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Biogeochemistry of organic matter and associated elements along the river-estuary-ocean continuum
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The distribution of labile organic matter in Pearl River estuary as indicated by amino acid carbon isotopes
P-C1-02-S
Peihong kang* , State Key Laboratory of Marine Environmental Science (Xiamen University), Xiamen, Fujian, 361102, China School of Ocean and Earth Sciences, Xiamen University, Xiamen, Fujian, 361102, China
Han Zhang, Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;
Yifan Zhu, State Key Laboratory of Marine Environmental Science (Xiamen University), Xiamen, Fujian, 361102, China School of Ocean and Earth Sciences, Xiamen University, Xiamen, Fujian, 361102, China
Jie Liu, State Key Laboratory of Marine Environmental Science (Xiamen University), Xiamen, Fujian, 361102, China School of Ocean and Earth Sciences, Xiamen University, Xiamen, Fujian, 361102, China
Biyan He, School of Bioengineering, Jimei University, Xiamen 361021, China;
Qing Li, State Key Laboratory of Marine Environmental Science (Xiamen University), Xiamen, Fujian, 361102, China School of Ocean and Earth Sciences, Xiamen University, Xiamen, Fujian, 361102, China
Tiantian Tang*, State Key Laboratory of Marine Environmental Science (Xiamen University), Xiamen, Fujian, 361102, China School of Ocean and Earth Sciences, Xiamen University, Xiamen, Fujian, 361102, China
Presenter Email: kangpeihong@stu.xmu.edu.cn |
| The production, transportation and decomposition of particulate organic matter (POM) has a profound influence on estuarine carbon cycling. To better understand the behavior of estuarine labile organic matter, stable carbon isotope patterns of amino acids(δ13CAA) were investigated in particles from surface water collected along a salinity transect in the Pearl River Estuary in the winter of 2016. A varied isotopic difference between amino acids and bulk organic carbon is speculated to result from the changing relative contributions of refractory terrestrial input and algal derived organic matter. During a degradation incubation of Cyanobacterium Synechococcus sp. CCMP1334, individual amino acids altered their isotopic signatures in the 30-day decomposition, while the bulk remains little change. This indicates that degradation may be a major cause of the change in δ13CAA of algal derived amino acid , which may partially explain the observed δ13CAA pattern in the estuary. |
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