Abstract:In the early December, 2009, a dinoflagellate bloom caused by Peridiniopsis sp. was found for the first time in Longtan Lake, which is located in Long Kong Dong water-eroded cave scenery spot, Longyan City, Fujian Province. The cell density of the dinoflagellate reached as high as 1.11×107cells/L during the bloom. By a series of urgent disposal procedures, the blooming dinoflagellate as well as other microalgae was eventually eliminated, after which investigations were instantly carried out to explore the cause of the bloom. Nutrients concentrations in the upstream rivulet and the cave underground water did not exceed the levels of Class II water in National Criteria for groundwater water quality, but markedly increased in the lake water, especially the concentrations of TN and TP. Thus it was suggested that nutrient accumulation, hence the proliferation of dinoflagellate, had been accelerated due to the alteration of rivulet flow pattern by water impoundment in Longtan Lake, and therefore mainly accounting for the bloom event. Moreover, an unexpected temperature increase in the lake water right before and during the bloom may to some extent help to explain the bloom occurrence. The results indicated that endogenous release of nutrients accumulated in lake sediments had made great contribution to the outbreak of the dinoflagellate bloom, and TP might be a primary restriction factor for the bloom.
边归国, 刘国祥, 陈克华. 福建龙岩市龙潭湖甲藻水华成因的研究[J]. 中国环境科学, 2010, 30(12): 1678-1682.
BIAN Gui-Guo, LIU Guo-Xiang, CHEN Ke-Hua. The possible cause of a dinoflagellate bloom occurring in Longtan Lake.. CHINA ENVIRONMENTAL SCIENCECE, 2010, 30(12): 1678-1682.