L^(-1) in 2003 than at 45.41 μg L^(-1) in 2001. The cyanobacterial number in 2001 was counted up to over 200,000 cells mL^(-1), which was much higher than the maximum number of 49,000 cells mL^(-1) in 2003. The relative abundance of cyanobacteria in the phytoplankton community was about 97% in 2001 and 74% in 2003. Microcystis spp. were absolutely dominant species in 2001, while a couple of cyanobacteria such as Oscillatoria spp., Phormidium spp. Chroococcus spp. and Microcystis spp. were dominant species in 2003. Consequently, it seemed that rainfall affected the diversity of phytoplankton species and decreased the density of bloom-forming cyanobacteria.
정승현 ( Seung Hyun Joung ),박혜경 ( Hae Kyung Park ),윤석환 ( Seok Hwan Yun ) 한국물환경학회 2012 한국물환경학회지 Vol.28 No.2
Organic matters budget in Lake Hoengseong were monthly investigated from April 2009 to November 2009. The intense rainfall occurred at between July and August and the hydrological factors were highly varied during the rainfall season. By the concentrated rainfall, the elevation, influx and efflux were sharply increased and the turbid water was also flowed into the middle water column in Lake. The inflow of turbid water increased the nutrient concentrations in water body and this appears to stimulate of phytoplankton regard as the primary productivity of influx of organic matter. Monthly average concentration of dissolved organic carbon (DOC) was generally higher than the particulate organic carbon (POC) concentration in Lake, but Temporal and spatial variation of POC concentration was higher than DOC and the maximum POC concentration was recorded in surface water in August, had the highest phytoplankton biomass. Organic carbon concentration in inflow site was rarely changed during the dry season, but the concentration was rapidly increased by the initial intense rainfall. In organic matters budget, the most of the organic matters was inflowed from the inflow site at rainfall season. Especially, the influx of allochthonous organic matters during the intense rainfall was 72.4% in the total influx organic matters.