| Cite this article: | 李韶慧.贵州高原平寨水库春季叶绿素a浓度的分布及其影响因素[J].灌溉排水学报,,():-. |
| lishaohui.贵州高原平寨水库春季叶绿素a浓度的分布及其影响因素[J].灌溉排水学报,,():-. |
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| Distribution of chlorophyll-a concentration in spring and its influencing factors in Pingzhai Reservoir, Guizhou plateau |
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lishaohui
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Guizhou Normal University
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| Abstract: |
| Chlorophyll a is an important indicator to characterize the phytoplankton stock, and studying its relationship with the environmental factors of lakes and reservoirs is of great significance for understanding the mechanism of lakes and reservoirs eutrophication. Takes the chlorophyll a of the Pingzhai Reservoir in May 2018 as the research object, and connecting with the 21 samples of the pH, DO, EC, SD, chlorophyll a, Wt, TN, NH4+-N, TP, COD and other monitoring indicators of the surface waters, the inverse distance weighted interpolation method was used to study the spatial distribution characteristics of chlorophyll a, and correlation analysis was applied. The method and multiple stepwise regression method were used to explore the relationship between chlorophyll a concentration and water physical and chemical factors; and the logarithmic power function universal index formula was used to evaluate the nutritional status of Pingzhai Reservoir. The results showed that the chlorophyll a concentration of Pingzhai Reservoir in spring was between 0.82-30.50 μg·L-1, with an average concentration of 12.56±1.9 μg·L-1. The distribution of chlorophyll a concentration in different regions was significantly different. The average concentration of chlorophyll a in NY, BS and KQ were higher, and the average concentration of chlorophyll a in HJ was lowest. chlorophyll a was significantly positively correlated with EC, TN, NH4+-N (P <0.05); TP was the main limiting factor for its eutrophication; Of the sampling points in Pingzhai Reservoir, 14 were in the “mediotrophic level” and 7 were in the “eutrophic”. |
| Key words: Chlorophyll-a; influencing factors; condition of nutrition; Pingzhai Reservoir |
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