Effects of cyanobacterial accumulation and decomposition on the microenvironment in water and sediment

Zhang, Weizhen; Gu, Ping; Zhu, Wenjie; Jing, Chaosen; He, Jianguo; Yang, Xiaoying; Liang, Zhiyong; Zhang, Zheng

doi:10.1007/s11368-019-02539-5

Cited by 19 publications

(1 citation statement)

References 78 publications

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“…In large lakes, algae may migrate from other zones by winds and settle in the application field of P inactivation agents. , In Taihu Lake, a Chinese eutrophic lake, dense algal mats are often observed in the downwind northwestern bays following prevailing southeast winds, where many lake geo-engineering measures were conducted to combat algal blooms. , The decomposition of the settled algal biomass can alter lake microenvironments (pH, ORP, DO, etc.) and consequently change the behavior of P in surface sediments. , The decomposition of algal biomass has been proven to be capable of transforming sediment organic P (OP) to inorganic P (IP), altering internal P release. , Moreover, it has also been proven that the decomposition of algal biomass can increase the abundance of P-solubilizing bacteria, such as genus Pseudomonas , enhancing P release through dissolution . Hence, we hypothesize that, after the application of P inactivation agents, the decomposition and settling of algal biomass from the overlying water may negatively impact the performance of P inactivation agents, decreasing its ability to control sediment P release.…”

Section: Introductionmentioning

confidence: 99%

Algal Settlement Inactivates Lanthanum/Aluminum Comodified Attapulgite: Implications for Phosphorus Control in Shallow Lakes

et al. 2022

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Phosphorus (P) inactivation agents have been widely used to control sediment P release for combating lake eutrophication. The settlement and decomposition of algal biomass from the overlying water can alter the microenvironment of the capping layer and potentially affect the performance of P inactivation agents. In this study, we explored the impacts of algal decomposition on the performance of lanthanum/aluminum comodified attapulgite (LAA), a commonly used P inactivation agent, and the underlying mechanisms through incubation experiments. The results showed that algal settlement and decomposition could inactivate LAA. After algal settlement, the amount of P locked in the LAA decreased by 11.8% relative to the control. Algal decomposition induced anoxia in the capping layer of LAA, which favored the growth of phosphate-solubilizing bacteria, thereby enhancing P release; meanwhile, driven by algal decomposition, more organic matter penetrated the capping layer and competed with P adsorption sites. The increased desorption ability and decreased adsorption ability inhibited the performance of LAA, increasing the P permeability of the capping layer. This study provides beneficial information for future field applications of P inactivation agents for lake restoration.

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