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Li Zhongqiao,Wu Ying,Yang Liyang,Du Jinzhou,Deng Bing,Zhang Jing. 2020. Carbon isotopes and lignin phenols for tracing the floods during the past 70 years in the middle reach of the Changjiang River. Acta Oceanologica Sinica, 39(4):33-41
Carbon isotopes and lignin phenols for tracing the floods during the past 70 years in the middle reach of the Changjiang River
应用碳同位素和木质素示踪长江中游过去70年以来的洪水事件
Received:February 23, 2019  
DOI:10.1007/s13131-020-1543-y
Key words:flood record  carbon isotopes  lignin phenols  Changjiang River  Lake Tian E Zhou
中文关键词:  洪水记录  碳同位素  木质素  长江  天鹅洲
基金项目:The National Natural Science Foundation of China under contract Nos 41021064, 41276081 and 41606211; the 111 Project under contract No. B08022; the Scientific Research Fund of Second Institute of Oceanography, MNR under contract No. JG1806.
Author NameAffiliationE-mail
Li Zhongqiao State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 210012, China
Key Laboratory of Marine Ecosystem Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China 
 
Wu Ying State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 210012, China wuying@sklec.ecnu.edu.cn 
Yang Liyang State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 210012, China
College of Environment and Resources, Fuzhou University, Fuzhou 350108, China 
 
Du Jinzhou State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 210012, China  
Deng Bing State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 210012, China  
Zhang Jing State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 210012, China  
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Abstract:
      The Lake Tian E Zhou (TEZ, an oxbow lake) was formed during the rerouting of the Changjiang River in 1972, with strong influences from the main river channel and flood events. Herein, a sediment core was collected from the Lake TEZ for the measurements of carbon isotopes and biomarkers, including stable carbon isotopes (δ13C), radiocarbon composition (?14C), and lignin phenols, as well as lead-210 to reconstruct recent heavy flood events over the past 70 years. At the 24–26 cm interval, the sediment contained the highest OC%, TN%, and lignin phenols content, as well as significantly depleted 13C but enriched 14C, corresponding to the extreme flood event in 1998. In addition, statistics from t-test showed that lignin phenols normalized to OC (Λ8), the concentration of 3, 5-dihydroxy benzoic acid (3, 5-BD), and the ratio of p-hydroxy benzophenone to total hydroxyl phenols (PHB/HP) were all significantly different between the layers containing flood deposits and the layers deposited under normal non-flood conditions (p<0.05). These results indicate that the later three parameters are highly related to flood events and can be used as compelling proxies, along with sediment chronology, for hydrological changes and storm/flood events in the river basin and coastal marine environments.
中文摘要:
      天鹅洲牛轭湖形成于长江改道的1972年,受到长江主河道和洪水事件的剧烈影响。在此,我们从天鹅洲采集一根柱状样,分析其有机碳的稳定同位素(δ13C)、放射性同位素(△14C)、木质素和210Pb等参数,用于重建过去70年以来长江中游发生的洪水事件。纵观整个剖面,24-26 cm层具有最高有机碳、总氮和木质素含量,最负的δ13C和最正的△14C,表明该层记录相对应的1998年特大洪水事件。此外,t检验结果表明,有机碳归一化后的木质素(Λ8),3,5-对羟基苯甲酸(3,5-Bd)和对羟基苯甲酮与对羟基酚的比值(PHB/HP)在洪水沉积物层与普通沉积层之间具有显著差异(p<0.05)。该统计结果表明Λ8、3,5-Bd和PHB/HP三个参数与洪水沉积高度相关,可以推广用来在河流或者海岸环境中示踪水动力改变和洪水事件的历史重建。
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