http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 곽희상 ( Jin Hwan Lee (검색결과 1 건)
- 무료
- 기관 내 무료
- 유료
-
이진환,곽희상 ( Jin Hwan Lee,Hi Sang Kwak ) 한국하천호수학회 1987 생태와 환경 Vol.20 No.1
The purpose of this study are not only to scrutinize the water quality due to environmental change but also to clarify the phytoplankton community in the Youngrang Lake. Firstly, environmental study have carried out from the surface and the bottom layer at five stations of this lake during the periods from June to August 1986. Water temperature ranged uniformly from 20.5℃ to 22.5 ℃ in the surface and that of bottom were low of 2.9-4.8 ℃ . Salinity was varied from 0.78‰ to 1.94‰ and it was thought that Youngrang Lake was changed from brackish lake to freshwater lake. Secchi disc transparency changed from 0.5 m to 1.0 m. Dissolved oxygem concentrations showed 6.1-9. 1 mg/l in the surface, but those of bottom were little or anoxic conditions. The pH value showed a great fluctuations due to the river discharge and decreased gradually by months. Especially surface pH were almost lower than those of bottom except station 1. The former was thought of depending the increasing of phytoplankton photosynthesis, but the latter was thought to effect H₂S reduction. Chlorophyll-α concentrations varied from 26.82 mg/m³ to 90.69 mg/m³ in the surface and from 14.30 mg/m³ to 51.75 mg/m³ in the bottom. It could be pointed out hypereutrophication lake from the viewpoint of the standard value of eutrophication by Yoshida (1973). Nitrate, nitrite, phosphate and silicate concentrations have increased from year to year and also have kept water pollutions to be excessing of eutrophication.
코리아스칼라연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
