| DUAN Shanshan,XING Lei,ZHANG Hailong,FENG Xuwen,YANG Haili,ZHAO Meixun. 2014. Upwelling and anthropogenic forcing on phytoplankton productivity and community structure changes in the Zhejiang coastal area over the last 100 years. Acta Oceanologica Sinica, 33(10):1－9 |
| Upwelling and anthropogenic forcing on phytoplankton productivity and community structure changes in the Zhejiang coastal area over the last 100 years |
| 过去100年来闽浙泥质区浮游植物生产力和群落结构在上升流和人类活动影响下的变化 |
| Received:October 24, 2013 Revised:March 24, 2014 |
| DOI：10.1007/s13131-014-0535-1 |
| Key words:biomarkers phytoplankton community structure Min-Zhe coastal mud area Changjiang Diluted Water upwelling |
| 中文关键词: 生物标志物 浮游植物群落结构 闽浙泥质区 长江冲淡水 上升流 |
| 基金项目:The National Basic Research Program of China (973 Program) under contract No. 2010CB428901; the National Natural Science Foundation of China under contract Nos 41020164005, 40976042 and 41076036. |
| Author Name | Affiliation | E-mail | | DUAN Shanshan | Key Laboratory of Marine Chemistry Theory and Technology (Ocean University of China), Ministry of Education, Qingdao 266100, China
Qingdao Collaborative Innovation Center of Marine Science and Technology, Qingdao 266100, China | | | XING Lei | Key Laboratory of Marine Chemistry Theory and Technology (Ocean University of China), Ministry of Education, Qingdao 266100, China
Qingdao Collaborative Innovation Center of Marine Science and Technology, Qingdao 266100, China | | | ZHANG Hailong | Key Laboratory of Marine Chemistry Theory and Technology (Ocean University of China), Ministry of Education, Qingdao 266100, China
Qingdao Collaborative Innovation Center of Marine Science and Technology, Qingdao 266100, China | | | FENG Xuwen | Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | YANG Haili | Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | ZHAO Meixun | Key Laboratory of Marine Chemistry Theory and Technology (Ocean University of China), Ministry of Education, Qingdao 266100, China
Qingdao Collaborative Innovation Center of Marine Science and Technology, Qingdao 266100, China | maxzhao@ouc.edu.cn |
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| Abstract: |
| Phytoplankton productivity and community structure in marginal seas have been altered significantly during the past three decades, but it is still a challenge to distinguish the forcing mechanisms between climate change and anthropogenic activities. High time-resolution biomarker records of two 210Pb-dated sediment cores (#34: 28.5°N, 122.272°E; CJ12-1269: 28.861 9°N, 122.515 3°E) from the Min-Zhe coastal mud area were compared to reveal changes of phytoplankton productivity and community structure over the past 100 years. Phytoplankton productivity started to increase gradually from the 1970s and increased rapidly after the late 1990s at Site #34; and it started to increase gradually from the middle 1960s and increased rapidly after the late 1980s at Site CJ12-1269. Productivity of Core CJ12-1269 was higher than that of Core #34. Phytoplankton community structure variations displayed opposite patterns in the two cores. The decreasing D/B (dinosterol/brassicasterol) ratio of Core #34 since the 1960s revealed increased diatom contribution to total productivity. In contrast, the increasing D/B ratio of Core CJ12-1269 since the 1950s indicated increased dinoflagellate contribution to total productivity. Both the productivity increase and the increased dinoflagellate contribution in Core CJ12-1269 since the 1950-1960s were mainly caused by anthropogenic activities, as the location was closer to the Changjiang River Estuary with higher nutrient concentration and decreasing Si/N ratios. However, increased diatom contribution in Core #34 is proposed to be caused by increased coastal upwelling, with higher nutrient concentration and higher Si/N ratios. |
| 中文摘要: |
| 过去30年我国边缘海浮游植物的生产力和群落结构发生了明显变化，但如何区分气候变化和人类活动之间的强迫机制仍是一个挑战。本文通过对比两个210Pb定年的高时间分辨率生物标志物记录的沉积物岩心(#34，28.5oN，122.272oE；CJ12-1269，28.8619oN，122.5153oE)揭示了浮游植物生产力和群落结构在过去100年的变化。#34站位浮游植物生产力从1970s开始上升，1990s末迅速增加；CJ12-1269站位浮游植物生产力从1960s中期开始上升，1980s末迅速增加；CJ12-1269站位的生产力高于#34站位。两站位的浮游植物群落结构变化趋势相反。#34站位1960s以后D/B下降，反映出硅藻对总生产力的贡献增加；而CJ12-1269站位1950s以后D/B上升，反映出甲藻对总生产力的贡献增加。由于CJ12-1269站位离高营养盐以及Si/N下降的长江口较近，1950-1960s该站位生产力以及甲藻贡献的增加主要是由人类活动引起的；而#34站位硅藻贡献的增加很可能是由高营养盐以及高Si/N比的上升流引起的。 |
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