Summary
Nitrous oxide (N 2 O) emissions are highly variable due to the complex interaction of climatic and ecological factors. Here, we obtained in-situ annual N 2 O emission flux data from almost 180 peer-papers to evaluate the dominant drivers of N 2 O emissions from forests and unfertilized grasslands at a global scale. The average value of N 2 O emission fluxes from forest (1.389 kg Nha -1 yr -1 ) is almost twice as large as that from grassland (0.675 kg Nha -1 yr -1 ). Soil texture and climate are the primary drivers of global forest and grassland annual N 2 O emissions. However, the best predictors varied according to land use and region. Soil clay content was the best predictor for N 2 O emissions from forest soils, especially in moist or wet regions, while soil sand content predicted N 2 O
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