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Title of Journal: Plant Soil

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Abbravation: Plant and Soil

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Springer Netherlands

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DOI

10.1007/bf00330757

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ISSN

1573-5036

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Precipitation variability does not affect soil res

Authors: Marjan Jongen Xavier Lecomte Stephan Unger David Fangueiro João Santos Pereira
Publish Date: 2013/05/05
Volume: 372, Issue: 1-2, Pages: 235-251
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Abstract

Future climate scenarios for the Mediterranean imply increasing precipitation variability This study presents a largescale water manipulation experiment simulating changes in precipitation variability aiming at a better understanding of the effects of rainfall patterns on soil C and N cycling and understorey productivity in a Mediterranean oak woodlandThe temporal patterns of soil respiration R s and soil inorganic N were not affected by treatment However water infiltration and N leaching increased with large infrequent watering events R s and soil NH4 +N correlated with soil temperature with soil NO3 −N being influenced by leachingThe lack of significant treatment effects on either R s or soil inorganic N can be explained by 1 minor differences in plant productivity between the treatments suggesting equal plant N demand and 2 the absence of moisture dependence of R s and soil NH4 +N Increased N leaching with large infrequent precipitation events may have longerterm consequences for ecosystem functioning Our results contribute to an improved understanding of possible climate change effects on key ecosystem processes in Mediterranean ecosystemsThe authors acknowledge the financial support of FCT Fundação para a Ciência e Tecnologia through the project PTDC/CLI/64480/2006 and through postdoctoral fellowships to Marjan Jongen SFRH/BPD/79662/2011 and David Fangueiro SFRH/BPD/84229/2012 The authors wish to thank António Gonçalves Ferreira for providing the field site at Machoqueira do Grou the staff of Machoqueira do Grou especially Mr Pirra for continuous support to the work Filipe Costa e Silva Joaquim Mendes Francesco Minunno and Alexandra Correia for assisting with the construction of the rainout shelters Prof Fernando Monteiro for the measurements of wilting point Marta PintóMarijuan and Elsa Breia for valuable support in the laboratory and Peter Fay for suggestions on the manuscript

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