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[1]HU Xiaomian,LI Yanli,SUN Wei,et al.Identification of Nitrate Sources in Upstream Areas of Taizi River Basin in Different Hydrological Periods[J].Research of Soil and Water Conservation,2021,28(02):7-13+20.

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Identification of Nitrate Sources in Upstream Areas of Taizi River Basin in Different Hydrological Periods

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 02 Page number: 7-13+20 Column: Public date: 2021-02-06

Title:: Identification of Nitrate Sources in Upstream Areas of Taizi River Basin in Different Hydrological Periods

Author(s):: HU Xiaomian¹, LI Yanli¹, SUN Wei¹, YIN Xijie ²; (1.College of Resources and Environment, Henan Polytechnic University, Jiaozuo, Henan 454000, China; 2.Open Laboratory of Ocean & Coast Environmental Geology, Third Institute of Oceanography State Administration, Xiamen, Fujian 361005, China)

Keywords:: nitrate; stable isotope; chloride ion; the upstream of Taizi River; sources tracing

CLC:: X522

DOI:: -

Abstract:: In order to better control the nitrate pollution in the upstream areas of Taizi River Basin, the nitrate(NO^-₃), chloride(Cl^-), ammonium(NH⁺₄-N), δ¹⁵N-NO₃^-, δ¹⁸O-NO^-₃ and δ¹⁸O-H₂O were analyzed. The sources of nitrate in upstream areas of Taizi River Basin in different hydrological periods were identified. The results show that: Cl^-, NO^-₃, NH⁺₄-N concentrations and the δ¹⁸O-NO^-₃ in the dry season are significantly higher than those in the wet season, and the δ¹⁵N-NO^-₃ does not show significant seasonal variations; spatially, the nitrate concentrations in the north branch of Taizi River Basin(NTR)are significantly higher than those in the south branch of Taizi River Basin(STR)in the dry season; the Cl^- concentrations in STR were significantly higher than those in NTR in the wet season; the trends of Cl^- and NO^-₃ concentrations from the upper reach to the lower reach of NTR in the dry season are opposite with those in the wet season; the trends of Cl^- and NO^-₃ concentrations from the upper reach to the lower reach of STR in the dry season are consistent with those in the wet season. It can be concluded that the nitrate is derived mainly from the soil nitrogen in dry season, whereas it is from synthetic fertilizer and soil N in the wet season; moreover, the atmospheric nitrate deposition in the upper reaches of the soil may also be a source of the nitrate in the wet season. Nitrification occurs in the process of transport of nitrate from the soil to the river in the wet season. The nitrification process affects the nitrate concentration in NTR during the dry period.

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Last Update: 2021-02-10