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Tree growth and water-use in hyper-arid Acacia occurs during the hottest and driest season
Year:
2018
Source of publication :
Oecologia
Authors :
כהן, שבתאי
;
.
Volume :
Co-Authors:

Gidon Winters, The Dead Sea-Arava Science Center, Tamar Regional Council, Neve Zohar, Israel. • Dennis Otieno, Department of Biological SciencesJaramogi Oginga Odinga University of Science and TechnologyBondoKenya. Christina Bogner, Ecological Modelling, BayCEERUniversity of BayreuthBayreuthGermany. Tamir Klein, Department of Plant and Environmental SciencesWeizmann Institute of ScienceRehovotIsrael

Facilitators :
From page:
1
To page:
11
(
Total pages:
11
)
Abstract:

 strategies. Although Acacia (Vachellia) species dominate many of the globe’s deserts, little is known about their growth dynamics and water-use in situ. Stem diameter dynamics, leaf phenology, and sap flow were monitored during 3 consecutive years in five Acacia raddiana trees and five Acacia tortilis trees in the Arid Arava Valley, southern Israel (annual precipitation 20–70 mm, restricted to October–May). We hypothesized that stem growth and other tree activities are synchronized with, and limited to single rainfall or flashflood events. Unexpectedly, cambial growth of both Acacia species was arrested during the wet season, and occurred during most of the dry season, coinciding with maximum daily temperatures as high as 45 °C and vapor pressure deficit of up to 9 kPa. Summer growth was correlated with peak sap flow in June, with almost year-round activity and foliage cover. To the best of our knowledge, these are the harshest drought conditions ever documented permitting cambial growth. These findings point to the possibility that summer cambial growth in Acacia under hyper-arid conditions relies on concurrent leaf gas exchange, which is in turn permitted by access to deep soil water. Soil water can support low-density tree populations despite heat and drought, as long as recharge is kept above a minimum threshold.

Note:
Related Files :
Acacia raddiana
Acacia tortilis
Arava (Region)
Desert Global warming
Leaf phenology
sap flow
Tree drought resistance Arava
עוד תגיות
תוכן קשור
More details
DOI :
Article number:
0
Affiliations:
Database:
גוגל סקולר
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
36731
Last updated date:
02/03/2022 17:27
Creation date:
22/08/2018 12:01
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Scientific Publication
Tree growth and water-use in hyper-arid Acacia occurs during the hottest and driest season

Gidon Winters, The Dead Sea-Arava Science Center, Tamar Regional Council, Neve Zohar, Israel. • Dennis Otieno, Department of Biological SciencesJaramogi Oginga Odinga University of Science and TechnologyBondoKenya. Christina Bogner, Ecological Modelling, BayCEERUniversity of BayreuthBayreuthGermany. Tamir Klein, Department of Plant and Environmental SciencesWeizmann Institute of ScienceRehovotIsrael

Tree growth and water-use in hyper-arid Acacia occurs during the hottest and driest season .

 strategies. Although Acacia (Vachellia) species dominate many of the globe’s deserts, little is known about their growth dynamics and water-use in situ. Stem diameter dynamics, leaf phenology, and sap flow were monitored during 3 consecutive years in five Acacia raddiana trees and five Acacia tortilis trees in the Arid Arava Valley, southern Israel (annual precipitation 20–70 mm, restricted to October–May). We hypothesized that stem growth and other tree activities are synchronized with, and limited to single rainfall or flashflood events. Unexpectedly, cambial growth of both Acacia species was arrested during the wet season, and occurred during most of the dry season, coinciding with maximum daily temperatures as high as 45 °C and vapor pressure deficit of up to 9 kPa. Summer growth was correlated with peak sap flow in June, with almost year-round activity and foliage cover. To the best of our knowledge, these are the harshest drought conditions ever documented permitting cambial growth. These findings point to the possibility that summer cambial growth in Acacia under hyper-arid conditions relies on concurrent leaf gas exchange, which is in turn permitted by access to deep soil water. Soil water can support low-density tree populations despite heat and drought, as long as recharge is kept above a minimum threshold.

Scientific Publication
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