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  • 标题:Elevated Tropospheric Ozone Concentration Alters Soil CO<sub>2</sub> Emission: A Meta-Analysis
  • 本地全文:下载
  • 作者:Enzhu Hu ; Zhimin Ren ; Sheng Xu
  • 期刊名称:Sustainability
  • 印刷版ISSN:2071-1050
  • 出版年度:2021
  • 卷号:13
  • 期号:8
  • 页码:4571
  • DOI:10.3390/su13084571
  • 语种:English
  • 出版社:MDPI, Open Access Journal
  • 摘要:Elevated tropospheric ozone (O<sub>3</sub>) concentration may substantially influence the below-ground processes of terrestrial ecosystems. Nevertheless, a comprehensive and quantitative understanding of O<sub>3</sub> impacts on soil CO<sub>2</sub> emission remains elusive, making the future sources or sinks of soil C uncertain. In this study, 77 pairs of observations (i.e., elevated O<sub>3</sub> concentration treatment versus control) extracted from 16 peer-reviewed studies were synthesized using meta-analysis. The results depicted that soil CO<sub>2</sub> efflux was significantly reduced under short-term O<sub>3</sub> exposure (≤1 year, <i>p</i> < 0.05), while it was increased under extended duration (>1 year, <i>p</i> < 0.05). Particularly, soil CO<sub>2</sub> emission was stimulated in nonagricultural ecosystems, in the free-air CO<sub>2</sub> enrichment (FACE) experiment, and in the soils of lower pH. The effect sizes of soil CO<sub>2</sub> efflux were significantly positively correlated with experimental duration and were significantly negatively correlated with soil pH, respectively. The ozone effect on soil CO<sub>2</sub> efflux would be enhanced at warm temperatures and high precipitation. The duration of O<sub>3</sub> exposure was the fundamental factor in analyzing O<sub>3</sub> impacts on soil CO<sub>2</sub> emission.
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