Spatial and temporal distribution of microcystin in Taihu Lake

被引：0
作者：
Wang, Jing-Guo [1 ]
Zou, Hua [1 ]
Zhang, Qiang [1 ]
Chen, Lin-Li [1 ]
Wang, Zhen [1 ]
机构：
[1] School of Environment and Civil Engineering, Jiangnan University
来源：
Research of Environmental Sciences | 2014年 / 27卷 / 07期
关键词：
Chla; Correlation; Microcystin; Total nitrogen; Total phosphorus;
D O I：
10.13198/j.issn.1001-6929.2014.07.03
中图分类号：
学科分类号：
摘要：
In order to explore the variation of microcystin and its main environmental factors, the spatial-temporal variations of a series of biological, chemical and environmental parameters including total microcystin (TMC), extracellular microcystin (EMC), intracellular microcystin (IMC), ρ(Chla), cyanobacterial biomass, ρ(TN), ρ(TP), N/P[ρ(TN)/ρ(TP)], pH, temperature, transparency, conductivity and ρ(dissolved oxygen) were characterized based on continuous and synchronous monitoring of water quality from 34 locations in Taihu Lake from November 2011 to October 2012. The relationship between water quality and MCs was also investigated. Taihu Lake was divided into six regions -with a total of 34 sampling points -based on its terrain and water quality. The concentrations of microcystin were measured by Enzyme-Linked Immunosorbent Assay (ELISA), using standard recovery experiments to evaluate the method's accuracy. All statistical analyses were conducted with SPSS software. The concentrations of ρ(MCs) in Taihu Lake showed a temporal pattern. ρ(MCs) were at a low level from March to June, then gradually increased during the outbreak of cyanobacterial blooms from July to August, but were still below the level of 0.10 μg/L. In September, ρ(IMC) and ρ(EMC) spiked to 0.18 and 0.10 μg/L, respectively. Although the temporal pattern of microcystin concentrations was similar among plots, the unbalanced development of regions and different hydrological conditions around Taihu Lake affected the spatial variation. Toxin levels were slightly higher in the northwest than in other regions, with the maximum value of 0.30 μg/L appearing in the northwest area. Strong correlations were found between ρ(MCs) and ρ(Chla), ρ(TN), ρ(TP) and N/P. The biomass of cyanobacteria was positively correlated to ρ(TMC) and ρ(IMC) (P<0.05), but not ρ(EMC). ρ(TN) was negatively correlated to ρ(IMC) (P<0.01), ρ(TMC) (P<0.01) and ρ(EMC) (P<0.05). ρ(MCs) was positively correlated to ρ(TP) (P<0.05), while negatively correlated to N/P (P<0.05).
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页码：696 / 703
页数：7
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