太湖常见沉水植物附着生物膜反硝化速率及影响因素  

Denitrification rate of epiphytic biofilms on submersed macrophytes and its influencing factors in Taihu Lake

作　　者：郭婧 宋玉芝 任天一[1,2] GUO Jing;SONG Yuzhi;REN Tianyi(Key Laboratory of Ecosystem Carbon Source and Sink,China Meteorological Administration(ECSS-CMA),210044,Nanjing;School of Applied Meteorology,Nanjing University of Information Science&Technology,210044,Nanjing;Research Center for Global Changes and Ecosystem Carbon Sequestration&Mitigation,Nanjing University of Information Scien ce&Technology,210044,Nanjing)

机构地区：[1]中国气象局生态系统碳源汇开放重点实验室,江苏南京210044 [2]南京信息工程大学应用气象学院,江苏南京210044 [3]南京信息工程大学固碳减排与全球变化研究中心,江苏南京210044

出　　处：《水生态学杂志》2025年第2期184-193,共10页Journal of Hydroecology

基　　金：国家自然科学基金项目(42077303);江苏省科技计划项目(BK20220021)。

摘　　要：研究太湖不同湖区沉水植物附着生物膜反硝化速率时空分布规律及其与环境因子的关系,为太湖湖泊管理和生态修复提供基础数据。2022年7月及10月采集太湖常见沉水植物金鱼藻(Ceratophyllum demersum)、苦草(Vallisneria natans)、马来眼子菜(Potamogeton malaianus)、狐尾藻(Myriophyllum Spicatum),利用乙炔抑制法测定沉水植物附着生物膜反硝化速率,并分析其与环境因子之间的关系。结果表明,太湖常见沉水植物附着生物膜反硝化速率具有一定时空差异,空间变化表现为夏季的苦草和秋季的苦草、马来眼子菜、狐尾藻附着生物膜反硝化速率贡湖湾显著高于胥口湾;时间变化表现为秋季>夏季。同一湖区不同种类沉水植物附着生物膜反硝化速率存在差异:在夏季胥口湾的沉水植物附着生物膜反硝化速率表现为苦草>马来眼子菜;秋季两湖区各沉水植物附着生物膜反硝化速率均表现为金鱼藻最大,其次是苦草,马来眼子菜和狐尾藻较低。太湖沉水植物附着生物膜反硝化速率与水体温度、pH、透明度、各形态的氮、磷酸根(PO^(4)^(3-))、总悬浮颗粒物(SS)、无灰干重(AFDW)、总有机碳(TOC)、化学需氧量(COD)呈显著相关(P<0.05),也与附着生物膜中的可溶性总氮(TDN)、铵态氮(NH_(4)^(+))、硝态氮(NO_(3)^(-))、PO^(4)^(3-)、SS、AFDW、TOC呈显著正相关(P<0.05)。Denitrification of epiphytic biofilms on submersed macrophytes plays an important role in nitrogen removal in shallow lake ecosystem.In order to explore the denitrification rate of epiphytic biofilms on submersed macrophytes and its relationship with environmental factors in Taihu Lake,the submersed macrophytes Ceratophyllum demersum,Vallisneria natans,Potamogeton malaianus,Myriophyllum Spicatum were collected from Taihu Lake in July and October 2022,the denitrification rates of epiphytic biofilms were measured by the acetylene inhibition method,and the relationship between the denitrification rates and environmental factors was analyzed.The results showed that the denitrification rates of epiphytic biofilms on submersed macrophytes in Taihu Lake were different in space and time.The time variation showed that the denitrification rates of epiphytic biofilms of Vallisneria natans in summer and Vallisneria natans,Ceratophyllum demersum,Myriophyllum Spicatum in autumn were significantly higher in Gonghu Bay than in Xukou Bay.The seasons variation of epiphytic biofilms was Autumn>Summer.There were differences in denitrification rates in epiphytic biofilms among different submerged macrophytes in the same lake area.In summer,the denitrification rates of the epip hytic biofilms on submersed macrophytes in the Xukou Bay of Taihu Lake were Vallisneria natans>Potamogeton malaianus.In autumn,the denitrification rates of epiphytic biofilms of submerged macrophytes in Taihu Lake was the highest for Ceratophyllum demersum,followed by Vallisneria natans,Potamogeton malaianus and Myriophyllum Spicatum.The denitrification rates of epiphytic biofilms of different submerged macrophytes in Taihu Lake were significantly correlated with the levels of water temperature,pH,transparency,various forms of nitrogen,phosphate radical(PO^(4)^(3-)),total suspended substance(SS),ash-free dry weight(AFDW),total organic carbon(TOC)and chemical oxygen demand(COD)(P<0.05),and also significantly and positively correlated with the total dissolved nit

关 键 词：沉水植物 附着生物膜 反硝化 时空异质性 太湖 

分 类 号：X52[环境科学与工程—环境工程]