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[1]ZHAO Yue,ZHANG Fu,CHEN Jin,et al.COD and TN Pollution Loads in Surface Runoff Under Different Land Uses in Anjiagou Basin[J].Research of Soil and Water Conservation,2017,24(01):103-108,114.

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COD and TN Pollution Loads in Surface Runoff Under Different Land Uses in Anjiagou Basin

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 24 Number of periods: 2017 01 Page number: 103-108,114 Column: Public date: 2017-02-28

Title:: COD and TN Pollution Loads in Surface Runoff Under Different Land Uses in Anjiagou Basin

Author(s):: ZHAO Yue¹, ZHANG Fu¹, CHEN Jin², ZHANG Bailin², KANG Qiyan¹; 1. College of Forestry, Gansu Agricultural University, Lanzhou 730070, China;
2. Dingxi Institute of Soil and Water Conservation, Dingxi, Gansu 743000, China

Keywords:: land use; non-point pollution; water quality of runoff; pollution load

CLC:: X5;P334

DOI:: -

Abstract:: In order to understand the distribution of COD and TN pollution in different land uses, selecting Anjiagou Basin as the research site, we used the average concentration model to analyze the runoff source and pollution load. The results showed that the concentrations of 7 pollutants in surface runoff were 1.31 times more than the standard under different land uses, in which COD_Mn and TN exceeded the standard 1.78 times and 2.11 times, respectively; the average occurrence frequency of the water quality worse than grade Ⅴ was 23.86%, COD_Mn and TN were 28.17% and 52.03%, respectively; because of the runoff, impounding efficiency and pollutant output level effect on different land uses, COD_Mn and TN pollution loads mainly distributed in the woodland and farmland, the waste hillside of pollution load was maximum in the unit area of COD_Mn and TN (2.989 kg/hm²), grassland came second (2.937 kg/hm²), woodland third (1.327 kg/hm²) was next, and agricultural land was minimum (0.447 kg/hm²); in the runoff process from slope to channel, due to the effect of soil infiltration and other factors, the total amount of pollutants had obvious attenuation, ρ (COD_Mn) and ρ (TN) decreased by 40.01% and 38.33%, respectively. The results showed that the COD_Mn pollution and TN pollution were significantly discrepant in different land use, and rational planning of land use, strengthening soil and water conservation measures could effectively reduce the occurrence of non-point source pollution.

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