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Records of bulk organic matter and plant pigments in sediment of the ＂red-tide zone＂ adjacent to the Changjiang River estuary

ISSN号：0254-4059
期刊名称：《中国海洋湖沼学报：英文版》
时间：0
分类：P[天文地球]
作者机构：[1]Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China, [2]University of Chinese Academy of Sciences, Beijing 100049, China, [3]Qinzhou University, Qinzhou 535099, China, [4]Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
相关基金：Supported by the National Basic Research Program of China （973 Program）（No. 2010CB428705）, the Strategic Priority Research Program of the Chinese Academy of Sciences （No. XDA11020304）, the National Natural Science Foundation of China （Nos. 41206098, U1406403, 41121064）, and the Open Cruise 2009 for Chinese Offshore Oceanography Research by IOCAS, ACKNOWLEDGEMENT We thank Professor WANG Y. P. from Nanjing University, Professor DIAO S. B. from Qingdao Institute of Marine Geology, and Dr. NAN Q. Y. from IOCAS for their assistance in the analyses of the ^210Pb, ^137Cs, and stable C and N isotopes.

作者：亢振军[1,2,3], 于仁成[1,4], 孔凡洲[1,4], 王云峰[1,4], 高岩[1,2], 陈建华[1,2], 郭伟[1,2,3], 周名江[1]

关键词： EUTROPHICATION, harmful, algal, bloom, HYPOXIA, PIGMENT, sediment, core, Changjiang, River, estuary, eutrophication, harmful algal bloom, hypoxia, pigment, sediment core, Changjiang River estuary

中文摘要：

Cultural eutrophication caused by nutrient over-enrichment in coastal waters will lead to a cascading set of ecosystem changes and deleterious ecological consequences,such as harmful algal blooms（HABs） and hypoxia.During the past two decades since the late 1990s,recurrent large-scale HABs（red tides）and an extensive hypoxic zone have been reported in the coastal waters adjacent to the Changjiang River estuary.To retrieve the history of eutrophication and its associated ecosystem changes,a sediment core was collected from the 'red-tide zone' adjacent to the Changjiang River estuary.The core was dated using the210Pb radioisotope and examined for multiple proxies,including organic carbon（OC）,total nitrogen（TN）,stable isotopes of C and N,and plant pigments.An apparent up-core increase of OC content was observed after the 1970s,accompanied by a rapid increase of TN.The concurrent enrichment of δ13C and increase of the C/N ratio suggested the accumulation of organic matter derived from marine primary production during this stage.The accumulation of OC after the 1970 s well reflected the significant increase of primary production in the red-tide zone and probably the intensification of hypoxia as well.Plant pigments,including chlorophyll a,p-carotene,and diatoxanthin,showed similar patterns of variation to OC throughout the core,which further confirmed the important contribution of microalgae,particularly diatoms,to the deposited organic matter.Based on the variant profiles of the pigments representative of different microalgal groups,the potential changes of the phytoplankton community since the 1970s were discussed.

英文摘要：

Cultural eutrophication caused by nutrient over-enrichment in coastal waters will lead to a cascading set of ecosystem changes and deleterious ecological consequences, such as harmful algal blooms （HABs） and hypoxia. During the past two decades since the late 1990s, recurrent large-scale HABs （red tides） and an extensive hypoxic zone have been reported in the coastal waters adjacent to the Changjiang River estuary. To retrieve the history of eutrophication and its associated ecosystem changes, a sediment core was collected from the ＂red-tide zone＂ adjacent to the Changjiang River estuary. The core was dated using the ^210pb radioisotope and examined for multiple proxies, including organic carbon （OC）, total nitrogen （TN）, stable isotopes of C and N, and plant pigments. An apparent up-core increase of OC content was observed after the 1970s, accompanied by a rapid increase of TN. The concurrent enrichment of δ^13C and increase of the C/N ratio suggested the accumulation of organic matter derived from marine primary production during this stage. The accumulation of OC after the 1970s well reflected the significant increase of primary production in the red-tide zone and probably the intensification ofhypoxia as well. Plant pigments, including chlorophyll α, β-carotene, and diatoxanthin, showed similar patterns of variation to OC throughout the core, which further confirmed the important contribution of microalgae, particularly diatoms, to the deposited organic matter. Based on the variant profiles of the pigments representative of different microalgal groups, the potential changes of the phytoplankton community since the 1970s were discussed.

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