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Drought and warming induced changes in P and K concentration and accumulation in plant biomass and soil in a Mediterranean shrubland

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Abstract

A field experiment involving drought and warming manipulation was conducted over a 6-year period in a Mediterranean shrubland to simulate the climate conditions projected by IPCC models for the coming decades (20% decreased soil moisture and 1°C warming). We investigated P and K concentration and accumulation in the leaves and stems of the dominant species, and in soil. Drought decreased P concentration in Globularia alypum leaves (21%) and in Erica multiflora stems (30%) and decreased K concentration in the leaves of both species (20% and 29%, respectively). The general decrease of P and K concentration in drought plots was due to the reduction of soil water content, soil and root phosphatase activity and photosynthetic capacity that decreased plant uptake capacity. Warming increased P concentration in Erica multiflora leaves (42%), but decreased it in the stems and leaf litter of Erica multiflora and the leaf litter (33%) of Globularia alypum, thereby demonstrating that warming improved the P retranslocation and allocation from stem to leaves. These results correlate with the increase in photosynthetic capacity and growth of these two dominant shrub species in warming plots. Drought and warming had no significant effects on biomass P accumulation in the period 1999–2005, but drought increased K accumulation in aboveground biomass (10 kg ha−1) in Globularia alypum due to the increase in K concentration in stems. The stoichiometric changes produced by the different responses of the nutrients led to changes in the P/K concentration ratio in Erica multiflora leaves, stems and litter, and in Globularia alypum stems and litter. This may have implications for the nutritional value of these plant species and plant–herbivore relationships. The effects of climate change on P and K concentrations and contents in Mediterranean ecosystems will differ depending on whether the main component of change is drought or warming.

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Acknowledgements

This research was supported by the Spanish Government projects CGL2004-01402/BOS and CGL2006-04025/BOS, the Catalan Government grant SGR 2005-00312, the European projects ALARM (Contract 506675) and FP6 NEU NITROEUROPE (GOCE017841), and a Fundación BBVA 2004 grant.

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  1. Ecophysiology and Global Change Unit CSIC-CEAB-CREAF, CREAF (Center for Ecological research and Forestry Applications), Universitat Autònoma de Barcelona, 08193, Bellaterra, Spain

    J. Sardans, J. Peñuelas, P. Prieto & M. Estiarte

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  1. J. Sardans
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  2. J. Peñuelas
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  3. P. Prieto
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  4. M. Estiarte
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Correspondence to J. Sardans.

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Sardans, J., Peñuelas, J., Prieto, P. et al. Drought and warming induced changes in P and K concentration and accumulation in plant biomass and soil in a Mediterranean shrubland. Plant Soil 306, 261–271 (2008). https://doi.org/10.1007/s11104-008-9583-7

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  • DOI: https://doi.org/10.1007/s11104-008-9583-7

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