The eco-environmental characteristics and variation trends around Chengdao Oilfield sea areas in the Yellow River Estuary

doi:10.3969/j.issn.1001-909X.2015.03.011

Abstract

Abstract: In order to find out the eco-environmental characteristics and variation trends around the Chengdao Oilfield sea areas in the Yellow River Estuary, using the methods of single factor index and comprehensive index, the monitoring data of the seawater and sedimentary quality over years were evaluated, and the changes of marine biology around the Chengdao Oilfield sea areas were also analyzed. The results showed that except for inorganic nitrogen in 2009, 2010, 2011, and phosphate in 2011, the water quality of the investigated areas reached the second-class water quality according as The Chinese National Standard of Seawater Quality. The sedimentary quality of the investigated areas reached the first-class sedimental quality according as The Chinese National Standard of Sediment Quality. The oil contents of sea water and sediment in 2006-2011 had a good corresponding relation with the annual oil production of Chengdao Oilfield. Offshore oil development caused a reduction in the total number of phytoplankton and benthic species, and the total density, biomass and community diversity index of benthos also declined. The offshore oil development caused some negative impacts on the environment around Chengdao Oilfield sea areas.

Key words: The Yellow River Estuary, Chengdao Oilfield, seawater quality, sediments, marine biology

CLC Number:

X834

ZHANG Liang, YE Fang, WANG Jin-wen, ZHANG Nai-xing, SU Kai, ZHANG Shao-ping, SUN bin, QU Wen, TAO Hui-hui. The eco-environmental characteristics and variation trends around Chengdao Oilfield sea areas in the Yellow River Estuary[J]. Journal of Marine Sciences, 2015, 33(3): 75-83.

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