TEMPORAL-SPATIAL DISTRIBUTION OF EPIPELIC ALGAE AND ITS RELATIONSHIP WITH ENVIRONMENTAL FACTORS IN THE TAIHU LAKE

SONG Yuzhi; WU Yufei; LI Haoran

doi:10.13205/j.hjgc.202301003

Volume 41 Issue 1

Jan. 2023

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SONG Yuzhi, WU Yufei, LI Haoran. TEMPORAL-SPATIAL DISTRIBUTION OF EPIPELIC ALGAE AND ITS RELATIONSHIP WITH ENVIRONMENTAL FACTORS IN THE TAIHU LAKE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(1): 18-25. doi: 10.13205/j.hjgc.202301003

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SONG Yuzhi, WU Yufei, LI Haoran. TEMPORAL-SPATIAL DISTRIBUTION OF EPIPELIC ALGAE AND ITS RELATIONSHIP WITH ENVIRONMENTAL FACTORS IN THE TAIHU LAKE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(1): 18-25. doi: 10.13205/j.hjgc.202301003

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TEMPORAL-SPATIAL DISTRIBUTION OF EPIPELIC ALGAE AND ITS RELATIONSHIP WITH ENVIRONMENTAL FACTORS IN THE TAIHU LAKE

doi: 10.13205/j.hjgc.202301003

Research Centre for Global Changes and Ecosystem Carbon Sequestration & Mitigation, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China

Received Date: 2022-05-26
Available Online: 2023-03-23

Abstract

Abstract

To understand the environmental variables responsible for regulating epipelic algal community composition and biomass in the surface sediment, habitat-linked heterogeneity in algal taxon-specific pigments[chlorophyll a(Chl.a), chlorophyll b(Chl.b), fucoxanthin(Fuco), zeaxanthin(Zea)] in surface sediment were investigated in the Lake Taihu by using high-performance liquid chromatography in different seasons. At the same time, the concentrations of nitrogen and phosphorus and other physical and chemical indexes in the environment were determined by conventional methods. The result showed that total nitrogen, total phosphorus and dissolved total phosphorus concentrations in the water body varied significantly in space (P<0.05) and were in an order of Meiliang bay>Gonghu bay>Xukou bay. In addition, the concentrations of TP and iron-bound phosphorus (Fe-P) from surface sediments in Xukou bay were significantly lower than those in Meiliang bay and Gonghu bay (P<0.05). The epipelic algal biomass in the surface sediment was the highest in Gonghu bay with a value of (12.79±3.69) μg Chl.a/g, while the value of (2.46±1.14) μg Chl.a/g was the lowest in Xukou bay. Algal biomass in the surface sediment varied in an order of Gonghu bay>Meiliang bay>Xukou bay in autumn and summer, and in an order of Meiliang bay>Gonghu bay>Xukou bay in spring. In Xukou bay and Meiliang bay, algal biomass and Chl.b in the surface sediment was higher in spring and lower in summer and autumn, while in Gonghu bay, algal biomass in the surface sediment was high in autumn, followed by summer and spring. Based on pigment ratios of Chl.b (Fuco, Zea) to Chl.a, the algal community was dominated by diatom, followed by cyanobacteria in the surface sediments of Lake Taihu. The results of redundancy analysis (RDA) showed that the phosphorus in the surface sediment, especially the concentration of inorganic phosphorus, was the major environmental factor affecting the development of epipelic algae. The results can provide references for further understanding the ecological functions of epipelic algae and eutrophication control in the Taihu Lake.
- epipelic algae,
- characteristic pigment,
- the Taihu lake,
- distributional features

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References(23)

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