湖泊科学2024，Vol.36Issue(1)：77-87,11.DOI:10.18307/2024.0121
太湖常见3种沉水植物附着生物的生物量及潜在反硝化速率
Biomass and the potential denitrification rate of the epiphyton on three kinds of submerged plants in Lake Taihu
摘要
Abstract
Denitrification,as an important way to completely remove nitrogen from lakes,is important for reducing eutrophication in lakes.In order to explore the variation of biomass and potential denitrification rate of epiphyton in Lake Taihu,during the vigor-ous growing stage(July),three types of submerged macrophytes were sampled from the eastern lake bay of Lake Taihu for the dis-tributions of submerged plants,the biomass of epiphyton was analyzed and the potential denitrification rate of periphytic biofilm was determined by acetylene inhibition.The main influencing factors of the biomass and potential denitrification rate of epiphyton in Lake Taihu were also explored.The results showed that there were spatial differences in the biomass of epiphyton in Lake Taihu.The biomass per unit submerged plant body surface area of epiphyton in Lake Taihu ranged from 0.037 mg/m2 to 0.789 mg/m2 and the mean value was(0.389±0.261)mg/m2.The maximum biomass of epiphyton occurred at sampling site G1((0.794±0.007)mg/m2)in Gonghu Bay,and the minimum value occurred at samplling site X1((0.041±0.005)mg/m2)in Xukou Bay.The po-tential denitrification rate per unit submerged plant body surface area of epiphyton in Lake Taihu ranged from 3.09 μmol/(m2·h)to 58.80 μmol/(m2·h)and the mean value was(24.75±5.96)μmol/(m2·h).There were obvious spatial differences in the po-tential denitrification rates of epiphyton in Lake Taihu,the maximum value occured at sampling site G1((58.80±20.20)μmol/(m2·h))and the minimum value occurred at sampling site X1((3.09±1.79)μmol/(m2·h)).There were differences in the po-tential denitrification rates of epiphyton for the host plants,the potential denitrification rate of epiphyton on the Myriophyllum spica-tum was significantly higher than that on the Vallisneria natans.The results of the correlation analysis showed that there was a sig-nificant correlation between the biomass of epiphytons and the nitrogen of the water,and there was significant correlation between the potential denitrification rate of epiphyton and the biomass of epiphytic algae,DOC and pH of the water,which could explained 81.2％of the variation of the periphytic biofilm potential denitrification rate.The results of this study provide some theoretical basis for further research on the process of denitrification and eutrophication management in shallow lakes.关键词
附着生物/潜在反硝化速率/太湖/沉水植物Key words
Epiphyton/the potential denitrification rate/Lake Taihu/submerged plants引用本文复制引用
任天一,徐向华,宋玉芝,郭婧..太湖常见3种沉水植物附着生物的生物量及潜在反硝化速率[J].湖泊科学,2024,36(1):77-87,11.基金项目
国家自然科学基金项目(42077303)和江苏省科技计划项目(BK20220021)联合资助. （42077303）
