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Poorly draineddepressions can behotspots of nutrientleaching fromagricultural soils Steven J. HallCarlos G. TenesacaNathaniel C. Lawrence2023 год

Poorly drained depressions can be hotspots of nutrient leaching from agricultural soils
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Аннотация: Abstract Much of the US Corn Belt has been drained with subsurface tile to improve crop production, yet poorly drained depressions often still flood intermittently, suppressing crop growth. Impacts of depressions on field‐scale nutrient leaching are unclear. Poor drainage might promote denitrification and physicochemical retention of phosphorus (P), but ample availability of water and nutrients might exacerbate nutrient leaching from cropped depressions. We monitored nitrate, ammonium, and reactive P leaching across multiple depression‐to‐upland transects in north‐central Iowa, using resin lysimeters buried and retrieved on an annual basis. Crops included conventional corn/soybean ( Zea mays / Glycine max ) rotations measured at fields with and without a winter rye ( Secale cereale ) cover crop, as well as juvenile miscanthus ( Miscanthus × giganteus ), a perennial grass. Leaching of nitrogen (N) and P was greater in depressions than in uplands for most transects and years. The median difference in nutrient leaching between paired depressions and uplands was 56 kg N ha −1 year −1 for nitrate ( p = 0.0008), 0.6 kg N ha −1 year −1 for ammonium ( p = 0.03), and 2.4 kg P ha −1 year −1 for reactive P ( p = 0.006). Transects managed with a cover crop or miscanthus tended to have a smaller median difference in nitrate (but not ammonium or P) leaching between depressions and uplands. Cropped depressions may be disproportionate sources of N and P to downstream waters despite their generally poor drainage characteristics, and targeted management with cover crops or perennials might partially mitigate these impacts for N, but not necessarily for P.
Год издания: 2023
Авторы: Steven J. Hall, Carlos G. Tenesaca, Nathaniel C. Lawrence, David I. S. Green, Matthew J. Helmers, William G. Crumpton, Emily A. Heaton, Andy VanLoocke
Издательство: Wiley
Источник: Journal of Environmental Quality
Ключевые слова: Soil Carbon and Nitrogen Dynamics, Soil and Water Nutrient Dynamics, Soil erosion and sediment transport
Другие ссылки: Journal of Environmental Quality (PDF)
Journal of Environmental Quality (HTML)
PubMed (HTML)