On the absorptive characteristics of Microcystis and Scenedesmus

cje ›› 2005, Vol. ›› Issue (7): 768-772.

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On the absorptive characteristics of Microcystis and Scenedesmus

WU Shengcai^1,2,3, ZHANG yunlin^1,2, CHEN Weimin ¹

1. Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;
2. Graduate School of Chinese Academy of Sciences, Beijing 100039, China;
3. Yancheng Teachers College, Yancheng 224002, China

Received:2004-03-05 Revised:2004-05-08 Online:2005-07-10

Abstract

Abstract: The diffuse attenuation coefficient (K_d) of 6 densities of Microcystis and Scenedesmus cell media were measured in simulative column indoor.The specific absorption coefficient (SAC) and the contribution of cell to total K_d were calculated after testing the content of chla.The absorption coefficient of dissolved organic carbon (DOC) was derived from the conversion of absorbance value in spectrophotometer.The result indicated that the spectrum characteristic of 2 kinds of algal cell in higher densities was similar and the K_d at 3 higher density of both algae had the same trend.The contribution to K_d was 84.95% (Microcystis) and 88.15% (Scenedesmus), respectively.Their mean SAC in 3 higher densities demonstrated parallel spectrum property.There were two obvious peaks in 380～500nm and 660～690nm with the corresponding peak values 0.1118,0.0413(m²·mg^-1chla) at 435 nm and 0.075,0.032(m²·mg^-1chla) at 670 nm.Scenedesmus cell has much higher SAC than Microcystis cell.The mean SAC of 3 densities of Scenedesmus in 340～800 nm was 0.0573(m²·mg^-1 chla),while that of Microcystis was 0.0234(m²·mg^-1 chla).The ecological significance of the differences and the potential utilization in remote sensing monitoring were discussed.

Key words: Phosphorus loss, Simulated rainfall, Slope land, Soil tillage, Soil compaction

CLC Number:

Q178.51

WU Shengcai, ZHANG yunlin, CHEN Weimin . On the absorptive characteristics of Microcystis and Scenedesmus[J]. cje, 2005, (7): 768-772.

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On the absorptive characteristics of Microcystis and Scenedesmus

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