东钱湖水体异养细菌的时空分布及其与环境影响因素和有机质的关系  

The spatial and temporal distribution of heterotrophic bacteria in Dongqian Lake and it’s relationship with the environmental factors and the organic matter

作　　者：王海丽[1] 刁俊睿 钱文杰 邢雅丽 谢煜 金茅 沈钧亮 WANG Haili;DIAO Junrui;QIAN Wenjie;XING Yali;XIE Yu;JIN Mao;SHEN Junliang(Faculty of Biological and Environmental Science,Zhejiang Wanli University,Ningbo 315100,China)

机构地区：[1]浙江万里学院生物与环境学院

出　　处：《生态科学》2020年第1期85-92,共8页Ecological Science

基　　金：浙江省科技厅项目(2017C37056);浙江省“生物工程”一流学科开放基金项目(KF2015009)

摘　　要：为探究宁波东钱湖表层水体中异养细菌丰度的时空分布特征及其环境影响因素对可溶性有机质转化的影响,实验采用主成分分析及多元逐步回归分析方法研究了三者之间的关系,结果表明:调查期间东钱湖表层水体中异养细菌丰度的季节分布特征为夏季>春季>冬季,支流汇入口、码头或水上乐园区域水体中异养细菌丰度较高,近岸人类活动带来的陆源污染是造成此分布特征的主要原因;多元统计分析结果表明ST、DO、COD、Chla、DOM是制约宁波东钱湖表层水体中异养细菌分布的主要环境因素,且ST、Chla、COD、DOM中的类芳香族蛋白质Ⅰ及类溶解性微生物代谢产物IV与异养细菌丰度呈显著正相关(p<0.05),DO与异养细菌丰度呈极显著负相关(p<0.01);异养细菌等微生物的代谢转化活动和陆源输入共同决定DOM的来源和转化,但异养细菌对DOM具体的驱动转化机制有待于进一步的研究。To investigate the character of the spatiotemporal distribution of heterotrophic bacteria in the surface water in Dongqian Lake of Ningbo and its environmental parameters on the transformation of the dissolved organic matter(DOM),the principal component analysis and multivariate linear stepwise regression analysis were adopted to analyze the relationships among them.Significantly high values could be observed for heterotrophic bacteria abundance in summer compared to other sampling time with the lowest value in winter.In horizontal direction,there was higher bacteria abundance near the branch entrances,wharfs and water park areas.Such spatial distribution of heterotrophic bacteria demonstrated that anthropogenic riverbank land pollution played the key role in Dongqian Lake.The surface water temperature(ST),the dissolved oxygen(DO),Chla,the chemical oxygen demand(COD)and DOM were the main factors influencing the abundance heterotrophic bacteria in surface water.And ST,Chla,COD,the fluorescence of aromatic proteinⅠand the fluorescence of metabolites of soluble microorganisms IV of DOM showed significantly positive correlation with heterotrophic bacterial abundance(p<0.05),and DO had a significantly negative correlation with heterotrophic bacterial abundance(p<0.01).The metabolic transformation activities of heterotrophic bacteria and other microorganisms and land-based input together determined the origin and transformation of DOM,but the specific driving mechanism needs further study.

关 键 词：东钱湖 异养细菌 环境因素 可溶性有机质 

分 类 号：X17[环境科学与工程—环境科学]