Nitrous oxide emissions from agricultural soils challenge climate sustainability in the US Corn Belt.

ABSTRACT: Agricultural landscapes are the largest source of anthropogenic nitrous oxide (N₂O) emissions, but their specific sources and magnitudes remain contested. In the US Corn Belt, a globally important N₂O source, in-field soil emissions were reportedly too small to account for N₂O measured in the regional atmosphere, and disproportionately high N₂O emissions from intermittent streams have been invoked to explain the discrepancy. We collected 3 y of high-frequency (4-h) measurements across a topographic gradient, including a very poorly drained (intermittently flooded) depression and adjacent upland soils. Mean annual N₂O emissions from this corn-soybean rotation (7.8 kg of N₂O-N ha^-1⋅y^-1) were similar to a

SUBMITTER: Lawrence NC 

PROVIDER: S-EPMC8694048 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature