Characteristic analysis of phospholipid fatty acids (PLFAs) in typical nutrient polluted lake sediment in Wuhan  

作　　者：Xia Zhang Qianru Chen Chuan Wang Hongpei Zhang Yuqing Zhao Liping Zhang Biyun Liu Zhenbin Wu Qiaohong Zhou 

机构地区：[1]College of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China [2]State Key Laboratory of Freshwater Ecology and Biotechnology,Institute of Hydrobiology,Chinese Academy of Sciences,Wuhan 430072,China

出　　处：《International Journal of Sediment Research》2021年第2期221-228,共8页国际泥沙研究（英文版）

基　　金：This work was supported by the Strategic Priority Research Programof the Chinese Academy of Sciences(Grant No.XDA23040401);the State Key Laboratory of Freshwater Ecology and Biotechnology(Grant No.2019FBZ03).

摘　　要：The process of urbanization aggravates the endogenous pollution of urban lake sediment,and polluted sediment may seriously affect the quality of the water in lakes.At present,it is difficult to distinguish the difference between sediment that is heavily polluted by nitrogen(N)and phosphorus(P)when using an analysis based on a physicochemical index classification.The current study applied phospholipid fatty acid(PLFA)technology to further analyze the sediment characteristics from the perspective of microbiology.Surface sediment from five urban lakes that are heavily polluted with N and P in Wuhan were sampled.Statistical approaches were used to analyze the microbial community structure in the sampled sediment,and to determine the correlations between the microorganisms and physicochemical indices.The most severely polluted lake sediment had similar PLFA structures,the highest saturated fatty-acid content,and bacteria as the dominant microorganism.However,there were differences between the microbial biomass of the various sediment samples,which may have been related to the degree of N and P pollution.Analysis of the microbial diversity in the sediment samples indicated that the bacteria were experiencing starvation and nutrient pressure,which may have been due to the dissolved oxygen concentration of the heavily polluted lake sediment.A correlation analysis showed that the endogenous N and P had different effects on the microbes of the polluted sediment.A redundancy analysis(RDA)demonstrated that the N/P ratio had the greatest influence on the PLFA species,accounting for 83%of the cumulative interpretation.To effectively promote the role of sediment microorganisms on circulating elements,it is necessary to regulate the N/P ratio of the sediment to some extent.When the N/P ratio in sediment exceeds 6,N pollution should be prioritized.

关 键 词：Lake sediment Endogenous pollution Phospholipid fatty acid(PLFA)analysis Microbial population N/P ratio 

分 类 号：X524[环境科学与工程—环境工程]