UnivTrevesV1, Main, Exploration, bibRecord, 000A43

Xylem anatomy and hydraulic conductivity of three co-occurring desert phreatophytes

Identifieur interne : 000A43 ( Main/Exploration ); précédent : 000A42; suivant : 000A44

Xylem anatomy and hydraulic conductivity of three co-occurring desert phreatophytes

Auteurs : A. Rzepecki [Allemagne] ; F. Zeng [République populaire de Chine] ; F. M. Thomas [Allemagne]

Source :

Journal of arid environments [ 0140-1963 ] ; 2011.

RBID : Pascal:11-0126093

Descripteurs français

Pascal (Inist)
- Xylème, Anatomie, Conductivité hydraulique, Désert, Image numérique, Analyse image, Microscopie optique, Milieu aride, Tamarix ramosissima, Phréatophyte.
Wicri :
- topic : Anatomie, Désert.

English descriptors

KwdEn :
- Anatomy, Arid environment, Desert, Digital image, Hydraulic conductivity, Image analysis, Optical microscopy, Phreatophyte, Xylem.

Abstract

The tree species Populus euphratica, the shrub Tamarix ramosissima and the sub-shrub Alhagi sparsifolia are phreatophytes that grow along the southern fringe of the Taklamakan Desert (NW China). We hypothesised that in the shoot xylem of these species, the fraction of conduits with a large cross-sectional area and the hydraulic conductivity decrease in the sequence A. sparsifolia > T. ramosissima > P. euphratica according to the different ground water distances at the typical sites of the species' occurrence. The theoretical hydraulic conductivity related to the total cross-sectional xylem area (k_ttot) or to the cross-sectional area of the conduits (k_tcond) was computed using a modified Hagen-Poiseuille equation. The percentage of wide conduits and k_tcond were highest in A. sparsifolia, and smallest, in P. euphratica. With regard to ^k_ttot, the diffuse-porous to semi-ring-porous P. euphratica occupied an intermediate position due to an increased percentage of conducting area related to the total cross-sectional xylem area. This figure as well as k_ttot were lowest in the semi-ring-porous to ring-porous T. ramosissima. The k_ttot values corresponded to the leaf area-related hydraulic conductivity calculated from measurements in the field. Altogether, our results match the typical occurrence of the species with respect to the ground water depth.

Affiliations:

Links toward previous steps (curation, corpus...)

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to stream PascalFrancis, to step Curation: 000903
to stream PascalFrancis, to step Checkpoint: 000241
to stream Main, to step Merge: 000A74
to stream Main, to step Curation: 000A43

Le document en format XML

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<front><div type="abstract" xml:lang="en">The tree species Populus euphratica, the shrub Tamarix ramosissima and the sub-shrub Alhagi sparsifolia are phreatophytes that grow along the southern fringe of the Taklamakan Desert (NW China). We hypothesised that in the shoot xylem of these species, the fraction of conduits with a large cross-sectional area and the hydraulic conductivity decrease in the sequence A. sparsifolia > T. ramosissima > P. euphratica according to the different ground water distances at the typical sites of the species' occurrence. The theoretical hydraulic conductivity related to the total cross-sectional xylem area (k<sub>ttot</sub>
) or to the cross-sectional area of the conduits (k<sub>tcond</sub>
) was computed using a modified Hagen-Poiseuille equation. The percentage of wide conduits and k<sub>tcond</sub>
 were highest in A. sparsifolia, and smallest, in P. euphratica. With regard to <sup>k</sup>
<sub>ttot</sub>
, the diffuse-porous to semi-ring-porous P. euphratica occupied an intermediate position due to an increased percentage of conducting area related to the total cross-sectional xylem area. This figure as well as k<sub>ttot</sub>
 were lowest in the semi-ring-porous to ring-porous T. ramosissima. The k<sub>ttot</sub>
 values corresponded to the leaf area-related hydraulic conductivity calculated from measurements in the field. Altogether, our results match the typical occurrence of the species with respect to the ground water depth.</div>
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Xylem anatomy and hydraulic conductivity of three co-occurring desert phreatophytes

Xylem anatomy and hydraulic conductivity of three co-occurring desert phreatophytes

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri