二百年来黄海浮游植物群落结构变化的生物标志物记录

Biomarker Records of Phytoplankton Community Structure Changes in the Yellow Sea over the Last 200 Years

对位于南黄海的柱状样10694进行了生物标志物分析,利用其生物标志物含量及比例变化重建了黄海过去210a来的浮游植物生产力及群落结构变化。结果表明10694站位在过去100a来生产力有上升的趋势,而这种趋势在过去40a来尤为明显,浮游植物群落结构在过去100a中有硅藻比例上升-甲藻比例下降的趋势。通过与近期历史资料的对比,得出初步结论:黄海过去100a生产力上升及硅藻比例增加主要是与东亚冬季风和ENSO增强有关。结果表明,可以用生物标志物法重建过去百年来中国近海生态变化,并可以初步区分自然气候变化和人类活动对近海生态系统演变的影响。

A suite of biomarkers were analyzed in core 10694 from the Yellow Sea to reconstruct changes of phytoplankton productivity and community structure over the last 200 years. The results indicate increasing phytoplankton productivity during the last 100 years, especially for the last 40 years, and increasing relative contribution of diatoms but decreasing relative contribution of dinoflagellates over the last 100 years. By comparison with previous investigation data, it is proposed that increasing phytoplankton productivity and relative contribution of diatoms were mainly a result of strengthened East Asian Winter Monsoon and ENSO which increased upwelling and mixing of the water column. In addition, our results indicate biomarker can be used to reconstruct the variations of phytoplankton community structure of the marginal seas in China over the last 100 years and primarily discriminate the effects between climate change and human activity on the phytoplankton community structure.