The distribution of virioplankton abundance in horizontal and vertical direction was studied by flow cy-tometry, and the relationships with their hosts such as heterotrophic bacteria and picoplankton and environmental factors were also analyzed. Result showed that the virioplankton abundance was (2.22×106)-(1.60×107) ind/ml in autumn in south Yellow Sea and 8.32×106 ind/ml on average. In horizontal direction, virioplankton abundance showed higher abundance in the northeast and the central south of the survey sea area and lower abundance in the southwest. The trend in horizontal distribution of virioplankton abundance was similar with that of heterotrophic bacteria. In vertical direction, virioplankton abundance in surface water layer, middle-level layer and bottom layer was 8.63×106, 7.83×106 and 8.49×106 ind/ml, respectively. The abundance in surface layer and bottom layer has no significant difference but higher than that in middle layer (P<0.05). The correlation analysis showed that virioplankton abundance has positively related to the abundance of heterotrophic bacteria and VBR (P<0.01), and negatively related to Euk abundance (P<0.05), and had no significant correlation with Syn, water depth, temperature, salinity, DO and Chl a (P>0.05).%利用流式细胞仪对南黄海秋季浮游病毒丰度在水平分布和垂直分布上的特征进行了研究,并分析了浮游病毒丰度与异养细菌、微微型浮游植物等宿主丰度以及环境因子的相关性.结果表明,该海区秋季浮游病毒丰度在(2.22×106)-(1.60× 107)ind/ml之间,平均值8.32×106ind/ml.病毒丰度在调查海域的东北和中南部海域出现高值区,在西南部出现低值区,且浮游病毒丰度与异养细菌丰度的平面分布趋势较一致.在表层、中层和底层水体,浮游病毒丰度平均值分别为8.63×106、7.83×106、8.49×106ind/ml,表层和底层丰度无显著差异,但均高于中层(P＜0.05).相关性分析表明,浮游病毒丰度与异养细菌丰度、VBR呈显著正相关(P＜0.01),与微微型真核浮游植物丰度呈显著负相关(P＜0.05),与聚球藻、水深、水温、盐度、溶氧、叶绿素a浓度无明显相关性(P＞0.05).
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