Abstract
Few studies have investigated whether responses to nutrient supply of mixed plant communities change under combined elevated CO2 and climate warming. In this study we analyzed the response of constructed temperate grassland communities to five levels of nitrogen (N) supply, ranging from 0 to 150 kg N ha−1, under two climate scenarios. Biomass of the plant communities responded positively to N supply in the current climate, but was insensitive to N supply in the future climate. This altered response was not the result of a changing response from a single species, but all species seemed to contribute to it. The weaker response in the future climate was caused by changes in N uptake rather than by changes in nitrogen use efficiency, as community N stocks showed the same response pattern as community biomass. Climate change apparently modified the relation between fertilizer N addition and plant available N.
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Abbreviations
- SOM:
-
Soil organic matter
- Tair :
-
Air temperature
- PAR:
-
Photosynthetically active radiation
- SD:
-
Standard deviation
- vpd:
-
Vapour pressure deficit
- ET:
-
Evapotranspiration
- SWC:
-
Soil water content
- ANCOVA:
-
Analysis of covariance
- SEN:
-
Soil extractable nitrogen
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Acknowledgements
This research was funded by the University of Antwerp as concerted research project “Changes in the stress sensitivity of plants and ecosystems under climate change conditions” (GOA-BOF-UA-2007). J. Van den Berge is a Research Assistant of the Fund for Scientific Research-Flanders (F.W.O-Vlaanderen). K. Naudts holds a grant from the Institute for the Promotion of Innovation by Science and Technology in Flanders (I.W.T.). We thank B. Gielen for her help during the set-up of the experiment, N. Calluy, K. Crous and F. Kockelbergh for technical assistance, M. Büscher, H. De Boeck, W. Dieleman, S. Y. Dillen, M. Op de Beeck, M. Roland, H. Verbeeck, M. Verlinden and S. Vicca for field assistance and S. Van Dongen for statistical advice.
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Van den Berge, J., Naudts, K., Zavalloni, C. et al. Altered response to nitrogen supply of mixed grassland communities in a future climate: a controlled environment microcosm study. Plant Soil 345, 375–385 (2011). https://doi.org/10.1007/s11104-011-0789-8
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DOI: https://doi.org/10.1007/s11104-011-0789-8