Opposite response of N 2 O emissions in different seasons to warming and precipitation addition on a temperate steppe

• Published in: Ecosphere (Washington, D.C) D.C), 2023-06, Vol.14 (6)
• Main Authors: Wan, Zhiqiang, Gu, Rui, Ganjurjav, Hasbagan, Hu, Guozheng, Gao, Qingzhu, Chen, Xuemeng, Gu, Xiling, Chun, Xi, Zhou, Haijun
• Format: Article
• Language: English
• ISSN: 2150-8925; 2150-8925
• DOI: 10.1002/ecs2.4598

Climate change is an important issue that affects both global warming and precipitation, and the main cause is increased N 2 O emissions. Temperature and moisture are key factors in grassland ecosystem's response to climate change, and they can affect N 2 O fluxes. To clarify the impacts of warming and precipitation changes on N 2 O fluxes, an experiment was conducted in a semiarid steppe in Inner Mongolia, China over a nine‐year period (2011–2019). Plant productivity and soil nutrient dynamics were examined concurrently from 2017 to 2019, and N 2 O fluxes were monitored in response to different treatment conditions: control (C), warming (W), precipitation addition (P), and warming and precipitation addition (WP). The results showed that N 2 O emissions in the growing season were higher than those in the nongrowing season. Warming and precipitation addition had no significant effect on N 2 O fluxes compared with ambient conditions. Compared with P treatment, warming increased N 2 O flux in nongrowing season and decreased it in growing season. N 2 O flux was positively correlated with soil temperature and moisture ( p