久久精品30_一本色道久久精品_激情综合视频_欧美日韩一区二区高清_好看的av在线不卡观看_国产自产精品_91久久黄色_午夜亚洲福利_欧美黄在线观看_国内自拍一区

Environmental experts are trying to find an effective way to improve the water quality of a scenic lake in Southwest China's Yunnan Province.

Blue-green algae have spread rapidly in Xingyun Lake near Kunming, the capital of Yunnan.

Early this month, experts from the Aquatic Organism Institute of the Chinese Academy of Sciences gathered to debate how to keep the algae under control, but the final solution is still under discussion, according to the environmental protection authorities in the city of Yuxi.

Some experts suggested raising fish and clams that can feed on the weed. Others suggested growing aquatic plants or using a microbial pesticide.

However, the temperature, rainfall and other local climatic and geographic conditions will have a direct bearing on the suitability of any proposed solution, said a bureau official who declined to be identified.

Scientists describe blue-green algae as an ecological cancer for water. The algae reproduce rapidly during hot weather in water that contains too many nutrients and they can severely pollute the water.

Blue-green algae are also known scientifically as cyanobacteria.

The algae sometimes make water appear green in colour and sometimes form a blue-green scum on the surface of the water. They also produce a foul smell. The algae are toxic and the toxins may kill pets and other animals and even be poisonous to humans.

According to experts, a combination of drought, high summer temperatures, reduced water flow and increased turbidity have all played their part in creating conditions for algae growth in Xingyun Lake.

(China Daily June 21, 2002)