RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (04): 630-637.doi: 10.11870/cjlyzyyhj201604013

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OCCURRENCE CHARACTERISTICS AND BIO-AVAILABILITY OF NITROGEN FRACTIONS IN SEDIMENTS OF DANJIANGKOU RESERVOIR

ZHAO Li1, JIANG Xia1, WANG Wen-wen1, WANG Shu-hang1, CHANG Le2, CHEN Jun-yi1   

  1. 1. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China;
    2. Nanyang Research Institution of Environmental Protection Science, Nanyang 473000, China
  • Received:2015-07-20 Revised:2015-12-24 Online:2016-04-20
  • Supported by:
    Sediment Survey of Lakes in Eastern China (2014FY110400-01)

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Abstract: In order to reveal the spatial distribution and bio-availability of nitrogen speciation in sediments of Danjiangkou Reservoir, the exchangeable nitrogen (EN), the acid hydrolysable nitrogen (HN) and the residue nitrogen (RN) in the surface sediment were analyzed by sequential extraction method. The results show that TN in the Danjiangkou Reservoir was 425-5796 mg/kg, with the mean value of 1319.32 mg/kg, the average value of EN, HN and RN relative proportions is 2.15: 1.95: 1, and the spatial distribution of various forms of nitrogen content in warehousing river is higher than the reservoir, especially in Danjiang, Laoguan river and the mouth of Jiang river - Du river. Nitrogen mineralization potential was 40.20-1468.95mg/kg, with the mean value of 275.06 mg/kg; the exchangeable nitrogen's contribution to the danjiangkou reservoir sediment PMN is bigger, ratio between 19.85%-90.80%, with the average of 63.47%. Migration and transformation of different forms of nitrogen happened in different water environment conditions, keeping dynamic balance between water and sediment.

Key words: sequential extraction methods, nitrogen speciation, sediment, bio-availability, Danjiangkou reservoir

CLC Number: 

  • X524
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