Elevated Tropospheric Ozone Concentration Alters Soil CO2 Emission: A Meta-Analysis

Elevated tropospheric ozone (O3) concentration may substantially influence the below-ground processes of terrestrial ecosystems. Nevertheless, a comprehensive and quantitative understanding O3 impacts on soil CO2 emission remains elusive, making future sources or sinks C uncertain. In this study, 77 pairs observations (i.e., elevated treatment versus control) extracted from 16 peer-reviewed studies were synthesized using meta-analysis. The results depicted that efflux was significantly reduced under short-term exposure (≤1 year, p < 0.05), while it increased extended duration (>1 0.05). Particularly, stimulated in nonagricultural ecosystems, free-air enrichment (FACE) experiment, soils lower pH. effect sizes positively correlated with experimental negatively pH, respectively. would be enhanced at warm temperatures high precipitation. fundamental factor analyzing emission.