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The role of nutrients for improving seedling quality in drylands

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Abstract

Forest plantations have been extensively used to combat desertification. In drylands, harsh climate conditions and unfertile soils often preclude seedling establishment. The improvement in seedling quality by manipulating nutrient availability could contribute to increase planting success. However, morpho-functional traits defining optimum seedling quality in drylands, and the fertilization schemes to achieve them, are still under discussion. Several studies suggest that well fertilized seedlings may perform better than nutrient limited seedlings in these environments. However, recent works have shown opposite results. In this review, we discuss the concept of seedling quality in drylands based on an evaluation of the effects of nutrient manipulation on seedling morpho-functional traits and field performance. According to existing data, we hypothesize that nutrient-limited small seedlings may be better adapted to arid environments and unfavorable microsites, where access to water is uncertain and a conservative water use strategy may be advantageous. In contrast, in dry sub-humid areas, areas with deep soils, protected from excess radiation, and areas where irrigation is feasible, well-fertilized big seedlings with high root growth potential may have more chances of success. We discuss this theory in the context of the multiple objectives of dryland restoration and the environmental constrains posed by these areas, and identify knowledge gaps that should be targeted to test our hypothesis.

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Acknowledgments

This paper summarizes research funded by the European Commission (FUME-GA243888, CREOAK-QLRT-2001-01594), the Spanish Ministries of Science and Innovation (GRACCIE-CSD2007-00067, CONSOLIDER-INGENIO 2010 Program, LORAIN-AGL2008-05532-C02-02, SURVIVE-CGL-2011-30531-CO2-02), Economy and Competitivity (UNCROACH-CGL2011-30581-C02-01) and Environment (RECUVES—077/RN08/04.1; ESTRES, 063/SGTB/2007/7.1), and by the Regional Government of Valencia (FEEDBACKS-PROMETEO/2009/006). We thank the Forest Service in Alicante (Conselleria de Infraestructuras, Territorio y Medio Ambiente, Regional Government of Valencia) for their enduring assistance. Fundación CEAM is supported by Generalitat Valenciana.

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  1. Department of Ecology (Joint Research Unit University of Alicante-CEAM), Multidisciplinary Institute for Environmental Studies, University of Alicante, PO Box 99, 03080, Alicante, Spain

    Jordi Cortina & Roman Trubat

  2. Fundación Centro de Estudios Ambientales del Mediterráneo (CEAM), Joint Research Unit University of Alicante-CEAM, PO Box 99, 03080, Alicante, Spain

    Alberto Vilagrosa

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  1. Jordi Cortina
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Correspondence to Jordi Cortina.

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Cortina, J., Vilagrosa, A. & Trubat, R. The role of nutrients for improving seedling quality in drylands. New Forests 44, 719–732 (2013). https://doi.org/10.1007/s11056-013-9379-3

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