摘要
沉积物作为湖湾水体中磷的主要来源之一,其微生物群落在磷的吸附过程中扮演着重要角色。选取太湖梅梁湾和贡湖湾为研究区域,首先对研究区域水体和沉积物中氮、磷浓度进行空间分布特征研究,同时,进一步分析沉积物磷吸附特征和微生物群落差异性,阐明沉积物磷吸附特征与微生物群落的响应关系。结果表明,两个区域水体总磷(TP)质量浓度分别为0.136、0.220 mg/L,总氮(TN)质量浓度分别为1.279、2.004 mg/L,沉积物TP质量分数分别为440.29、586.37 mg/kg,TN质量分数分别为1161.21、1445.84 mg/kg。梅梁湾区域沉积物理论最大磷吸附量(Q_(max))较高,最高可达0.799 mg/g,且对磷的吸附速度快,吸附动力学常数达1.997 g/(mg·min),两个区域沉积物均存在扮演“源”的点位(M11和A10)。通过微生物群落结构演替规律分析,结果显示,贡湖湾藻型区域微生物多样性高于草型区域,变形菌门(Proteobacteria)是两个区域门分类级别上丰富度最高的门。M11和A10点位沉积物具有较大的磷吸附量,在微生物群落演替过程中,可能是解磷功能微生物解磷能量来源,从而加剧沉积物磷的释放,也进一步说明在微生物介导下,两个区域沉积物均有较强的磷释放风险。
Sediment is the main sources of phosphorus in lake bay,and its microbial community plays an important role in phosphorus adsorption.Based on the selection of Meiliang Bay and Gonghu Bay in Lake Taihu as the study area,the spatial distribution of nitrogen and phosphorus pollution in the overlying water and sediments were investigated,and phosphorus adsorption characteristics and microbial community variability were further analyzed to elucidate the response relationship between sediment phosphorus adsorption and microbial communities.The results showed that there were total phosphorus(TP)and total nitrogen(TN)concentrations in the overlying water from these two areas,with values reached 0.136,0.220 mg/L and 1.279,2.004 mg/L,respectively.The contents of TP and TN in sediments from these two areas were 440.29,586.37 mg/kg and 1161.21,1445.84 mg/kg,respectively.There were strong adsorption capacity and fast adsorption rate of phosphorus in Meiliang Bay,with maximum phosphorus adsorption capacity(Q_(max))and adsorption kinetic constant reached 0.799 mg/g and 1.997 g/(mg·min),respectively.The microbial community analysis indicated that the diversity of sediment bacterial communities was higher in the Gonghu Bay than in the Meiliang Bay,and Proteobacteria is the most abundant phylum.The sediments at sites M11 and A10 function as phosphorus sources and may be energy of phosphorus-solubilizing bacteria in the macrophyte-dominated and algae-dominated areas,so there is a risk of endogenous phosphorus release.The sediments from these two areas had phosphorus release risk,and highlighted the significant role of the microbial community for phosphorus adsorption.
作者
武涛
靳郑海
凃成琪
张继彪
黄威
WU Tao;JIN Zhenghai;TU Chengqi;ZHANG Jibiao;HUANG Wei(Jiangsu Aoyang Ecological Garden Co.,Ltd.,Suzhou 215600,China;College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China;Department of Environmental Science and Engineering,Fudan University,Shanghai 200433,China)
出处
《净水技术》
CAS
2022年第11期127-136,共10页
Water Purification Technology
基金
国家自然科学基金青年科学基金项目(52000024)
上海市青年科技英才杨帆计划(20YF1400300)
中央高校基本科研业务费专项资金。
关键词
沉积物
磷
微生物
吸附
群落
sediment
phosphorus
microbe
adsorption
community
