Abstract
From 2015 to 2019, samples of surface mud from the bottom of the artificial lake in Tianjin Normal University were collected for diatom analysis and identification in May and June. 1296 diatoms were identified and divided into 25 species. DAIpo (Diatom Assemblage Index to organic water pollution) was calculated: 56 in 2015, 76 in 2017, 58 in 2018 and 63 in 2019. In 2017, it was β-oligosaprobic, and in 2015, 2018 and 2019, it belonged to α-oligosaprobic. The Jinyaoshi Lake is an artificial lake where groundwater is exposed by artificial excavation, and its water source mainly comes from groundwater, then by precipitation. It shows that the pollution degree of the Jinyaoshi Lake was not serious since 2015, and its pollution level was α or β-oligosaprobic.
Highlights
Diatoms are abundant in water and are easy to sample
From 2015 to 2019, samples of surface mud from the bottom of the artificial lake in Tianjin Normal University were collected for diatom analysis and identification in May and June. 1296 diatoms were identified and divided into 25 species
Diatoms were divided into three groups: saprophilous taxa, eurysaprobic taxa, and saproxenous taxa
Summary
Diatoms are abundant in water (including lakes, rivers, oceans, etc.) and are easy to sample. Diatoms are of great significance to the environment. It is a great indicator of environmental assessment. Watanabe, T. et al (1986) published DAIpo, a comprehensive evaluation value of organic pollution based on attached diatoms. Diatoms were divided into three groups: saprophilous taxa, eurysaprobic taxa, and saproxenous taxa. The relative percentages of the three species are calculated to obtain the water pollution degree, DAIpo. By calculating the DAIpo, the organic pollution degree of water can be numerically calculated, and the pollution status of different water or different periods of the same water can be compared (Watanabe,et al 1986a,b,1988; Asai and Watanabe,1995). Watanabe and other methods were used to evaluate the pollution degree of artificial lake in Tianjin Normal University in the southwest of Tianjin in different years
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