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Peiying Li, National Marine Environmental Monitoring Center (China)
xiaolong Zhang, Yantai University (China)
Ping Li, First Institute of Oceanography,SOA (China)
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Coastal wetland is an important type of wetlands, one of the highest productivity of ecosystem on the earth. Due to its remarkable primordial, vulnerability and scarcity, the Modern Yellow River Delta Coastal Wetlands (MYRDCW), as a place for birds to inhabit, reproduce and migrate, plays a very important role internationally. Supported by findings from field surveys and means of remote sensing (RS), the research in this paper studies its environmental change. MYRDCW has evolved and developed on the lobe of deposit body. It has close relationship with water and sand in Yellow River (YR).
From 1976 to1996, during the period when YR flowed along Qingshuigou, the development of new lobe has undergone four phases: outspread on the plane shaped like a sector, expansion on lengthwise orientation, enlargement on widthwise orientation and alteration after abandoned. Because of the decrease of the amount of sand sources in YR since it changed its course at Qing 8 in 1996, the new spit of the river mouth started to have the characteristic of frequent alternated between erode and silt. Impacted by human activities, the development of coastal wetland has shown new characteristics. The disturbance from sources including mankind and the nature are external conditions for it to develop and evolve continuously.
Experimental data indicates that silt is the predominant component in MYRDCW. The environmental chemical characteristics differentiate each other remarkably among different regions such as the current outfall area, abandoned outfall area and oil field area. Under the different habitats of reed, iodine weed, chionese tamarisk and beach land, all factors what have tested also show apparent differences.
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