Inverted phenology of Faidherbia albida paced with the dynamics of the water table
Faidherbia albida is an emblematic species of agro-sylvo-pastoralism in African semi-arid areas. It combines inverted phenology (strong growth, N-fixation and production of highly palatable fodder during the dry season, ideal for livestock), defoliation during the rainy season (ideal for minimizing competition with crops) and use of deep resources mainly (riparian in its natural habitat, phreatophyte in parklands, deeply rooted, avoiding drought stress, using mostly groundwater (isotopic evidence), ideal for recycling). What could drive the inverted phenology then? Past research most often sought to correlate its peculiar phenology with climate variables, but hardly considered its deep roots and phreatophyte behavior. We set up a collaborative observatory (Faidherbia-Flux ) in a Senegal parkland in 2018 and monitored the foliar phenology of 15 adult trees (LAI2000), radial growth, sap flow and wood water content (capacitive probes). We also monitored the dynamics of soil humidity (TDR profiles) and water table fluctuations (5-6 m, piezometers). Drainage did reach the water table, but its maximum level was delayed till the end of the wet season, corresponding to the time when Faidherbia emitted new leaves. 100% foliage was maintained until the end of December, concurrently with a maximum growth, sap flow and water table level. From January to July (driest period), we observed a slow decrease in the water table level, foliage and transpiration, all reaching minima by the end of July (start of the defoliated phase), but no drought stress. Interestingly, wood rehydrated till end of the rainy season (September-October). Considering such coincidences between deep hydrological (delayed rewatering), wood rehydratation and phenological phases (inverted phenology), we suggest that this deeply rooted and phreatophyte species adjusts its phenology according to the water table and wood water content, shedding leaves when those levels reached minimum and bursting only when they resumed to maximum.
Main Authors: | , , , , , , , , |
---|---|
Format: | conference_item biblioteca |
Language: | eng |
Published: |
Université de Laval
|
Online Access: | http://agritrop.cirad.fr/601937/ http://agritrop.cirad.fr/601937/1/ID601937.pdf |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
dig-cirad-fr-601937 |
---|---|
record_format |
koha |
spelling |
dig-cirad-fr-6019372024-11-08T17:24:30Z http://agritrop.cirad.fr/601937/ http://agritrop.cirad.fr/601937/ Inverted phenology of Faidherbia albida paced with the dynamics of the water table. Roupsard Olivier, Faye W., Sow Sidy, Diongue Djim M.L., Orange Didier, Do Frédéric C., Jourdan Christophe, Stumpp Christine, Faye Serigne. 2022. In : En transition vers un monde viable. Québec : Université de Laval-IUAF-ICRAF, Résumé, 1 p. Congrès mondial d'agroforesterie. 5, Québec, Canada, 17 Juillet 2022/20 Juillet 2022.https://www.agroforestry2022.org/fr <https://www.agroforestry2022.org/fr> Inverted phenology of Faidherbia albida paced with the dynamics of the water table Roupsard, Olivier Faye, W. Sow, Sidy Diongue, Djim M.L. Orange, Didier Do, Frédéric C. Jourdan, Christophe Stumpp, Christine Faye, Serigne eng 2022 Université de Laval En transition vers un monde viable Faidherbia albida is an emblematic species of agro-sylvo-pastoralism in African semi-arid areas. It combines inverted phenology (strong growth, N-fixation and production of highly palatable fodder during the dry season, ideal for livestock), defoliation during the rainy season (ideal for minimizing competition with crops) and use of deep resources mainly (riparian in its natural habitat, phreatophyte in parklands, deeply rooted, avoiding drought stress, using mostly groundwater (isotopic evidence), ideal for recycling). What could drive the inverted phenology then? Past research most often sought to correlate its peculiar phenology with climate variables, but hardly considered its deep roots and phreatophyte behavior. We set up a collaborative observatory (Faidherbia-Flux ) in a Senegal parkland in 2018 and monitored the foliar phenology of 15 adult trees (LAI2000), radial growth, sap flow and wood water content (capacitive probes). We also monitored the dynamics of soil humidity (TDR profiles) and water table fluctuations (5-6 m, piezometers). Drainage did reach the water table, but its maximum level was delayed till the end of the wet season, corresponding to the time when Faidherbia emitted new leaves. 100% foliage was maintained until the end of December, concurrently with a maximum growth, sap flow and water table level. From January to July (driest period), we observed a slow decrease in the water table level, foliage and transpiration, all reaching minima by the end of July (start of the defoliated phase), but no drought stress. Interestingly, wood rehydrated till end of the rainy season (September-October). Considering such coincidences between deep hydrological (delayed rewatering), wood rehydratation and phenological phases (inverted phenology), we suggest that this deeply rooted and phreatophyte species adjusts its phenology according to the water table and wood water content, shedding leaves when those levels reached minimum and bursting only when they resumed to maximum. conference_item info:eu-repo/semantics/conferenceObject Conference info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/601937/1/ID601937.pdf text Cirad license info:eu-repo/semantics/openAccess https://agritrop.cirad.fr/mention_legale.html https://www.agroforestry2022.org/fr info:eu-repo/semantics/altIdentifier/purl/https://www.agroforestry2022.org/fr info:eu-repo/semantics/reference/purl/https://conferium.com/Clients/226_web/index.lasso?lang=fr |
