The global distribution of soil nitrification and the fraction of associated N2O emissionby using stochastic gradient boosting models

Nitrification is one of pathways of N2O production in soils. Using stochastic gradient boosting models based on a global database, we quantified the global spatial distributions of gross nitrification rate and the fraction of associated N2O emission.

We found that the large variations of gross nitrification rate (0.008-9.1 kg N ha-1 d -1 ) and the fraction of associated N2O emission (0.005-1.24%) are driven by long-term environmental and edaphic factors (soil pH, C/N ratio and mean annual temperature; soil pH, total nitrogen, clay content and mean annual precipitation, respectively.) Appropriate mitigation strategies should be implemented to regulate nitrification and subsequent nitrogen loss.