Tu Chengqi, Dong Xiaoshuang, Yang Haoran, Chang Yongsheng, Xu Zhongshuo, Che Feifei, Wang Shuhang, Huang Wei
State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, PR China.
National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Institute of Lake Environment and Ecology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China.
Chemosphere. 2024 Mar;352:141276. doi: 10.1016/j.chemosphere.2024.141276. Epub 2024 Jan 25.
Microbes may induce endogenous phosphorus (P) migration from lacustrine sediment. This study focused on the role of phosphate-solubilizing bacteria (PSB) disturbance in affecting the sediment P release and further contributing to cyanobacterial recruitment in Meiliang Bay, Lake Taihu. Gluconic acid was the main mechanism of phosphate solubilizing by PSB. The dominant PSB (Burkholderia) isolated from eutrophic lake sediments was used as a representative to investigate the effects of disturbance on endogenous P release using diffusive gradients in thin films (DGT) and high-resolution dialysis (HR-Peeper). The results show that soluble reactive phosphorus (SRP) and iron (Fe (II)) concentrations could reach 0.51 mg L and 33.56 mg L in pore water, respectively. And the sediment DGT-P and DGT-Fe were relatively reduced by PSB. Subsequent the chlorophyll a (Chl a) concentrations reached peaks of 344.8 μg L in overlying water. The abundance of the dominant PSB (Burkholderia-Caballeronia-Paraburkholderia) were significantly associated with Chl a (P < 0.05) and algal effective state phosphorus (AAP) (P < 0.05), respectively. PSB mainly regulates AAP leaching to pore water and then diffusing across the sediment-water interface to the overlying water, producing the effect of cyanobacteria recruitment. The results provide new insights into early management of cyanobacterial resuscitation in a large eutrophic lake.
微生物可能会诱导湖泊沉积物中内源磷的迁移。本研究聚焦于解磷细菌（PSB）扰动在影响沉积物磷释放以及进一步促使太湖梅梁湾蓝藻繁殖方面的作用。葡萄糖酸是PSB溶解磷的主要机制。从富营养化湖泊沉积物中分离出的优势PSB（伯克霍尔德氏菌）被用作代表，利用薄膜扩散梯度技术（DGT）和高分辨率透析技术（HR-Peeper）研究扰动对内源磷释放的影响。结果表明，孔隙水中的溶解性活性磷（SRP）和铁（Fe（II））浓度分别可达0.51 mg/L和33.56 mg/L。PSB使沉积物DGT-P和DGT-Fe相对降低。随后，上覆水中的叶绿素a（Chl a）浓度达到344.8 μg/L的峰值。优势PSB（伯克霍尔德氏菌-卡氏菌-副伯克霍尔德氏菌）的丰度分别与Chl a（P < 0.05）和藻类有效态磷（AAP）（P < 0.05）显著相关。PSB主要通过调节AAP向孔隙水的淋溶，然后扩散穿过沉积物-水界面进入上覆水，从而产生促进蓝藻繁殖的效果。该研究结果为大型富营养化湖泊蓝藻复苏的早期治理提供了新的见解。
