Abstract
In central-western Argentina, there is a pronounced water deficit gradient, from semiarid climate conditions with 500-mm rainfall/year to arid climate conditions with 80-mm rainfall/year. This climatic transition, governed by the rainfall gradient, occurs between the Arid Chaco and Monte phytogeographic regions and is evidenced by differences in vegetation type, structure, dynamics and tree growth. In turn, the availability of soil moisture, particularly access to the water table, modifies water use strategies by trees along this gradient. We analyzed how water availability, expressed as differences in accessibility to the water table, influences Prosopis flexuosa tree rings along a precipitation gradient. In this manner, we try to interpret the growth of species according to the use of differential water sources. P. flexuosa showed highly varying growth reactions (tree-ring width and hydraulic anatomic parameters) with climate, depending on the ecology of the site. Along the Arid Chaco-Monte gradient, the growth of P. flexuosa is more dependent on variations in rainfall in those areas where water depth is greater than root spread. The climate signal was hidden in those regions where the water table is accessible to the root system.
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Acknowledgments
This study was funded by the Argentinean National Agency of Scientific and Technological Promotion (ANPCyT), Project PICT 2002-00200. We are grateful to Mr Carranza and Mrs Ledesma for providing most of the samples of the El Álamo site, to Mr Azaguate, Marquez and Patriti for allowing us to collect samples from their properties. We thank Juan Alvarez, Enrique Barrio, Hugo Debandi, José Hernández and Gualberto Zalazar for their field assistance, Silvia Delgado for the programming of PC-Image, Rafael Bottero for the location map, Nelly Horak for the English version and M. Eugenia Ferrero for the English assistance. We appreciate the many helpful suggestions and insightful comments from the reviewers.
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Giantomasi, M.A., Roig-Juñent, F.A. & Villagra, P.E. Use of differential water sources by Prosopis flexuosa DC: a dendroecological study. Plant Ecol 214, 11–27 (2013). https://doi.org/10.1007/s11258-012-0141-2
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DOI: https://doi.org/10.1007/s11258-012-0141-2