Trees planted to curb eutrophication
March 25, 2014 Category Environment, Greenhouse gas emissions
The Shanghai Water Authority began planting sequoia trees in and around the Qingcaosha Reservoir in an effort to curb eutrophication. The reservoir, which is at the mouth of the Yangtze river, is a major source of tap water in Shanghai. 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. 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. The trees are expected to reduce the amount of nitrogen and phosphorus materials in the water as well as prevent the growth of algae that threatens water quality. The Water Authority is also restoring wetland in and around the reservoir besides introducing algae-eating fish. Signs of eutrophication were first spotted last year, and there are also risks of salt tides.
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