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《ACTA SCICENTIARUM NATURALUM UNIVERSITIS PEKINESIS》 1997-02
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Vertical Distribution of Light Intensity and Light Compensation Depth of Submerged Macrophyte in Lake Dianchi

REN Jiuchang ZHOU Hong SUN Yitong (National Joint Key Laboratory of Environmental Simulating and Pollution Control, Laboratory of Water Environmental Simulating, Center for Environmental Sciences, Peking University, Beijing, 100871)  
Studies were made on the transparency, the vertical distribution of light intensities and the light compensation depth of submerged macrophyte at the 15 monitoring sections in Lake Dianchi. The transparency in Caohai(the interior of Dianchi) and the exterior of Dianchi were respectively 25 ̄30 cm and 35 ̄40 cm. At the every section, the light intensity decline as the depth increases, showing negative index correlation, its general formule being I t=I 0 e -αt . The light compensation depth of submerged macrophyte in Caohai and the exterior of Dianchi were less than 100 cm and 150 cm respectively, much shallower than the actual water depth. The transparency is linear possitive correlation with the light compensation depth in Lake Dianchi. The values of transparency necessary to restore the biodiversity of submerged macrophyte at different depths are also reprorted in this study.
【CateGory Index】: X171
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