The Shanghai Water Authority yesterday began planting sequoia trees around the Qingcaosha Reservoir as a way to curb eutrophication in a project that will see around 700 trees planted within the next three years.
The reservoir, at the mouth of the Yangzte River delta, is one of the main sources of tap water in the city, but signs of eutrophication were first spotted there last year. The Water Authority believes that the trees will reduce the amount of nitrogen and phosphorus in the water and prevent algae growth.
Shanghai Daily reports:
About 700 trees will be planted in three years to stem eutrophication which leads to excessive plant growth and decay, said Shen Yichen, general manager of the Chengtou Raw Water Co, the reservoir’s operator.
“The eutrophication cannot be done away with completely but can be controlled with tree planting and other measures,” Shen told Shanghai Daily yesterday.
A total of 400,000 square meters of trees will be planted on the south bank of the reservoir by 2015, while another 2.4 square kilometers of trees will be planted on the middle island called Qingcaosha, he said.
The pollutants contaminating the reservoir come mostly from upstream factories, according to the Daily.
Last month, a number of dead pigs piled up on the shore of the Huangpu river, rekindling memories of last year’s disgusting hogwash that ended with some 10,000 dead pigs being found in the river water after they were dumped by farmers in Jiaxing and Zhejiang province. No dead pig spottings have since been reported, luckily.
Coincidentally enough, yesterday was World Water Day, and statistics about water in China have shown that some 320 million people in the country are without access to clean drinking water, 40 percent of China’s surface water is considered polluted and 20 percent of drinking water in urban areas is polluted.