Carbon isotopes and lignin phenols for tracing the floods during the past 70 years in the middle reach of the Changjiang River

作     者：Zhongqiao Li Ying Wu Liyang Yang Jinzhou Du Bing Deng Jing Zhang Zhongqiao Li;Ying Wu;Liyang Yang;Jinzhou Du;Bing Deng;Jing Zhang

作者机构：State Key Laboratory of Estuarine and Coastal ResearchEast China Normal UniversityShanghai 210012China Key Laboratory of Marine Ecosystem DynamicsSecond Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China College of Environment and ResourcesFuzhou UniversityFuzhou 350108China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2020年第39卷第4期

页      面：33-41页

核心收录：

学科分类：08[工学] 081501[工学-水文学及水资源] 0815[工学-水利工程] 

基　　金：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 

主　　题：flood record carbon isotopes lignin phenols Changjiang River Lake Tian E Zhou 

摘      要：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 ***,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 *** 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 *** 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(p0.05).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.