Journal of Ecology and Rural Environment ›› 2021, Vol. 37 ›› Issue (6): 733-739.doi: 10.19741/j.issn.1673-4831.2020.0804

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Temporal and Spatial Variation Characteristics of Chlorophyll a and Analysis of Related Environmental Factors in the Estuary Area of Gehu Lake

LIU Yu1,2, YANG Fei2, ZHANG Yi-min2, GAO Yue-xiang2, ZHANG Zhi-wei2, ZHU Yue-ming2, KONG Ming2, ZHAO Yuan1, QIAN Wen-han1   

  1. 1. College of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China;
    2. Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
  • Received:2020-09-25 Online:2021-06-25 Published:2021-06-24

Abstract: Chlorophyll a (Chl-a), physical and chemical factors of water samples in the 13 estuaries of Gehu Lake were monitored and analyzed monthly for 2 years from January 2018 to January 2020.The spatio-temporal characteristics and their correlation with major environmental factors were studied such as water temperature, pH and nutrients. The results show that:(1) ρ(Chl-a) changed significantly over time, with the highest in summer, followed by autumn and winter, and the lowest in spring; (2) In terms of spatial distribution, ρ(Chl-a) in the estuary area of the northwest was significantly higher than that in the south of Gehu Lake; (3) ρ(Chl-a) is extremely significantly positively correlated with water temperature, pH, and permanganate index (CODMn), negatively correlated with DO, and had no significant correlations with ρ(TN), ρ(NH4+-N), ρ(NO3--N), ρ(PO43--P) and ρ(DOC). The logarithm of ρ(Chl-a) had a significant positive correlation with the logarithm of TP, and a significant negative correlation with the logarithm of N/P ratio; (4) Phosphorus was the main determinant of ρ(Chl-a) in the estuary area of Gehu Lake. The results can provide reference for the water environment treatment of Gehu Lake.

Key words: estuaries of Gehu Lake, chlorophyll a (Chl-a), environmental factors, correlation analysis

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