Short-term responses of greenhouse gas emissions and ecosystem carbon fluxes to elevated ozone and N fertilization in a temperate grassland

Wang, Jinyang; Hayes, Felicity ORCID: https://orcid.org/0000-0002-1037-5725; Chadwick, David R.; Hill, Paul W.; Mills, Gina; Jones, Davey L.. 2019 Short-term responses of greenhouse gas emissions and ecosystem carbon fluxes to elevated ozone and N fertilization in a temperate grassland. Atmospheric Environment, 211. 204-213. https://doi.org/10.1016/j.atmosenv.2019.05.027

Before downloading, please read NORA policies.

Preview

Text N523603PP.pdf - Accepted Version Download (595kB) | Preview

Abstract/Summary

Growing evidence suggests that tropospheric ozone has widespread effects on vegetation, which can contribute to alter ecosystem carbon (C) dynamics and belowground processes. In this study, we used intact soil mesocosms from a semi-improved grassland and investigated the effects of elevated ozone, alone and in combination with nitrogen (N) fertilization on soil-borne greenhouse gas emissions and ecosystem C fluxes. Ozone exposure under fully open-air field conditions was occurred during the growing season. Across a one-year period, soil methane (CH4) and nitrous oxide (N2O) emissions did not differ between treatments, but elevated ozone significantly depressed soil CH4 uptake by 14% during the growing season irrespective of N fertilization. Elevated ozone resulted in a 15% reduction of net ecosystem exchange of carbon dioxide, while N fertilization significantly increased ecosystem respiration during the growing season. Aboveground biomass was unaffected by elevated ozone during the growing season but significantly decreased by 17% during the non-growing season. At the end of the experiment, soil mineral N content, net N mineralization and extracellular enzyme activities (i.e., cellobiohydrolase and leucine aminopeptidase) were higher under elevated ozone than ambient ozone. The short-term effect of single application of N fertilizer was primarily responsible for the lack of the interaction between elevated ozone and N fertilization. Therefore, results of our short-term study suggest that ozone exposure may have negative impacts on soil CH4 uptake and C sequestration and contribute to accelerated rates of soil N-cycling.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1016/j.atmosenv.2019.05.027
UKCEH and CEH Sections/Science Areas:	Soils and Land Use (Science Area 2017-) UKCEH Fellows
ISSN:	1352-2310
Additional Keywords:	air pollutant, fertilizer management, ground level O3, plant-soil feedbacks, soil nutrient cycling
NORA Subject Terms:	Agriculture and Soil Science Atmospheric Sciences
Date made live:	03 Jun 2019 10:03 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/523603

Actions (login required)

View Item

Document Downloads

More statistics for this item...