Characterization of the nonpoint source pollution into river at different spatial scales

Wang, Kang; Lin, Zhongbing

doi:10.1111/wej.12345

Cited by 7 publications

(2 citation statements)

References 41 publications

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“…For example, agricultural activities (crop tillage, planting, management measures) and rainfall can change the watershed's topography, vegetation cover, land use types, and soil nutrient enrichment status. Changes in these factors affect the path and speed of surface runoff confluence, the source of the catchment, and the infiltration and transport process of rainfall runoff, and thus affect the loss of soil nutrients into rivers along with runoff [7,8]. In runoff erosion areas, rainfall is the main driving force of soil nitrogen and phosphorus into water [9].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Nitrogen Output during Typical Rainfall in Different Sugarcane Growth Stages in a Southern Subtropical Watershed

Guo

Wang

et al. 2023

Agriculture

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Excessive fertilizer application, majorly nitrogen- and phosphorus-based fertilizers, in farmland has intensified environmental pollution of rivers, lakes, and other surface water bodies worldwide by agricultural non-point sources, especially the highly-mobile nitrogen. To solve nitrogen pollution in sugarcane areas, exploring the nitrogen output characteristics of agricultural watersheds in crop fields becomes necessary. Therefore, the objective of the study was to evaluate the characteristics of nitrogen output during typical rainfall events in different sugarcane growth stages in a southern tropical watershed in China. Dynamic monitoring of runoff and nitrogen concentration was carried out for four rainfall events and compared among four sugarcane growth stages (Establishment; Vegetative growth; Grand growth; Ripening) during the growing season of 2018 in the Nala watershed, Kelan Reservoir, Guangxi, China. The results showed that the total dissolved nitrogen flux of the 4 rainfall events ranged from 0.08 to 9.88 kg·hm−2 for the different growth stages. Nitrate nitrogen was the main component of the total flux, accounting between 75.7 and 92.1% of the total dissolved nitrogen while ammonium nitrogen accounted between 1.80 and 5.26% of the total flux for the 4 rainfall events. Total dissolved nitrogen and nitrate-nitrogen were significantly and negatively correlated with runoff (p < 0.05), while total dissolved nitrogen concentration did not correlate with runoff. The incipient scouring effect of total dissolved nitrogen and nitrate-nitrogen was not noticeable. The concentration of total dissolved nitrogen in the Nala watershed was inferior to class V water quality standard, indicating water eutrophication danger. The study showed that nitrogen nutrient inflow into the river was promoted by N-fertilization time and rainfall. Therefore, reasonably reducing N-fertilization dose and post-rain fertilization could effectively reduce nitrogen inflow into rivers and avoid the intensification of eutrophication in sugarcane areas. We recommend multiple years of studies to verify the possible impacts of differences in weather conditions.

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Section: Introductionmentioning

confidence: 99%

Characteristics of Nitrogen Output during Typical Rainfall in Different Sugarcane Growth Stages in a Southern Subtropical Watershed

Guo

Wang

et al. 2023

Agriculture

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“…For the assessment of basin pollution risk caused by NPS pollution, comprehensive impact factors need to be considered [37]. By examining the literature and taking into consideration the process of pollutant production and reduction, in this study we select nitrogen, phosphorus, soil erosion intensity, distance, slope, and rainfall levels as the main factors contributing to NPS in order to evaluate the risk of NPS pollution in watersheds [38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Water Resource Risk Assessment Based on Non-Point Source Pollution

Yuan

Zhang

2021

Water

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As one of the most important causes of water quality deterioration, NPS (non-point source) pollution has become an urgent environmental and livelihood issue. To date, there have been only a few studies focusing on NPS pollution conforming to the estimation, and the pollution sources are mainly concentrated in nitrogen and phosphorus nutrients. Unlike studies that only consider the intensity of nitrogen and phosphorus loads, the NPS pollution risk for the China’s Fuxian Lake Basin was evaluated in this study by using IECM (Improve Export Coefficient Model) and RUSLE (Revised Universal Soil Loss Equation) models to estimate nitrogen and phosphorus loads and soil loss and by using a multi-factor NPS pollution risk assessment index established on the basis of the data mentioned above. First, the results showed that the load intensity of nitrogen and phosphorus pollution in the Fuxian Lake Basin is low, so agricultural production and life are important sources of pollution. Second, the soil loss degree of erosion in the Fuxian Lake is mild, so topography is one of the most important factors affecting soil erosion. Third, the risk of NPS pollution in the Fuxian Lake Basin is at a medium level and its spatial distribution characteristics are similar to the intensity characteristics of nitrogen and phosphorus loss. Nitrogen, phosphorus, sediment, and mean concentrations are important factors affecting NPS pollution. These factors involve both natural and man-made environments. Therefore, it is necessary to comprehensively consider the factors affecting NPS in order to assess the NPS risk more accurately, as well as to better solve the problem of ecological pollution of water resources and to allow environmental restoration.

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Contribution of non-point source pollution that migrated with underground runoff process based on the SWAT model and a digital filter algorithm

Liu

Wang

Miao

et al. 2023

Environ Sci Pollut Res

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Characterization of the nonpoint source pollution into river at different spatial scales

Cited by 7 publications

References 41 publications

Characteristics of Nitrogen Output during Typical Rainfall in Different Sugarcane Growth Stages in a Southern Subtropical Watershed

Characteristics of Nitrogen Output during Typical Rainfall in Different Sugarcane Growth Stages in a Southern Subtropical Watershed

Water Resource Risk Assessment Based on Non-Point Source Pollution

Contribution of non-point source pollution that migrated with underground runoff process based on the SWAT model and a digital filter algorithm

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