Sources and Cycling of Phosphorus in the Sediment of Rivers along a Eutrophic Lake in China Indicated by Phosphate Oxygen Isotopes,ACS Earth and Space Chemistry

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Sources and Cycling of Phosphorus in the Sediment of Rivers along a Eutrophic Lake in China Indicated by Phosphate Oxygen Isotopes
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2021-01-12 , DOI: 10.1021/acsearthspacechem.0c00298
Ju Wang ₁ , Tao Huang _{1,

2} , Qianqian Wu ₁ , Chengcheng Bu ₁ , Xijie Yin ₃

Affiliation

Sources and cycling of phosphorus in the sediment of inflow rivers (FL, TY and QY) along the eutrophic Chaohu lake, China were discussed by using the oxygen isotope compositions of phosphorus fractions of Fe/Al–P_i and Ca–P_i (SMT) and Fe–P_i, Auth-P_i, and Detr-P_i (SEDEX). The δ¹⁸O_Fe/Al-Pi (11.9‰–19.6‰) and δ¹⁸O_Ca-Pi (9.6‰–18.2‰) in FL, TY, and QY river sediments deviated far from the isotopic equilibrium (δ¹⁸O_p-equ, 19.4‰–21.5‰) in the Chaohu watershed. Depletion of δ¹⁸O_Fe/Al-Pi in river sediments indicated a likely source of ¹⁸O-depleted phosphates from the hydrolysis of organic phosphorus. The δ¹⁸O_Ca-Pi values in FL sediments ranged from 9.6‰ to 13.7‰, indicating phosphate source from weathered soils; while those in TY and QY ranged between 11.5‰ and 18.2‰, indicating the Ca–P_i was partly inherited from agricultural fertilizers and partly taken from domestic sewage. Significant correlations (r = 0.85, P < 0.01) between δ¹⁸O_Fe/Al-Pi and δ¹⁸O_Ca-Pi of FL, TY, and QY river sediments indicated common phosphate sources for Fe/Al–P_i and Ca–P_i, and thus suggested the new formation of secondary Ca-bound phosphates. These recycling of phosphorus in FL, TY, and QY indicated by δ¹⁸O_Fe/Al-Pi and δ¹⁸O_Ca-Pi were supported further by the δ¹⁸O_Fe-Pi, δ¹⁸O_Auth-Pi and δ¹⁸O_Detr-Pi in new TY sediments collected independently. This study provides a new perspective on understanding the sources and cycling of phosphorus in aquatic environments.

更新日期：2021-01-21

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