Serious pollution in artificial lakes requires correct management-Fornitore globale

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Serious pollution in artificial lakes requires correct management

The current water pollution problem in China's lakes is very severe. The investigation and evaluation of the water quality and eutrophication status of 76 major lakes in China show that there are 5 lakes belonging to Class II water quality, accounting for 75% of the surveyed lakes, with an area of 11352 square kilometers, accounting for 61% of the total surveyed lakes; There are 16 lakes belonging to Class III water quality, accounting for 239% of the surveyed lakes, with an area of 21545 square kilometers, accounting for 118% of the total surveyed lakes; There are 18 lakes belonging to Class IV water quality, accounting for 269% of the surveyed lakes, with an area of 10? 3937 square kilometers, accounting for 556% of the total surveyed lake area; 11 lakes belong to Class V water quality, accounting for 146% of the surveyed lakes, with an area of 47681 square kilometers, accounting for 256% of the total surveyed lakes; There are 17 lakes with poor water quality, accounting for 253% of the surveyed lakes, covering an area of 15415 square kilometers, accounting for 0.9% of the total surveyed lakes. About 20% of the lakes have good water quality (II-III), and more than 80% of the lakes are polluted (IV-VIV).

The evaluation results of eutrophication in 67 major lakes show that there are zero lakes classified as poor nutrient and 18 lakes classified as moderate nutrient, accounting for 269% of the total surveyed lakes and covering an area of 70 hectares? 1311 square kilometers, accounting for 376% of the total surveyed lake area. There are 49 eutrophic lakes, accounting for 731% of the surveyed lakes, with an area of 11 square kilometers? 63255 square kilometers, accounting for 624% of the total surveyed lake area, which means that in terms of the number of lakes, nearly three-quarters of them have reached eutrophication level, and the area occupied is also close to two-thirds of the total area, indicating that the eutrophication problem of lakes in China is very prominent at present.

The lakes in the middle and lower reaches of the Yangtze River are mostly shallow water lakes, and with suitable climate conditions, the productivity of lakes is high. In order to effectively develop and utilize large water surfaces to generate economic benefits, the technology of net aquaculture was developed and gradually popularized in the 1970s and 1980s. It played a certain role in solving the current food shortage and changing people's food structure. With the continuous development of the economy and the improvement of dietary consumption levels, using low-cost open lake surfaces for high-value aquaculture has become the way for water town people to become prosperous. In addition, due to the loss of macro management, net aquaculture in lakes has become rampant, and the area continues to expand. The net aquaculture in many lakes has far exceeded the capacity of the lakes themselves, and the aquatic ecosystem of lakes has been destroyed. The large-scale artificial feeding of bait has accelerated. The eutrophication process of lakes.