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Preferential regeneration of P relative to C in a freshwater lake
Jingan Chen;  Yan Zeng;  Jia Yu;  Jingfu Wang;  Haiquan Yang;  Yaoting Lu
2019
Source PublicationChemosphere
Volume222Pages:15-21
Abstract

Particulate organic matter (POM) is the main carrier of carbon (C), nitrogen (N), and phosphorus (P) in the biogeochemical cycle. Previous investigations have found that the regeneration of C, N, and P is obviously different during the degradation of POM in marine environments. However, little attention has been paid to lake system thus far. In an initial attempt to characterize the regeneration behaviors of C and P in lake system, contents of C, N, and P in suspended particulate matter (SPM) and surface sediments of Hongfeng Lake were systematically investigated in this study. The results showed that the total organic carbon (TOC) to total phosphorus (TP) ratios (TOC/P) were obviously lower in SPM than in surface sediments, which demonstrated the preferential regeneration of P relative to C in lake system for the first time. Possible mechanisms for such include reductive dissolution of Fe oxyhydroxide and poly-P remineralization under hypoxic/anoxic conditions.

Based on the difference in the TOC/P ratios between SPM and surface sediments, about 25.1 t P was estimated to be released annually from settling seston and sediments in Hongfeng Lake, which is much higher than the previous results on the P release flux from sediment. This indicates that a significant percentage of P may be regenerated during particulate matter transport in the water column, providing new insight into the P regeneration in lake system. The preferential regeneration of P may result in a positive feedback loop among bottom water anoxia, enhanced P regeneration, and algal bloom in sub-deep lakes.

KeywordPregeneration Toc/p Ratio Suspended Particulate Matter Sediment Hongfeng Lake
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10225
Collection环境地球化学国家重点实验室
Affiliation1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, PR China
2.University of Chinese Academy of Sciences, Beijing, 100049, PR China
Recommended Citation
GB/T 7714
Jingan Chen;Yan Zeng;Jia Yu;Jingfu Wang;Haiquan Yang;Yaoting Lu. Preferential regeneration of P relative to C in a freshwater lake[J]. Chemosphere,2019,222:15-21.
APA Jingan Chen;Yan Zeng;Jia Yu;Jingfu Wang;Haiquan Yang;Yaoting Lu.(2019).Preferential regeneration of P relative to C in a freshwater lake.Chemosphere,222,15-21.
MLA Jingan Chen;Yan Zeng;Jia Yu;Jingfu Wang;Haiquan Yang;Yaoting Lu."Preferential regeneration of P relative to C in a freshwater lake".Chemosphere 222(2019):15-21.
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