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Volume 30 Issue 1
Mar.  2011
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Article Navigation >  CARSOLOGICA SINICA  > 2011  >  30(1): 9-15
XIE Wei-fang, XIA Pin-hua, LIN Tao, ZHANG Bang-xi, ZHAN Jin-xing, HU Ji-wei. Distribution and migration of different forms of nitrogen among overlying water, pore water and sediments in karst mountain stream—A casein the Maixi River[J]. CARSOLOGICA SINICA, 2011, 30(1): 9-15. doi: 10.3969/j.issn.1001-4810.2011.01.002
Citation: XIE Wei-fang, XIA Pin-hua, LIN Tao, ZHANG Bang-xi, ZHAN Jin-xing, HU Ji-wei. Distribution and migration of different forms of nitrogen among overlying water, pore water and sediments in karst mountain stream—A casein the Maixi River[J]. CARSOLOGICA SINICA, 2011, 30(1): 9-15. doi: 10.3969/j.issn.1001-4810.2011.01.002
shu

Distribution and migration of different forms of nitrogen among overlying water, pore water and sediments in karst mountain stream—A casein the Maixi River

doi: 10.3969/j.issn.1001-4810.2011.01.002

  • Guizhou Key Laboratory for Mountainous Environ mental Information and Ecological Protection, Guizhou Normal University

  • Received Date: 2011-12-06
  • Publish Date: 2011-03-25
    Abstract
  • Distribution and migration of nitrogen among overlying water, pore water and sediments are investigated in the Maixi River, the results indicate that in overlying water, the content of different forms of nitrogen assumes an order NO-3-N (tric nitrogen)> NH+4-N (ammonicacal nitrogen)> NO-2-N (trite nitrogen); while the content of dissolved inorganic nitrogen(DIN)in pore water assumes an order NH+4-N> NO-3-N > NO-2-N.Content of total nitrogen and fixed am monium(F-N H4)is1110.67～4413.16mg/kg and34.56～170.05mg/kgin sediments, accounting for1.47%～6.25% of total nitrogen; the content of different forms of exchangeable nitrogen in sediments assumes an order NH+4-N> NO-3-N > NO-2-N. Content of NH+4-N in pore wateris2.65～19.51 times higher than that in overlying water, and content of NO-3-N in overlying water is 7.14～20.43 times higher than that in pore water’s N in sediments has significant positive correlations with the content of DIN, NH+4-N in pore water, exchangeable nitrogen and exchangeable NH+4-N in sediments; in sediments, exchangeable NO-3-N has significant positive correlations with the content of exchangeable NH+4-N and exchangeable nitrogen, and exchangeable NH+4-N has significant positive correlations with the content of exchangeable nitrogen. DIN in pore water has significant positive correlations with the content of NH+4-N in pore water. Migration of nitrogen in the Maxi River is shown as follows: with a concentration gradient, NO-3-N in overlying water is diffuse into pore water, finally accumulated in sediments, while the exchangeable NH+4-N in sediments is released into the pore water and further into the overlying water.

     

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