Influence of Attached Bacteria of Myriophyllum spicatum and Its Water Quality on the Algal Inhibition Effect

YANG Shuo; ZUO Shengpeng; WANG Huimei; LI Yi

doi:10.19672/j.cnki.1003-6504.0955.24.338

Abstract：The use of submerged plants to release chemosensitive substances to inhibit the growth of cyanobacteria in water bodies is currently a highly ecologically safe means of algae suppression.However,most studies on submerged plants have fo-cused on the plants themselves,and less attention has been paid to epiphytes and their symbiotic systems.Therefore,from the perspective that external biological effects may have an impact on the algae inhibition of submerged plants,three typical growth sites of Myriophyllum spicatum in the Chaohu Lake Basin were selected for the study.The attached bacteria and water quality related indexes as well as algal inhibition effect of Myriophyllum spicatum were determined,and the results showed that the first three dominant bacteria attached to Myriophyllum spicatum were Acidobacteria(4.54％),Dechloromonas(2.69％),and Verruco-microbiuin(2.13％);the DO content of the growth water quality was 11.48～12.84 mg/L,the KPM index was 3.77～6.91 mg/L,the total nitrogen and total phosphorus content was 1.22～2.85 mg/L and 0.057～0.076 mg/L,respectively;the inhibition rate of cyanobacteria ranged from 30％to 80％.The correlation analysis showed that the Shannon diversity index of the attached bac-teria of Myriophyllum spicatum showed a significant positive correlation with the algal inhibition rate of Myriophyllum spica-tum(p＜0.05),a significant negative correlation with the total phosphorus content of the water body(p＜0.05),and no signifi-cant correlation with the total nitrogen and ammonia content of the water body.Therefore,the differences in the attached bacteria and the quality of the growing water of Myriophyllum spicatum in different habitats significantly affected its algal inhibition effect.