Hydraulic lift: soil processes and transpiration in the Mediterranean leguminous shrub Retama sphaerocarpa (L.) Boiss

450 7 1691 2 4896 document 1691 Prieto et al 2010 Plant Soil.PDF application/pdf 30a4c2b3478b9914e66e72b2a1ee7938 MD5 339208 2014-01-23 05:06:53 http://eprints.iliauni.edu.ge/450/1/Prieto%20et%20al%202010%20Plant%20Soil.PDF 450 1 1 application/pdf text en public

Prieto et al 2010 Plant Soil.PDF

published 1702 2 4913 document 1702 lightbox.jpg image/png fc66679b93a4bf02786b15fc83669866 MD5 42048 2014-01-23 05:17:15 http://eprints.iliauni.edu.ge/450/2/lightbox.jpg 450 2 2 image/png other Thumbnails conversion from text to thumbnail_lightbox ge public

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http://eprints.org/relation/isVersionOf http://eprints.iliauni.edu.ge/id/document/1691 http://eprints.org/relation/isVolatileVersionOf http://eprints.iliauni.edu.ge/id/document/1691 http://eprints.org/relation/issmallThumbnailVersionOf http://eprints.iliauni.edu.ge/id/document/1691 archive 137 disk0/00/00/04/50 2014-01-23 05:47:38 2014-01-23 05:47:38 2014-01-23 05:47:38 article no_search Prieto Iván iprieto@eeza.csic.es Kikvidze Zaal zaal.kikvidze@iliauni.edu.ge Pugnaire Francisco fip@eeza.csic.es Hydraulic lift: soil processes and transpiration in the Mediterranean leguminous shrub Retama sphaerocarpa (L.) Boiss pub QEC ins18 public Hydraulic lift (HL) is the process by which plants can passively transfer water from deep, moist soil layers to shallow, dry soil layers. Although it has attracted recent research interest, a mechanistic understanding and its implications for ecosystem functioning are still lacking. Here we describe HL seasonal patterns in a semi-arid shrub species and its influence on plant water dynamics. We measured soil water availability and plant water status over the course of 1 year. Soil water potential in the rhizosphere of Retama sphaerocarpa (L.) Boiss (Fabaceae) individuals and in adjacent land was recorded using soil psychrometers. Sap flow was recorded simultaneously using the stem heat balance method (SHBM). Our results show a seasonal HL trend linked to mean seasonal soil water potential with greatest HL amplitudes at moderately low water potentials (ca −4 MPa). HL amplitude was negatively affected by nocturnal transpiration, and HL patterns were recorded in all seasons and at water potentials ranging from −0.1 MPa to −8.5 MPa which is consistent with R. sphaerocarpa deep rooting habit and its steady access to ground water. Plant and Soil TRUE