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Abstract
Abstract Taking the eutrophic Taige canal and Caoqiao River in the upper reaches of North Taihu Lake as the experimental objects, 12 monitoring points were set up and data were recorded. The distribution pattern of aquatic plants in the water landscape belt was studied by variance/mean ratio, aggregation intensity index, negative binomial parameter, Cassie index and α–diversity index. Based on the principle of aquatic plants repairing eutrophic water, a suitable water environment was selected. The effect of ecological restoration was studied by photometry. The results showed that: the main aquatic plant communities in this area evolved from submerged to floating leaf and emergent plants, which shows that the vertical distribution pattern of the aquatic plant communities was greatly affected by hydrology; the distribution pattern of aquatic plant diversity showed a good single curve in the vertical direction and a single curve in the horizontal direction; the results of ecological restoration showed that the average removal rates of total nitrogen (TN) and total phosphorus (TP) by mixing the three plants were 86.76% and 93.89%, respectively. Among them, the best combination for TN removal was water hyacinth (Eichhornia crassipes) + lytchus (Lythrum salicaria) + calamus (Acorus calamus), and the best combination for TP removal was water hyacinth + lytchus + hibiscus (Nelumbonucifera).
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