[1]ZHANG Xiaolei,PEI Yingchun,XIA Zhanghui,et al.Characteristics of Nitrogen Loss from Corn Field Surface Runoff in Typical Fluvo-aquic Soil Area of the Lower Reaches of the Yellow River[J].Research of Soil and Water Conservation,2023,30(05):113-121.[doi:10.13869/j.cnki.rswc.2023.05.038.]
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Characteristics of Nitrogen Loss from Corn Field Surface Runoff in Typical Fluvo-aquic Soil Area of the Lower Reaches of the Yellow River
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 05
Page number:
113-121
Column:
Public date:
2023-08-10
- Title:
- Characteristics of Nitrogen Loss from Corn Field Surface Runoff in Typical Fluvo-aquic Soil Area of the Lower Reaches of the Yellow River
- Keywords:
- nitrogen loss; non-point source pollution; fluvo-aquic soil area; runoff; lower reaches of the Yellow River
- CLC:
- S157.1
- DOI:
- 10.13869/j.cnki.rswc.2023.05.038.
- Abstract:
- [Objective] The aim of this study is to explore the characteristics of nitrogen loss from corn field surface runoff in the fluvo-aquic soil area of the lower reaches of the Yellow River during the natural rainfall, and to provide reference for predicting surface runoff quality and preventing agricultural non-point source pollution. [Methods] Based on the method of positioning test, the continuous monitoring of dryland surface runoff quality under different rainfall conditions in summer was carried out. The concentration change process, loss level, intensity and influencing factors of TN(total nitrogen), DN(dissolved nitrogen), NN(nitrate nitrogen)and AN(ammonium nitrogen)in runoff were analyzed. [Results] The peak values of different forms of nitrogen concentration appeared in the early stage of runoff process, and then the concentration curve showed a downward trend with the continuation of rainfall. The EMC(event mean concentration)of TN, DN and NN in runoff exceeded or approached the class V water quality standard of China's surface water(2.00 mg/L). With the increase of rainfall intensity, the EMC of TN were 1.75, 1.72, 1.91 and 2.01 times higher than that of the class V water quality standard, respectively, indicating that there was an obvious risk of non-point source nitrogen pollution in the study area. The loss of TN in runoff was mainly DN, and NN was the main loss of DN. Their EMC contribution rates were 56.75%～80.99% and 72.78%～81.39%, respectively, but the rates were seemed greater under the medium and small rainfall conditions. The loss intensities and loss rates of TN, DN, NN, AN both increased with the increase of rainfall intensity, and their average values of every rainfall were 366.06, 227.38, 170.17, 35.47 g/hm2 and 39.55, 24.30, 18.07, 7.46 g/(h·hm2), respectively. Pearson correlation analysis showed that runoff and TSS(suspended solids)had little effect on the concentration of AN, but had a very obvious effect on the concentrations of TN, DN and NN, and there was a significant positive correlation between TN, DN, NN concentrations and runoff under the medium and small rainfall conditions(p<0.05), and it seemed that the correlation was more significant under the smaller rainfall condition(p<0.01). Pearson correlation analysis also showed that the concentration of TN was both affected by runoff and TSS(p<0.05)under the condition of heavy rain and rainstorm, and the greater of the rainfall intensity was, the more stronger of their impact, but the impact on DN and NN concentration didn't reach the significant level. [Conclusion] There were significant differences in the characteristics of nitrogen losses of various forms in summer maize field runoff in the fluvo-aquic soil area of the lower reaches of the Yellow River. Appropriate nitrogen loss prevention and control strategies could be adopted based on the magnitude of rainfall intensity, and controlling runoff and reducing soil erosion could be of great significance to improving the efficiency of nitrogen loss prevention and control.
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Last Update:
2023-08-10