In situ and combined variations of phosphorus, iron and sulfur across the sediment-water interface of Lake Luoma
LIN Jian-yu1,2, SU Ya-ling1, HAN Chao1, TANG Hao3, WANG Zhao-de1, XU Di1, KE Fan1
1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. CCCC Shanghai Dredging Co. Ltd., Jiangsu Traffic Construction Engineering Branch, Nanjing 210000, China
Abstract：This study firstly obtained 8 typical profiles of labile phosphorus (P), iron (Fe), and sulfur (S) in the sediments of Lake Luoma using the in situ, diffusive gradients in thin films (DGT) technology, and then quantitatively calculated the combined fluxes of P, Fe and S across the sediment-water interfaces (SWI). Our results demonstrated that highly heterogeneous distributions of DGT-measured labile P, Fe and S in the sediment profiles, with the concentration ranges from 0 to 2.05mg/L, 0 to 11.10mg/L and 0.01 to 0.63mg/L, respectively. Generally, the concentrations of labile P and Fe in the northwest lake area were higher than those in the southeast lake area, while the variations of labile S showed no significant regularity. For all the profiles collected, the variations of labile P, Fe, and S exhibited a similar shape reflected by downward increases in concentration with sediment depth, and appear concentration peaks were observed within 60mm depth. Moreover, there was a significant positive correlation(r>0.65, P<0.01) between labile P and Fe, and the ratio of total iron to total phosphorus [w(∑Fe)/w(∑P)] was higher than 15, which disclosed that the geochemical cycle of Fe played an important role in controlling the release of endogenous phosphorus in Lake Luoma; The fluxes of labile P, Fe and S across the SWI were 0.066~0.698mg/(m2·d), 1.671~5.592mg/(m2·d) and 0.007~0.071mg/(m2·d), respectively, indicating that P, Fe and S of Lake Luoma were released from sediments to water. It may increase the risk of water pollution during the South-to-North Water Diversion and accordingly should be taken seriously. The above results supported the coupled release mechanism of P and Fe, and clarified the migration characteristics of active P, Fe and S in SWI of Lake Luoma, providing reference and theoretical basis for water quality control of Luoma Lake.
林建宇, 苏雅玲, 韩超, 唐皓, 王兆德, 许笛, 柯凡. 骆马湖泥-水界面磷铁硫原位同步变化特征[J]. 中国环境科学, 2021, 41(12): 5637-5645.
LIN Jian-yu, SU Ya-ling, HAN Chao, TANG Hao, WANG Zhao-de, XU Di, KE Fan. In situ and combined variations of phosphorus, iron and sulfur across the sediment-water interface of Lake Luoma. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(12): 5637-5645.
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