Effects of controlled-release fertilizer on N2O emissions in wheat under elevated CO2 concentration and temperature

• Published in: Plant and soil Vol. 488; no. 1-2; pp. 343 - 361
• Main Authors: Liu, Qi, Liu, Yajing, Hao, Xingyu, Song, Chunxu, Zong, Yuzheng, Zhang, Dongsheng, Shi, Xinrui, Li, Ping
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.07.2023; Springer Nature B.V
• Subjects: Abundance; Agricultural ecosystems; Agriculture; Ammonia; Ammonia-oxidizing bacteria; Biomedical and Life Sciences; Carbon dioxide; Carbon dioxide concentration; Climate change; Controlled release; Crop yield; Ecology; Elongation; Emission analysis; Emissions; Enzymatic activity; Farm buildings; Fertilizers; Global warming; Greenhouse effect; Greenhouse gases; Growing season; High temperature; Life Sciences; Mineralization; Mitigation; Nitrite reductase; Nitrogen; Nitrous oxide; Oxidation; Plant Physiology; Plant Sciences; Reductases; Research Article; Soil Science & Conservation; Soils; Urea; Wheat; Controlled-release fertilizers; Elevated temperature; concentrations; Elevated CO; Nitrifiers and denitrifiers; O emissions; N
• ISSN: 0032-079X; 1573-5036
• DOI: 10.1007/s11104-023-05972-1

Aims N 2 O emitted by agricultural ecosystems has a great impact on global warming and climate change. The use of controlled-release fertilizers (CRF) can decrease greenhouse gas emissions. However, the general patterns and variability of nitrogen functional genes in response to CRF associated with N 2 O emission have not been synthesized under climate change. Methods We investigated the effects of CRF, elevated CO 2 concentration (EC), elevated temperature (ET), and their combination on N 2 O emission, enzyme activities and gene abundances. Results We found that the cumulative N 2 O emissions was in the range of 0.39–1.65 kg·ha −1 in the wheat-growing season, accounting for 0.54%–2.29% of the total nitrogen input. N 2 O emissions were considerably positively correlated with ammonia-oxidizing bacteria (AOB) at elongation stage. CRF inputs significantly decreased N 2 O emissions by 29 − 66% compared with urea due to decreased AOB abundance and inhibited nitrite reductase activities at elongation stage. EC significantly decreased N 2 O emissions by 30 − 50% likely resulting from the inhibition in nitrifying and denitrifying community compared with ambient CO 2 concentration. ET significantly increased N 2 O emissions by increasing N mineralization in wheat soil under CRF due to higher NH 4 + -N and NO 3 − -N concentration in wheat soil at elongation stage. In addition, ECET had antagonistic effect on N 2 O emissions. CRF had no significant effect on wheat yield under climate change scenarios. Conclusions CRF decreased the cumulative N 2 O emissions under climate change scenarios. This is critical for understanding the responses of N 2 O emissions from wheat soil under CRF to future CO 2 enrichment and warming for the establishment of mitigation and adaptation policies.