Jiuduansha is a collection of four intertidal wetland shoals at the mouth of China's Yangtze River. They are administered as an island region of the municipality of Shanghai's Pudong New Area. These shoals and the submerged land surrounding them to a depth of form the. The entire area stretches roughly east to west and north to south, covering an area of, although only of this is above sea level. The area is considered one of the national urban wetland parks of China and forms part of the China Biosphere Reserve Network. A 1996 field study found that, for seven bird species investigated, the number present at Jiuduansha exceeded 1% of the world's total for the species, establishing it as a Wetland of International Importance.
Name
Although Jiuduansha literally translates as "Nine-Part Sands", the number nine is here being used in a colloquial way similar to English several. In fact, the group consists of four main shoals. These are sometimes given their Mandarin names of Shangsha, Zhongsha, Xiasha, and Jiangyanansha and sometimes translated as Upper, Middle, Lower, and. South Jiuduansha is known as Jiangya Nansha in Chinese after the pinyin romanization of the SS Kiangya, the passenger steamer which exploded nearby in 1948.
History
Jiuduansha originally formed part of the Waitongshashoal, but frequent floods of the Yangtze in 1949 and 1954 connected a series of troughs and separated Jiuduansha from the Tongsha shoal. Shanghai's universities have studied Jiuduansha since the 1990s and, in 1995, introduced cordgrass in order to speed the shoal's stabilization, particularly in light of roughly 70% reduction in sedimentation caused by the many dams erected along the course of the Yangtze during the 20th century. In March 2000 or 2003, the Shanghai municipal government established the nature reserve. The cordgrass and environmental protection were intended to accommodate birds then living at the site being developed as Pudong International Airport. From October 2002 to January 2003, Fudan University and the reserve's administration conducted four joint surveys and, in 2005, the wetland was upgraded to a national nature reserve. In the time since its introduction, the cordgrass has been found to have become invasive, aggressively crowding out the native reeds and bulrushes and degrading parts of the wetlands. A wetland museum, as well as a Science Popularization Park on about of the island, are planned to increase public awareness and support.
