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The oxygen isotopic composition of phosphate as an effective tracer for phosphate sources in Hongfeng Lake
Yongxue Ji;  Jingan Chen;  Runyu Zhang;  Yong Liu;  Jingfu Wang
2017
Source PublicationActa Geochimica
Volume36Issue:4Pages:619-625
Abstract

In order to characterize the oxygen isotopic composition of internal phosphate and explore the possibility of using these data to identify phosphate sources, we measured oxygen isotopic compositions of phosphate (delta~(18)O_p) in sediment pore water in Hongfeng Lake,a typical deep-water lake in a mountainous area. These data, in combination with delta~(18)O_p in surface water samples and water column samples,were successfully used to identify phosphate sources. The delta~(18)O_p value of sediment pore water ranged from 15.2 to 15.8, with an average value of 15.5-the delta~(18)O_p value of internal phosphate. The delta~(18)O_p values decreased gradually through the water column from 19.4%o in surface water to 16.4 in deeper water,implying that internal phosphate had more negative delta~(18)O_p values than external phosphate. This finding was substantiated by horizontal variations in delta~(18)O_P values, which decreased with increasing distance from inflowing rivers. All collected evidence suggests that external and internal phosphate have distinctly different isotopic signatures and that these signatures have not been considerably altered by biological mediation in Hongfeng Lake. Therefore, delta~(18)O_P can be used to distinguish phosphate sources. A two-endmember mixing model showed that internal phosphate had an average contribution of 40%,highlighting the influence of internal phosphorus loading on aqueous phosphate and eutrophication. This study illustrates the need to reduce the internal phosphorus load from sediment and provides guidance for nutrient management and in-lake restoration treatment in Hongfeng Lake. The data presented here are limited, but serve to highlight the great potential of delta~(18)O_p as an effective tracer for identifying phosphate sources. Systematic investigations of the oxygen isotopic compositions of external phosphate,internal phosphate,and phosphate through the water column,in combination with in-lake P biogeochemical cycle study,would be desirable in further research.

KeywordPhosphate Source Delta~(18)O_p Eutrophication Hongfeng Lake
Indexed ByEI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/7710
Collection环境地球化学国家重点实验室
Affiliation1.Institute of Geochemistry, Chinese Academy of Sciences, State Key Laboratory of Environmental Geochemistry, Guiyang, Guizhou 550081, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
First Author Affilication中国科学院地球化学研究所
Corresponding Author Affilication中国科学院地球化学研究所
Recommended Citation
GB/T 7714
Yongxue Ji;Jingan Chen;Runyu Zhang;Yong Liu;Jingfu Wang. The oxygen isotopic composition of phosphate as an effective tracer for phosphate sources in Hongfeng Lake[J]. Acta Geochimica,2017,36(4):619-625.
APA Yongxue Ji;Jingan Chen;Runyu Zhang;Yong Liu;Jingfu Wang.(2017).The oxygen isotopic composition of phosphate as an effective tracer for phosphate sources in Hongfeng Lake.Acta Geochimica,36(4),619-625.
MLA Yongxue Ji;Jingan Chen;Runyu Zhang;Yong Liu;Jingfu Wang."The oxygen isotopic composition of phosphate as an effective tracer for phosphate sources in Hongfeng Lake".Acta Geochimica 36.4(2017):619-625.
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