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.

Saved in:
Bibliographic Details
Main Authors: Roupsard, Olivier, Faye, W., Sow, Sidy, Diongue, Djim M.L., Orange, Didier, Do, Frédéric C., Jourdan, Christophe, Stumpp, Christine, Faye, Serigne
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