institution |
CIRAD FR |
collection |
DSpace |
country |
Francia |
countrycode |
FR |
component |
Bibliográfico |
access |
En linea |
databasecode |
dig-cirad-fr |
tag |
biblioteca |
region |
Europa del Oeste |
libraryname |
Biblioteca del CIRAD Francia |
language |
eng |
description |
Faidherbia albida is an emblematic species of agro-sylvo-pastoralism in African semi-arid areas. It combines inverted phenology (strong growth, N-fixation and production of highly palatable fodder during the dry season, ideal for livestock), defoliation during the rainy season (ideal for minimizing competition with crops) and use of deep resources mainly (riparian in its natural habitat, phreatophyte in parklands, deeply rooted, avoiding drought stress, using mostly groundwater (isotopic evidence), ideal for recycling). What could drive the inverted phenology then? Past research most often sought to correlate its peculiar phenology with climate variables, but hardly considered its deep roots and phreatophyte behavior. We set up a collaborative observatory (Faidherbia-Flux ) in a Senegal parkland in 2018 and monitored the foliar phenology of 15 adult trees (LAI2000), radial growth, sap flow and wood water content (capacitive probes). We also monitored the dynamics of soil humidity (TDR profiles) and water table fluctuations (5-6 m, piezometers). Drainage did reach the water table, but its maximum level was delayed till the end of the wet season, corresponding to the time when Faidherbia emitted new leaves. 100% foliage was maintained until the end of December, concurrently with a maximum growth, sap flow and water table level. From January to July (driest period), we observed a slow decrease in the water table level, foliage and transpiration, all reaching minima by the end of July (start of the defoliated phase), but no drought stress. Interestingly, wood rehydrated till end of the rainy season (September-October). Considering such coincidences between deep hydrological (delayed rewatering), wood rehydratation and phenological phases (inverted phenology), we suggest that this deeply rooted and phreatophyte species adjusts its phenology according to the water table and wood water content, shedding leaves when those levels reached minimum and bursting only when they resumed to maximum. |
format |
conference_item |
author |
Roupsard, Olivier Faye, W. Sow, Sidy Diongue, Djim M.L. Orange, Didier Do, Frédéric C. Jourdan, Christophe Stumpp, Christine Faye, Serigne |
spellingShingle |
Roupsard, Olivier Faye, W. Sow, Sidy Diongue, Djim M.L. Orange, Didier Do, Frédéric C. Jourdan, Christophe Stumpp, Christine Faye, Serigne Inverted phenology of Faidherbia albida paced with the dynamics of the water table |
author_facet |
Roupsard, Olivier Faye, W. Sow, Sidy Diongue, Djim M.L. Orange, Didier Do, Frédéric C. Jourdan, Christophe Stumpp, Christine Faye, Serigne |
author_sort |
Roupsard, Olivier |
title |
Inverted phenology of Faidherbia albida paced with the dynamics of the water table |
title_short |
Inverted phenology of Faidherbia albida paced with the dynamics of the water table |
title_full |
Inverted phenology of Faidherbia albida paced with the dynamics of the water table |
title_fullStr |
Inverted phenology of Faidherbia albida paced with the dynamics of the water table |
title_full_unstemmed |
Inverted phenology of Faidherbia albida paced with the dynamics of the water table |
title_sort |
inverted phenology of faidherbia albida paced with the dynamics of the water table |
publisher |
Université de Laval |
url |
http://agritrop.cirad.fr/601937/ http://agritrop.cirad.fr/601937/1/ID601937.pdf |
work_keys_str_mv |
AT roupsardolivier invertedphenologyoffaidherbiaalbidapacedwiththedynamicsofthewatertable AT fayew invertedphenologyoffaidherbiaalbidapacedwiththedynamicsofthewatertable AT sowsidy invertedphenologyoffaidherbiaalbidapacedwiththedynamicsofthewatertable AT dionguedjimml invertedphenologyoffaidherbiaalbidapacedwiththedynamicsofthewatertable AT orangedidier invertedphenologyoffaidherbiaalbidapacedwiththedynamicsofthewatertable AT dofredericc invertedphenologyoffaidherbiaalbidapacedwiththedynamicsofthewatertable AT jourdanchristophe invertedphenologyoffaidherbiaalbidapacedwiththedynamicsofthewatertable AT stumppchristine invertedphenologyoffaidherbiaalbidapacedwiththedynamicsofthewatertable AT fayeserigne invertedphenologyoffaidherbiaalbidapacedwiththedynamicsofthewatertable |
_version_ |
1816147719647920128 |