Study On The Yellow River Estuary Entironment Status And Its Influencing Factors

The Yellow River takes huge quantity of fresh water, silt and various nutrition in the ocean every year, has formed the good ecological environment suitable for growing, developing of marine organisms in the river estuary and inshore district, the estuary water areas of the Yellow River is a very important river estuary ecosystem, and the main biological spawning ground , field for hatching the young , feeding ground of fishery in the Bohai Sea. Since the seventies of last century, because the land sewage quantity increases and the Yellow River flux entering the sea decreases, this sea area environmental quality drops, has caused the economic spawning ground of marine organisms to disappeared, fishery resources are destroyed, perch at the bottom bio-diversity sharply decreases, the marine ecological environment worsens seriously. The selected title has important meanings for investigating and expounding the state of ecological environment of this sea area and variation tendency in the future, and offers rational science basis for improving and protecting the ecological environment of the Yellow River estuary and near sea area.Through 2005 investigating current status, such as the Yellow River estuary and near environmental quality status, the living resources and biological quality in the sea area, etc., has found the main ocean ecological problems existing in this sea area, chooses a lot of appraisal factors from the three respects of environment, biology community and ecosystem function, adopts the analytic approach to confirm the weight of each appraisal factor, sets up the estuary ecosystem health composite index of the Yellow River and appraise models, analyses the environmental health degree of the Yellow River estuary and near sea area synthetically, and has analysed the main factor that may exert an influence on this sea area marine ecological environment .The main conclusion is as follows:â‘´Water quality status...