RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2015, Vol. 24 >> Issue (07): 1150-1156.doi: 10.11870/cjlyzyyhj201507010

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DISTRIBUTION AND EVALUATION OF NUTRIENTS FROM WATER, SUSPENDED SEDIMENT AND SURFACE SEDIMENT IN THE MAIN STREAM OF THE XITIAOXI RIVER

LI Zheng-yang, YUAN Xu-yin, WANG Huan, XU Hai-yan, CHEN Hai-long, LU Chao-peng   

  1. College of Environment Hohai University, Nanjing 210098, China
  • Received:2014-07-21 Revised:2014-11-04 Online:2015-07-20
  • Contact: 袁旭音,E-mail:yxy_hjy@hhu.edu.cn E-mail:yxy_hjy@hhu.edu.cn

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Abstract: Understanding the distributions of nutrients in different medium can help to fully grasp the current situation of river environments. To investigate the distribution characteristics, pollution degree and relationships of nutrients in the main stream of the Xitiaoxi River, water, suspended sediment and surface sediment samples were recently taken from 11 sites along this River. These data can help us to recognize the nutritional levels of diverse sections in the mainstream. The results showed that, the concentrations of TN and TP in the waters were higher in the wet season than in the dry season from upper reaches to lower reaches of the Xitiaoxi River. The contents of TP showed they were worse than Grade Ⅲ level of National Environment Quality Standard for Surface Water in half of total sites. In contrast, the concentrations of TN showed that they were worse than Grade V of the surface-water standard (GB3838-2002). NH3-N in the wet and dry seasons all reached level Ⅱ and Ⅲ, respectively, in the middle and lower reaches. The overall NH3-N pollution showed the pattern of lower reaches> middle reaches> upper reaches. Therefore, compared to phosphorus pollution, nitrogen pollution of water was more serious in the Xitiaoxi River. The contents of TN in suspended matter basically increased with an order of the upper reaches, lower reaches, and middle reaches from high to low, and the contents of TP showed an order of the upper reaches, middle reaches, and lower reaches. The contents of organic matter of upper reaches were higher than those of lower reaches and middle reaches. The maximum of both TN and organic matter appeared in XTX1 of upper reaches, which indicated a high organic matter and nitrogen values in forested lands. Inorganic phosphorus took up a higher proportion than organic phosphorus in sediment TP, which indicated that inorganic phosphorus was the main form of phosphorus forms. Although inorganic nitrogen accounted for a small proportion of TN, they can indicate a good water quality. Results from statistical correlation analyses showed that TN content in suspended sediment was obviously positively correlated with OM (r =0.974, p<0.01). TN of all sites in waters were correlated with the nutrients in suspended sediment. No significant relationship was found between nutrient in sediment and TN, TP in water, which indicated that sediment could not reflect the status of water quality in basin well. Therefore, control and treatment of water pollution in Xitiaoxi River should focus on abatement of suspended matter in water.

Key words: nutrient, water, suspended sediment, sediment, Xitiaoxi River

CLC Number: 

  • X522
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