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Jiangsu coastal areas located in the middle of China's coastal economic zone, economic development is lagging behind, but there are broad prospects for development. In recent years, with the acceleration of the process of economic development and industrialization, estuarine ecological environment is facing tough challenges, estuarine areas of development and utilization of water resources is the most active, the most closely linked with economic and social development, the ecological environment is more fragile, high potential ecological risk This makes the region's ecological and environmental protection is necessary. The problem of heavy metal pollution and eutrophication important issues facing the ecological environment of the coastal estuaries. Papers start from the Jiangsu environmental quality of estuarine areas, the main line of heavy metals and nitrogen and phosphorus and other nutrients, respectively, to study the distribution characteristics of the estuarine surface water and surface sediment pollutants, concentration levels, quantitative and qualitative description of the estuarine environment quality and considering the effect of their ecological environment. Thesis the Jiangsu coastal estuaries heavy metal elements, the spatial distribution of nutrient elements and interrelationships. Metal elements more significantly to the pollution of Cd, Cu, Cr, Pb and Zn. Unpolluted; exceeded the rate of total phosphorus in the nutrition elements and excessive multiples higher than the total nitrogen, available phosphorus proportion is less than the available nitrogen. proportionate share. The complexity of the relationship between these elements and organic matter, relative granularity, major elements, the general characteristics of a good correlation with the nitrogen and phosphorus and organic matter, and inversely proportional to the content of heavy metals and major elements of a good correlation, relative granularity of heavy metals, nutritional elements . The papers also discuss the main factors affecting the distribution of sediment and pollution characteristics by region (North, Central, South). The former includes sediment properties (such as organic matter and clay content, etc.), environmental conditions, human impact, biological role, where human influence is more prominent: the latter by principal component analysis to discuss the regional distribution of pollutants (northern, central, southern) and pollution characteristics. In accordance with different geographical sources and causes of local pollutants from industrial structure and geological structure analysis. Higher than the northern part of the estuary, south of the estuary of the nitrogen and phosphorus from a regional point of view, does not lie in the size of the estuary and its content, but rather the strength of the impact of human activities; irrigation estuary, the main point distribution of heavy metals in high value Sheyang estuary industrial enterprises affect a significant place. Jiangsu coastal estuarine areas relatively fragile ecology, ecological risk assessment is particularly important, the evaluation of heavy metals and N respectively, P ecological environmental effects, evaluation of the use of classic Hakanson ecological risk index method and M (?) Ller geological accumulation index method (I geo << / sub> / sub> evaluation of heavy metal elements in Jiangsu coastal estuary, the largest ecological risk Guannan, Sheyang, Lianyungang, Dafeng, Qidong, followed by: the Dongtai minimum nutritional elements evaluated using standard pollution index method, reference Environment and Energy of Ontario, Canada, to develop sediment quality evaluation criteria, by comparing the following conclusions: from the degree of nutrient enrichment,
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