Reverse phenology and dry-season water uptake by Faidherbia albida (Del.) A. Chev. in an agroforestry parkland of Sudanese West Africa
#Faidherbia albida# (Acacia) is a multipurpose tree widely distributed in semiarid Africa, notably in agroforestry parklands. It is in leaf during the dry season and defoliated during the rainy season, displaying therefore a peculiar reverse phenology. The related water-use strategy, including leaf water potential, sapflow, hydraulic conductance and depth of uptake, were monitored on adult trees in a Sudanese west-African parkland. Despite a severe drought in the superficial soil layers, the predawn leaf water potential of #F. albida# dropped only to #ca.# - 0.5 MPa during the end of the dry season, indicating only a moderate water stress. Radial trunk growth ceased before the end of the dry season and could have been affected by the moderate drought stress. However, leafiness remained constant during the dry season. Leaf shedding occurred after the first rains and was probably independent of drought. #F. albida# displayed large transpiration rates under favourable conditions but the ratio of sapflow to Penman evapotranspiration and the soil-to-leaf specific hydraulic conductance decreased severely towards the end of the dry season. Roots of #F. albida# were distributed through the weathered rock, down to a depth of 7 m, and vanished in the vicinity of a permanent water-table. Phreatophytism thus explained the maintenance of growth and transpiration during the dry season. Nevertheless, during early rains, delta18 O of sap switched towards the composition of the superficial soil layers, indicating facultative phreatophytism. Reverse phenology, low density and depth of water uptake of #F. albida# indicated a low competition with annual crops for water; the fraction of annual rainfall used by the trees was estimated to remain below 5%
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Subjects: | F60 - Physiologie et biochimie végétale, F08 - Systèmes et modes de culture, zone semi-aride, agroforesterie, phénologie, sécheresse, feuille, système racinaire, eau du sol, relation plante eau, compétition végétale, culture en mélange, http://aims.fao.org/aos/agrovoc/c_6963, http://aims.fao.org/aos/agrovoc/c_207, http://aims.fao.org/aos/agrovoc/c_5774, http://aims.fao.org/aos/agrovoc/c_2391, http://aims.fao.org/aos/agrovoc/c_4243, http://aims.fao.org/aos/agrovoc/c_16034, http://aims.fao.org/aos/agrovoc/c_7205, http://aims.fao.org/aos/agrovoc/c_16147, http://aims.fao.org/aos/agrovoc/c_35264, http://aims.fao.org/aos/agrovoc/c_4871, http://aims.fao.org/aos/agrovoc/c_165, http://aims.fao.org/aos/agrovoc/c_7497, |
Online Access: | http://agritrop.cirad.fr/392031/ http://agritrop.cirad.fr/392031/1/392031.pdf |
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dig-cirad-fr-3920312024-01-27T23:55:34Z http://agritrop.cirad.fr/392031/ http://agritrop.cirad.fr/392031/ Reverse phenology and dry-season water uptake by Faidherbia albida (Del.) A. Chev. in an agroforestry parkland of Sudanese West Africa. Roupsard Olivier, Ferhi A., Granier André, Pallo F., Depommier Denis, Mallet Bernard, Joly Hélène, Dreyer Erwin. 1999. Functional Ecology, 13 : 460-472.https://doi.org/10.1046/j.1365-2435.1999.00345.x <https://doi.org/10.1046/j.1365-2435.1999.00345.x> Reverse phenology and dry-season water uptake by Faidherbia albida (Del.) A. Chev. in an agroforestry parkland of Sudanese West Africa Roupsard, Olivier Ferhi, A. Granier, André Pallo, F. Depommier, Denis Mallet, Bernard Joly, Hélène Dreyer, Erwin eng 1999 Functional Ecology F60 - Physiologie et biochimie végétale F08 - Systèmes et modes de culture zone semi-aride agroforesterie phénologie sécheresse feuille système racinaire eau du sol relation plante eau compétition végétale culture en mélange http://aims.fao.org/aos/agrovoc/c_6963 http://aims.fao.org/aos/agrovoc/c_207 http://aims.fao.org/aos/agrovoc/c_5774 http://aims.fao.org/aos/agrovoc/c_2391 http://aims.fao.org/aos/agrovoc/c_4243 http://aims.fao.org/aos/agrovoc/c_16034 http://aims.fao.org/aos/agrovoc/c_7205 http://aims.fao.org/aos/agrovoc/c_16147 http://aims.fao.org/aos/agrovoc/c_35264 http://aims.fao.org/aos/agrovoc/c_4871 Afrique Soudan http://aims.fao.org/aos/agrovoc/c_165 http://aims.fao.org/aos/agrovoc/c_7497 #Faidherbia albida# (Acacia) is a multipurpose tree widely distributed in semiarid Africa, notably in agroforestry parklands. It is in leaf during the dry season and defoliated during the rainy season, displaying therefore a peculiar reverse phenology. The related water-use strategy, including leaf water potential, sapflow, hydraulic conductance and depth of uptake, were monitored on adult trees in a Sudanese west-African parkland. Despite a severe drought in the superficial soil layers, the predawn leaf water potential of #F. albida# dropped only to #ca.