Warming-Induced Stimulation of Soil N2O Emissions Counteracted by Elevated CO2 from Nine-Year Agroecosystem Temperature and Free Air Carbon Dioxide Enrichment

• DOI: 10.1021/acs.est.3c10775
• Publication Date: 2024-03-28T15:48:21Z
• Authors: Xiaoshun Tu; Jing Wang; Xiaoyu Liu; Yu Liu; Yinghua Zhang; Yves Uwiragiye; Ahmed S. Elrys; Jinbo Zhang; Zucong Cai; Yi Cheng; Christoph Müller
• Keywords: Nitrous oxide; Agroecosystem; Soil carbon; Nitrogen Cycle

Globally, agricultural soils account for approximately one-third of anthropogenic emissions the potent greenhouse gas and stratospheric ozone-depleting substance nitrous oxide (N2O). Emissions N2O from are affected by a number global change factors, such as elevated air temperatures atmospheric carbon dioxide (CO2). Yet, mechanistic understanding how these climatic factors affect in remains largely unresolved. Here, we investigate soil emission pathway using 15N tracing approach nine-year field experiment combined temperature free enrichment (T-FACE). We show that effect CO2 completely counteracts warming-induced stimulation both nitrification- denitrification-derived emissions. The induced decrease pH labile organic nitrogen (N) masked N warming. Unexpectedly, warming had little on abundances nitrifying denitrifying genes. Overall, our study confirms importance multifactorial experiments to understand pathways under climate change. This better is prerequisite more accurate models development effective options combat