Temporal Patterns of N2O Fluxes From a Rainfed Maize Field in Northeast China

Rainfed agriculture is one of the most common farming practices in world and vulnerable to global climate change. However, only limited studies have been conducted on rainfed agriculture, mainly using low-frequency manual techniques, which caused large uncertainties estimating annual N 2 O emissions. In this study, we used a fully automated system continuously measure soil emissions for two years (April 2017 March 2019) typical maize field Northeast China. The were 2.8 kg ha −1 year 1 2018) 1.8 2018 2019), accounting 1.9 1.2% nitrogen fertilizer applied, respectively. inter-annual variability was due different weather conditions encountered 2. A severe drought reduced plant uptake, leaving high mineral soil, following moderate rainfalls promoted amount seasonal pattern fluxes controlled by temperature nitrate concentration. Both moisture molar ratio NO/N indicate that NO derived from nitrification, resulting significant positive correlation between flux intra-rows (where applied). Moreover, observed during freeze–thaw periods negligible region agriculture. Our long-term high-resolution measurements suggest sampling LST 9:00 10:00 best empirical time intermittent measurements.