# - 0.5 MPa during the end of the dry season, indicating only a moderate water stress. Radial trunk growth ceased before the end of the dry season and could have been affected by the moderate drought stress. However, leafiness remained constant during the dry season. Leaf shedding occurred after the first rains and was probably independent of drought. #F. albida# displayed large transpiration rates under favourable conditions but the ratio of sapflow to Penman evapotranspiration and the soil-to-leaf specific hydraulic conductance decreased severely towards the end of the dry season. Roots of #F. albida# were distributed through the weathered rock, down to a depth of 7 m, and vanished in the vicinity of a permanent water-table. Phreatophytism thus explained the maintenance of growth and transpiration during the dry season. Nevertheless, during early rains, delta18 O of sap switched towards the composition of the superficial soil layers, indicating facultative phreatophytism. Reverse phenology, low density and depth of water uptake of #F. albida# indicated a low competition with annual crops for water; the fraction of annual rainfall used by the trees was estimated to remain below 5% article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/392031/1/392031.pdf text Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1046/j.1365-2435.1999.00345.x 10.1046/j.1365-2435.1999.00345.x http://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=91334 info:eu-repo/semantics/altIdentifier/doi/10.1046/j.1365-2435.1999.00345.x info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1046/j.1365-2435.1999.00345.x |
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F60 - Physiologie et biochimie végétale F08 - Systèmes et modes de culture zone semi-aride agroforesterie phénologie sécheresse feuille système racinaire eau du sol relation plante eau compétition végétale culture en mélange http://aims.fao.org/aos/agrovoc/c_6963 http://aims.fao.org/aos/agrovoc/c_207 http://aims.fao.org/aos/agrovoc/c_5774 http://aims.fao.org/aos/agrovoc/c_2391 http://aims.fao.org/aos/agrovoc/c_4243 http://aims.fao.org/aos/agrovoc/c_16034 http://aims.fao.org/aos/agrovoc/c_7205 http://aims.fao.org/aos/agrovoc/c_16147 http://aims.fao.org/aos/agrovoc/c_35264 http://aims.fao.org/aos/agrovoc/c_4871 http://aims.fao.org/aos/agrovoc/c_165 http://aims.fao.org/aos/agrovoc/c_7497 F60 - Physiologie et biochimie végétale F08 - Systèmes et modes de culture zone semi-aride agroforesterie phénologie sécheresse feuille système racinaire eau du sol relation plante eau compétition végétale culture en mélange http://aims.fao.org/aos/agrovoc/c_6963 http://aims.fao.org/aos/agrovoc/c_207 http://aims.fao.org/aos/agrovoc/c_5774 http://aims.fao.org/aos/agrovoc/c_2391 http://aims.fao.org/aos/agrovoc/c_4243 http://aims.fao.org/aos/agrovoc/c_16034 http://aims.fao.org/aos/agrovoc/c_7205 http://aims.fao.org/aos/agrovoc/c_16147 http://aims.fao.org/aos/agrovoc/c_35264 http://aims.fao.org/aos/agrovoc/c_4871 http://aims.fao.org/aos/agrovoc/c_165 http://aims.fao.org/aos/agrovoc/c_7497 |
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F60 - Physiologie et biochimie végétale F08 - Systèmes et modes de culture zone semi-aride agroforesterie phénologie sécheresse feuille système racinaire eau du sol relation plante eau compétition végétale culture en mélange http://aims.fao.org/aos/agrovoc/c_6963 http://aims.fao.org/aos/agrovoc/c_207 http://aims.fao.org/aos/agrovoc/c_5774 http://aims.fao.org/aos/agrovoc/c_2391 http://aims.fao.org/aos/agrovoc/c_4243 http://aims.fao.org/aos/agrovoc/c_16034 http://aims.fao.org/aos/agrovoc/c_7205 http://aims.fao.org/aos/agrovoc/c_16147 http://aims.fao.org/aos/agrovoc/c_35264 http://aims.fao.org/aos/agrovoc/c_4871 http://aims.fao.org/aos/agrovoc/c_165 http://aims.fao.org/aos/agrovoc/c_7497 F60 - Physiologie et biochimie végétale F08 - Systèmes et modes de culture zone semi-aride agroforesterie phénologie sécheresse feuille système racinaire eau du sol relation plante eau compétition végétale culture en mélange http://aims.fao.org/aos/agrovoc/c_6963 http://aims.fao.org/aos/agrovoc/c_207 http://aims.fao.org/aos/agrovoc/c_5774 http://aims.fao.org/aos/agrovoc/c_2391 http://aims.fao.org/aos/agrovoc/c_4243 http://aims.fao.org/aos/agrovoc/c_16034 http://aims.fao.org/aos/agrovoc/c_7205 http://aims.fao.org/aos/agrovoc/c_16147 http://aims.fao.org/aos/agrovoc/c_35264 http://aims.fao.org/aos/agrovoc/c_4871 http://aims.fao.org/aos/agrovoc/c_165 http://aims.fao.org/aos/agrovoc/c_7497 Roupsard, Olivier Ferhi, A. Granier, André Pallo, F. Depommier, Denis Mallet, Bernard Joly, Hélène Dreyer, Erwin Reverse phenology and dry-season water uptake by Faidherbia albida (Del.) A. Chev. in an agroforestry parkland of Sudanese West Africa |
