A study on quality of aquatic environment in Tumen River Area

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Identifying the sources of organic matter in marine and riverine sediments of Bohai Bay and its catchment using carbon and nitrogen stable isotopes

Carbon and nitrogen stable isotopes are useful tracers for distinguishing marine and terrestrial plant sources of sedimentary organic matter(OM),and for identifying OM from different types of plants.By analyzing the carbon and nitrogen stable isotopes of marine and riverine sediments from Bohai Bay and its catchment,we were able to identify the source of OM in these sediments.The stable carbon isotope values of Bohai Bay sediments were between-22.94‰ and-23.90‰,while those of riverine sediments were from-24.45‰ to-32.50‰.Marine algae were the main source of OM in Bohai Bay sediments.However,lacustrine algae were the main source of riverine sediments,not terrestrial OM.The nitrogen isotopes in Bohai Bay sediments decreased in eastward direction,with increasing distance from the coastline,which suggested a higher degree of impact from human activities along the coast.     

图们江地区水环境质量研究

图们江地区５条河流１８个断面水环境质量研究表明，本区地表水污染比较严重，大部分河流断面水质在Ⅳ、Ⅴ级水平，只有珲春河水质优于Ⅲ级，除布乐哈通河水质继续呈下降趋势外，其它河流污染水平基本得到了控制，河流污染物比较固定，主要是ＳＳ、ＣＯＤ、ＢＯＤ、ＡＲ－ＯＨ、Ｎ－ＮＨａ。