Elevated Tropospheric Ozone Concentration Alters Soil CO 2 Emission: A Meta-Analysis

Enzhu Hu, Zhimin Ren, Sheng Xu and Weiwei Zhang
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Enzhu Hu: Institute of Resources and Environmental Sciences, School of Metallurgy, Northeastern University, Shenyang 110819, China
Zhimin Ren: Institute of Resources and Environmental Sciences, School of Metallurgy, Northeastern University, Shenyang 110819, China
Sheng Xu: Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
Weiwei Zhang: Ministry of Education Key Lab for Eco-Restoration of Contaminated Environment, Shenyang University, Shenyang 110044, China

Sustainability, 2021, vol. 13, issue 8, 1-10

Abstract: Elevated tropospheric ozone (O 3 ) concentration may substantially influence the below-ground processes of terrestrial ecosystems. Nevertheless, a comprehensive and quantitative understanding of O 3 impacts on soil CO 2 emission remains elusive, making the future sources or sinks of soil C uncertain. In this study, 77 pairs of observations (i.e., elevated O 3 concentration treatment versus control) extracted from 16 peer-reviewed studies were synthesized using meta-analysis. The results depicted that soil CO 2 efflux was significantly reduced under short-term O 3 exposure (≤1 year, p < 0.05), while it was increased under extended duration (>1 year, p < 0.05). Particularly, soil CO 2 emission was stimulated in nonagricultural ecosystems, in the free-air CO 2 enrichment (FACE) experiment, and in the soils of lower pH. The effect sizes of soil CO 2 efflux were significantly positively correlated with experimental duration and were significantly negatively correlated with soil pH, respectively. The ozone effect on soil CO 2 efflux would be enhanced at warm temperatures and high precipitation. The duration of O 3 exposure was the fundamental factor in analyzing O 3 impacts on soil CO 2 emission.

Keywords: elevated O 3 concentration; meta-analysis; soil CO 2 emission; climate change (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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