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Quantifying nitrate dynamics in deep vadose zone under irrigated farmland in the North China Plain: Insights from continuous in-situ monitoring
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DOI：10.1016/j.agee.2025.109956.png)
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Abstract
En 中文
• Nitrate-N accumulation in 45 m vadose zone reaches 6951 kg ha⁻¹, increasing by 90 kg ha⁻¹ annually. • Nitrate leaching velocity was 0.70 m year⁻¹, accelerated by increased extreme precipitation. • Denitrification potential was identified in deep vadose zone, but significantly constrained by low organic carbon. • Structural Equation Model clarified the primary mechanism influencing nitrate leaching.
Keywords:
Nitrate leaching
Deep vadose zone
North China Plain
Denitrification
Groundwater pollution
Structural equation model
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