15N isotope tracing of nitrogen runoff loss on red soil sloping uplands under simulated rainfall conditions

H.J. Zheng, J.C. Zuo, L.Y. Wang, Y.J. Li and K.T. Liao
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H.J. Zheng: Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention, Nanchang, P.R. China
J.C. Zuo: Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention, Nanchang, P.R. China
L.Y. Wang: Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention, Nanchang, P.R. China
Y.J. Li: Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention, Nanchang, P.R. China
K.T. Liao: Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention, Nanchang, P.R. China

Plant, Soil and Environment, 2016, vol. 62, issue 9, 416-421

Abstract: Stable isotope 15N tracer technique was used in combination with artificial rainfall simulation to study the influence of interflow and surface-flow on nitrogen (N) migration loss of soil-plant systems on typical red soil sloping uplands. This study also investigated the utilization efficiency of fertilizer N during different peanut plant growth stages. The results indicated that soil N loss was predominantly via interflow and erosive sediment. Fertilizer N loss during the initial growth stage was mainly through surface runoff, while that occurred as interflow increased from less than 5% to around 16% during the middle and late growth stages. The loss of fertilizer N through surface runoff, erosive sediment and interflow accounted for over 18% of the total N application. The utilization rate of fertilizer N by peanut plants was around 45% through its life cycle, and that 70% of N absorbed by this plant derived from the soil. This highlighted the importance of adopting effective methods to reduce nutrient loss through interflow and surface-flow, the need to increase the utilization rate of fertilizers, and the importance to maintain soil fertility at a relatively high level.

Keywords: soil erosion; vertical infiltration; leaching loss; nutrients; precipitation (search for similar items in EconPapers)
Date: 2016
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:62:y:2016:i:9:id:246-2016-pse

DOI: 10.17221/246/2016-PSE

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