Journal
WETLANDS
Volume 39, Issue -, Pages S25-S33Publisher
SPRINGER
DOI: 10.1007/s13157-017-0988-z
Keywords
Sedimented organic matter; Organic carbon isotope; Organic nitrogen isotope; Organic matter sources; Shallow lake
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Funding
- National Natural Science Foundation of China [41263002]
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Water exchange in shallow lakes alongside Poyang Lake is weak because of sluggish water flow, and thus these lakes are susceptible to the effects of human activities and nutrient oversupply. Therefore, it is meaningful to study the sources of organic matter in these lakes, which is supposed to provide theoretical basis for the control of eutrophication of the lakes. The sources of organic matter in surface sediment in shallow lakes (Bang, Sha, Dahuchi, and Zhu lakes) alongside Poyang Lake and urban lakes (Qingshan and Xiang lakes) in Nanchang City were investigated by measuring the delta N-15 and delta C-13 values, total organic carbon and total organic nitrogen contents, and C/N ratios of sedimented organic matter (SOM). The delta N-15, delta C-13, and C/N ratios indicated that SOM in Sha and Dahuchi lakes mostly originated in phytoplankton, SOM in Bang and Zhu lakes was supplied by phytoplankton and soil organic matter, SOM in Qingshan Lake was strongly affected by sewage organic matter, and SOM in Xiang Lake mainly came from aquatic macrophytes. The results demonstrate that stable isotopes in SOM in lakes can be used to discriminate between different sources of organic material.
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