Abstract
Background and aims
Rising ozone (O3) concentrations poses a great threat to crop growth and ecosystem carbon storage, but the underlying mechanism remains unclear. Identifying the impact of elevated O3 on soil microbial residues may advance our knowledge of microbial-mediated soil organic matter (SOM) turnover. In this paper, we aimed to investigate the effects of elevated O3 on the accumulation of amino sugars in the soil of the two wheat cultivars (Tritcium aestivum L.) with different ozone-tolerances.
Methods
Using the O3-Free Air Concentration Enrichment technique, we investigated the response of amino sugars to elevated O3 in a soil planted with two wheat cultivars of different ozone-tolerance [ozone-sensitive Yannong 19 (Y19) and ozone-tolerant Yangmai 16 (Y16)]. This study was conducted during the wheat growing season (jointing stage and ripening stage) of 2010 after exposure to elevated O3 for 3 years. Soil amino sugars were measured by gas chromatography technique.
Results
After exposure to elevated O3, the contents of total amino sugars decreased at the wheat jointing stage, and increased at the wheat ripening stage in the Y16 cultivar. In contrast, no significant effect of elevated O3 was found in the Y19 cultivar. The Glucosamine/Galactosamine and fungal carbon/bacterial carbon ratios decreased under elevated O3. The findings indicated that elevated O3 altered the microbial process of SOM turnover and bacteria contributed more to SOM cycling than fungi under elevated O3 conditions.
Conclusions
The effect of elevated O3 on the SOM turnover was wheat cultivar-specific. Thus, belowground processes of SOM turnover should be considered when selecting a tolerant wheat cultivar under elevated O3 regimes from a view of long-term ecosystem stability.
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Acknowledgments
The authors are grateful to Prof. Xinkai Zhu in Yangzhou University for supplying different wheat cultivars. We thank Professor Philip Brookes of Rothamsted Research for his great help in the revision of our manuscript. We also thank the anonymous reviewers for their insightful reviews of the manuscript. This research was supported by the Natural Science Foundation of China (Grant No. 41071161, 41130524, 31270487 and 41101242), the International S & T Cooperation Program of China (Grant No. 2009DFA31110), the Knowledge Innovation Program of Chinese Academy of Sciences (Grant No. KZCX2-EW-414), and the Global Environment Research Fund by the Ministry of the Environment, Japan (Grant No. C-062).
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Zhang, W., He, H., Li, Q. et al. Soil microbial residue dynamics after 3-year elevated O3 exposure are plant species-specific. Plant Soil 376, 139–149 (2014). https://doi.org/10.1007/s11104-013-1973-9
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DOI: https://doi.org/10.1007/s11104-013-1973-9