Sedimentation rate (SR) and sources of organic carbon, nitrogen and phosphorus nutrients in sediment of the Ha Long Bay (Vietnam) were estimated and assessed by the use of the 210 Pbex technique and based on isotopic signatures of carbon and nitrogen (δ 13 C and δ 15 N) in organic matter presents in sediment. It was revealed that SR in Ha Long bay varied temporally and spatially. In the early 1900, SR ranged from 0.25 to 0.40 cm a -1 , but it gradually increased up to 0.5-2.1 cm a -1 in recent years. SR in the Bay decreased from the coast seawards. The temporal variation of SR was attributed to anthropogenic causes whilst spatial variation of SR was attributed to the difference of sediment sources supplied to the Bay. Concentrations of nitrogen and phosphorus in sediment are correlated with each other (R 2 = 0.86) implying the nutrients were from the same source. The δ 13 C in total organic matter (TOM) ranges from -26.58‰ to -24.78‰ and δ 15 N ranges from 4.45 to 5.56‰. The results obtained suggested significant contribution of terrestrial carbon of C3 plants into the aquatic environment of the Bay. The contribution of terrigenous organic carbon into the Bay was estimated to be as high as from 65 to 92%.
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