Abstract
Aims
In subalpine grasslands, litter decomposition controls soil nutrient availability and is highly sensitive to increasing intensity and frequency of extreme climate events, potentially impacting grasslands diversity and functioning. Here, we assessed the effects of early snowmelt and summer drought on decomposition, and how these were modulated by agricultural management.
Methods
In a common garden, conservative and exploitative assembled communities were submitted for two years to combined snow removal and drought, and to cutting and fertilization. We measured decomposition rates of standard and native leaf material from each plant communities on their respective soils.
Results
We observed relatively weak climatic stress effects on decomposition rates. Management increased decomposition rates and remaining litter N contents through leaf quality improvement rather than changed soil biotic activity. Climate events impacted the decomposer community and limited litter N immobilization in conservative communities. Less recalcitrant litter of exploitative species facilitated decomposition and counterbalanced the negative effects of climate stress.
Conclusion
Our results suggest that drought and earlier snowmelt could decrease N availability in subalpine grasslands due to reduced litter biomass and decomposition. In the long-term climate change may shift subalpine grasslands towards more conservative plant composition and lower soil fertility.
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Acknowledgments
We are grateful to Adeline Bierry, Jean-Marc Bonneville, Coline Byczek, Amélie Cantarel, Emilie Crouzat, Franck Delbart, Caroline Devaux, Marine Gabillet, Rachel Gerardin, Ludovic Gielly, Pierre Gos, Karl Grigulis, Fanny Guillot, Nadine Guillaumaud, Nicolas Legay, Remy Lasseur, Maud Mouchet, Franck Poly, Thomas Pommier and Laure Zupan for their help with the global change experiment, Cindy Arnoldi and Jonathan Corjon for their help with chemical analyses. This study was supported by the ERA-Net BiodivERsA project REGARDS (ANR-12-EBID-004-01). Lionel Bernard was funded by the ECO-SERVE project during the writing up of this manuscript through the 2013–2014 BiodivERsA/FACCE-JPI joint call for research proposals, with the national funders ANR, NWO, FCT, MINECO, FORMAS, and SNSF. This research was conducted at ‘Jardin du Lautaret’(UMS 3370 Univ. Grenoble Alpes – CNRS), a member of AnaEE-France (ANR-11-INBS-0001AnaEE-Services), on the LTSER platform ‘Zone Atelier Alpes’, a member of the ILTER-Europe network.
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Bernard, L., Foulquier, A., Gallet, C. et al. Effects of snow pack reduction and drought on litter decomposition in subalpine grassland communities. Plant Soil 435, 225–238 (2019). https://doi.org/10.1007/s11104-018-3891-3
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DOI: https://doi.org/10.1007/s11104-018-3891-3