Ecosystem Health and Risk Assessment of the North Jiangsu Shoal

Complex underwater topographies, such as the middle radial sand ridges and the northern Haizhou bay underwater shoal, and special marine dynamic surroundings form the typical shoal wetland ecosystems of the North Jiangsu shoal. Previous researches were focused in the forms of morphogenesis and the characteristic of conformation of sand ridges and shoal. Few studies have done on ecosystem health and risk assessment. Due to long-term environmental pollution and over-exploitation and other reasons, overall coastal water environmental quality of northern Jiangsu has continued to drop. Especially. in recent years, with many large projects such as LNG nuclear power project and Chemical Park projects has been implemented, the sea and land-sourced pollution increasing,,, environment ecosystem must burden more pressure. The serious environment pollution and local eutrophication have become increasingly prominent. Studying the ecological monitoring results and the previous research results shown that pollution in the waters there are mainly inorganic nitrogen, active phosphate, suspended solids, mercury, and chemical oxygen demand, oil, etc., and land-sourced pollution into the sea near the outlet waters even more serious pollution. Researches shown that Sea, land-sourced pollution and beach reclamation was the most serious threat factor of shoal wetland ecosystem health. At the same time a few problems which must deserve our attentions were offered.