Abstract
Aims
Plant mortality associated with the growing frequency and intensity of heatwaves and dry spells is increasingly occurring in various ecosystems worldwide. However, the impacts of extreme events on plant communities of ultramafic soils are still unknown. Here, we describe a first case of plant mortality on serpentine outcrops in Italy following a heat and drought event that occurred between autumn 2016 and summer 2017.
Methods
Mortality of perennial plants was assessed in thirty plots representing ten major serpentine areas along a SW-NE gradient, with the sparse vegetation of ultramafic soils. Statistical modelling was based on temperature and precipitation data and local site conditions.
Results
Responses of single species were largely different and not related to their taxonomic position, growth form or level of edaphic specialization for serpentine soils. Notably, obligate serpentine endemics were not less impacted than non-endemics. As expected, species mortality decreased with increasing chromosome number, suggesting higher tolerance and adaptive capacity in taxa of likely polyploid origin. Mortality increased with decreasing number of rainy days and duration of the heatwave and decreased with increasing distance from the Tyrrhenian coastline, reaching 60% in the southern and western areas with a Mediterranean climate. Local site conditions such as increasing soil depth and north-facing aspect significantly increased plant survivorship.
Conclusions
Our findings show that extreme drought and heat can have a previously unrealized impact on ultramafic plant communities in the short term. Further studies should examine the recovery capacity and resilience of serpentine plants, together with the long term effects.
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Acknowledgments
Authors wish to acknowledge Isabella Bettarini for valuable help during field work, Filippo Bussotti and Martina Pollastrini for useful discussion on plant mortality associated with climate extremes. We would also like to thank Ilaria Colzi for critical reading our manuscript and providing valuable comments. We finally wish to thank three anonymous reviewers whose comments/suggestions helped to improve the first version of our manuscript.
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Research funds to FS from the Italian Ministry for University and Research and University of Firenze are acknowledged.
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FS conceived the ideas and designed the methodology and collected the data. LL and FS analysed and interpreted the data. AC, FS and LL led the writing of the manuscript and contributed critically to the drafts and gave final approval for publication.
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Coppi, A., Lazzaro, L. & Selvi, F. Plant mortality on ultramafic soils after an extreme heat and drought event in the Mediterranean area. Plant Soil 471, 123–139 (2022). https://doi.org/10.1007/s11104-021-05179-2
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DOI: https://doi.org/10.1007/s11104-021-05179-2