description |
#Faidherbia albida# (Acacia) is a multipurpose tree widely distributed in semiarid Africa, notably in agroforestry parklands. It is in leaf during the dry season and defoliated during the rainy season, displaying therefore a peculiar reverse phenology. The related water-use strategy, including leaf water potential, sapflow, hydraulic conductance and depth of uptake, were monitored on adult trees in a Sudanese west-African parkland. Despite a severe drought in the superficial soil layers, the predawn leaf water potential of #F. albida# dropped only to #ca.# - 0.5 MPa during the end of the dry season, indicating only a moderate water stress. Radial trunk growth ceased before the end of the dry season and could have been affected by the moderate drought stress. However, leafiness remained constant during the dry season. Leaf shedding occurred after the first rains and was probably independent of drought. #F. albida# displayed large transpiration rates under favourable conditions but the ratio of sapflow to Penman evapotranspiration and the soil-to-leaf specific hydraulic conductance decreased severely towards the end of the dry season. Roots of #F. albida# were distributed through the weathered rock, down to a depth of 7 m, and vanished in the vicinity of a permanent water-table. Phreatophytism thus explained the maintenance of growth and transpiration during the dry season. Nevertheless, during early rains, delta18 O of sap switched towards the composition of the superficial soil layers, indicating facultative phreatophytism. Reverse phenology, low density and depth of water uptake of #F. albida# indicated a low competition with annual crops for water; the fraction of annual rainfall used by the trees was estimated to remain below 5% |
format |
article |
topic_facet |
F60 - Physiologie et biochimie végétale F08 - Systèmes et modes de culture zone semi-aride agroforesterie phénologie sécheresse feuille système racinaire eau du sol relation plante eau compétition végétale culture en mélange http://aims.fao.org/aos/agrovoc/c_6963 http://aims.fao.org/aos/agrovoc/c_207 http://aims.fao.org/aos/agrovoc/c_5774 http://aims.fao.org/aos/agrovoc/c_2391 http://aims.fao.org/aos/agrovoc/c_4243 http://aims.fao.org/aos/agrovoc/c_16034 http://aims.fao.org/aos/agrovoc/c_7205 http://aims.fao.org/aos/agrovoc/c_16147 http://aims.fao.org/aos/agrovoc/c_35264 http://aims.fao.org/aos/agrovoc/c_4871 http://aims.fao.org/aos/agrovoc/c_165 http://aims.fao.org/aos/agrovoc/c_7497 |
author |
Roupsard, Olivier Ferhi, A. Granier, André Pallo, F. Depommier, Denis Mallet, Bernard Joly, Hélène Dreyer, Erwin |
author_facet |
Roupsard, Olivier Ferhi, A. Granier, André Pallo, F. Depommier, Denis Mallet, Bernard Joly, Hélène Dreyer, Erwin |
author_sort |
Roupsard, Olivier |
title |
Reverse phenology and dry-season water uptake by Faidherbia albida (Del.) A. Chev. in an agroforestry parkland of Sudanese West Africa |
title_short |
Reverse phenology and dry-season water uptake by Faidherbia albida (Del.) A. Chev. in an agroforestry parkland of Sudanese West Africa |
title_full |
Reverse phenology and dry-season water uptake by Faidherbia albida (Del.) A. Chev. in an agroforestry parkland of Sudanese West Africa |
title_fullStr |
Reverse phenology and dry-season water uptake by Faidherbia albida (Del.) A. Chev. in an agroforestry parkland of Sudanese West Africa |
title_full_unstemmed |
Reverse phenology and dry-season water uptake by Faidherbia albida (Del.) A. Chev. in an agroforestry parkland of Sudanese West Africa |
title_sort |
reverse phenology and dry-season water uptake by faidherbia albida (del.) a. chev. in an agroforestry parkland of sudanese west africa |
url |
http://agritrop.cirad.fr/392031/ http://agritrop.cirad.fr/392031/1/392031.pdf |
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