期刊
WATER RESEARCH
卷 225, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2022.119125
关键词
Algal and grass dominated zone; Sediment internal P loading; Sediment flux; Mobile P; P hotspot area in sediment
资金
- National Natural Science Foundation of China [41977363]
- Key Research Program of Frontier Sciences, CAS [ZDBS-LY-DQC018]
- CAS Interdisciplinary Innovation Team [JCTD-2018-16]
- Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory
This paper provides a detailed investigation of sediment internal P loading in Lake Taihu and its role in algal dominated zones (ADZs) and grass dominated zones (GDZs). The results show that ADZ sediments have higher levels of total P and mobile P fraction compared to GDZ sediments. The study also identifies ADZ as a hotspot for P, with high concentrations of DGT-measured P. Sediment microbial composition is found to be closely related to different P fractions in the sediment. The findings highlight the importance of considering the sediment composition and different management strategies for combating internal P loading in ADZ and GDZ.
Lake Taihu suffers from severe algal blooms every year, which is attributed primarily to the release of sediment phosphorus (P), namely the internal P loading. However, the overall internal P loading and the P hotspots in sediment have not been fully studied. This paper presents several methods, including sequential P extraction, the use of diffusive gradient in thin film (DGT), and intact core incubation to give a detailed investigation of sedi-ment internal P loading as well as its roles in algal dominated zones (ADZs) and grass dominated zones (GDZs) in Lake Taihu. Sediment microbial composition was also analyzed to investigate its relationship with P fractions. The results indicate that the total P and the mobile P fraction in the ADZ sediments are generally higher than those of the GDZ sediments. The percentage of sediment mobile P to TP is similar to the mobile P in their dis-tributions. In contrast, calcium bound P accounts for most of the TP in GDZ, while mobile P contributes the most to TP in ADZ. Overall, sediment can release 256 tons of TP and 217 tons of soluble reactive phosphorus (SRP) over a period of six months in the warmer seasons. Similarly, a high concentration of DGT-measured P was observed in ADZs that are recognized as P hotspots in Lake Taihu. Sediments in ADZ and GDZ was dominated by the bacteria Firmicutes and Proteobacteria, respectively and which were closely related with mobile P and calcium bound P in sediment, respectively. GZD seems to be able to retain more P in sediments, thereby reducing its contribution to of internal P loading. These results indicate that the difference in sediment composition between ADZ and GDZ affects their roles in sediment internal P loading, therefore, different management strategies should be used to combat sediment internal P loads in the two zones.
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