RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2015, Vol. 24 >> Issue (05): 853-859.doi: 10.11870/cjlyzyyhj201505019

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SPATIAL DISTRIBUTIONS OF CARBON, NITROGEN AND PHOSPHORUS IN VARIOUS MEDIUMS OF THE XIANGXI RIVER WATERSHED AND THEIR CORRELATIONS

SUN Ting-ting1,2, TANG Tao1, SHEN Heng-lun1,2, ZHANG Chang-qun1,2, SUN Mei-qin1, LI Bin1,2, CAI Qing-hua1   

  1. 1. State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2014-03-17 Revised:2014-06-16 Online:2015-05-20
  • Contact: 唐涛 E-mail:angtao@ihb.ac.cn

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Abstract: Studying the correlations of biogenic elements between terrestrial and aquatic systems is essential for understanding the source and migration processes of these elements in the whole watershed. To comprehend the spatial distributions and correlations of total organic carbon (TOC), total nitrogen (TN) and total phosphorus (TP) in the aquatic and terrestrial components of the Xiangxi River watershed, we investigated concentrations of these three biogenic elements in riparian soil, stream water and stream sediments from 76 sites. The results showed that more than 60% sampling sites belonged to "abundant" or "relative abundant" condition for TOC and TN in riparian soil, and the concentrations of TOC, TN, and TP in the river sediments were markedly higher than those of many other rivers. The concentrations of TP in stream water that adjoin phosphorus-mining area were dramatically higher than those of other reaches. From the perspective of stream orders, the concentrations of TOC in the riparian soil were significantly higher in the first-order sites than those of the fourth-order sites. TN, C/P ratio and N/P ratio of the riparian soil and N/P ratio of the sediments were notably higher in the first-and second-order sites than that of the fourth-order sites, but the C/P ratio of the sediments was considerably higher in the first-order than the third-and fourth-order sites. Considering stream water, there was no significant difference among stream orders for neither the concentrations of the elements nor their ratios. Our findings imply that fertilizer utilization and phosphorus exploitation had significant impacts on spatial distributions and correlations between terrestrial and aquatic systems of these three biogenic elements in the watershed.

Key words: biogenic elements, riparian soil, stream water, sediment, stream order, watershed

CLC Number: 

  • X17
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