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讨论了中国第六次南大洋考察4条断面1个海湾计30个剖面海水中碘的赋存形式及化学形态的生物地球化学分布。结果表明，表层海水总无机碘含量分有值在0．267－0．443μmol／dm3之间；海水无机碘及碘酸根含量的垂直分布与营养盐关系密切，溶解有机碘分布则较稳定，其含量约为总无机碘的10％。真光层内浮游植物对碘的吸收同化速率为0．17μmol／（m2·d），悬浮有机颗粒中碘的结合量约为4．3μmol／m3，真光层内颗粒碘的下沉速率大于7．2d／m。根据讨论结果提出了测区真光层内碘循环的生物地球化学模式。
Discusses the occurrence pattern of iodine and the biogeochemical distribution of chemical forms in the seawater of 30 sections of a gulf in 4 sections of China’s 6th Southern Ocean. The results showed that the value of total inorganic iodine content in surface seawater was 0.267-0.443μmol / dm3. The vertical distribution of inorganic iodine and iodate content in seawater was closely related to nutrients, while the dissolved organic iodine was more stable The content is about 10% of the total inorganic iodine. The absorption and assimilation rates of iodine by phytoplankton in the euphotic layer were 0.17μmol / (m2 · d), the binding amount of iodine in suspended organic particles was about 4.3μmol / m3, and the iodine particle sinking rate in the euphotic layer was more than 7. 2d / m. According to the results of the discussion, the biogeochemical model of iodine cycle in the true photopic zone of the survey area is proposed.