AURIFERE
PORTAIL DOCUMENTAIRE DE L'INSTITUT SENEGALAIS DE RECHERCHES AGRICOLES
Elaboré par
L’Unité d’Information et de Valorisation des Résultats de la Recherche (UNIVAL)
'Un Accès Unique aux Ressources d’Information et aux Fonds documentaires pour une Recherche d’Excellence '
A partir de cette page vous pouvez :
Retourner au premier écran avec les dernières notices... |
Détail de la série
Série Geoderma
Documents disponibles dans cette série
Geoderma. Influence of the controlled dual ectomycorrhizal and rhizobal symbiosis on the growth of Acacia mangium provenances, the indigenous symbiotic microflora and the structure of plant parasitic nematode communities / Robin Duponnois
Geoderma. Influence of the controlled dual ectomycorrhizal and rhizobal symbiosis on the growth of Acacia mangium provenances, the indigenous symbiotic microflora and the structure of plant parasitic nematode communities [texte imprimé] / Robin Duponnois, Auteur ; H Founoune, Auteur ; D Lesueur, Auteur . - (FR) : IRD, 2002 . - 18p. : ref,;.
Langues : Anglais (eng)
Catégories : FORESTERIE Mots-clés : Ectomycorhize, Acacia, Structure de la Plante, Nématode, Biomasse Index. décimale : K110-Génie forestier Exemplaires
Code-barres Cote Support Localisation Section Disponibilité PV1700018 K110-DUP Article scientifique LNRPV Rayons Exclu du prêt Documents numériques
Cliquer pour voir pdfURL Geoderma, n° 148 (2009). Carbon, nitrogen and phosphorus mineralization potential of semiarid Sahelian soils amended with native shrub residues / E. L Dossa
Geoderma, n° 148 (2009). Carbon, nitrogen and phosphorus mineralization potential of semiarid Sahelian soils amended with native shrub residues [texte imprimé] / E. L Dossa, Auteur ; Mamadou Khouma, Auteur ; I. Diedhiou, Auteur ; M. Sène, Auteur ; F. Kizito, Auteur ; A. N. Badiane, Auteur ; Arona Ndiaye Samba Samba, Auteur ; Richard P. Dick, Auteur . - [s.d.] . - pp. 251–260.
Langues : Anglais (eng)
Catégories : RESSOURCES NATURELLES ET ENVIRONNEMENT Mots-clés : Carbone, Azote, Phosphore, Immobilisation, Minéralisation, Cycle des nutriments, Guiera senegalensis, Piliostigma reticulatum, Sénégal Index. décimale : P355-Fertilisation du sol. Besoins en engrais et amendement. Alimentation minérale des plantes. Réponse des plantes Résumé : Two native shrubs (Piliostigma reticulatum and Guiera senegalensis) commonly coexist with crops in fields throughout the Sahel but aboveground residue is annually coppiced and burned. An alternative, with potential to improve soil quality, would be non-thermal return of residues to soils but information is needed on the potential of residues’ to provide nutrients before such systems can be adopted. The objective of this research was to characterize carbon (C), net nitrogen (N) and phosphorus (P) mineralization of shrub residues during decomposition in soil beneath or outside shrub canopies. Two lab incubation (30 °C for 118 days) studies (1 for each shrub species/soil type system) had a 2 by 4 factorial design with two soil sources (beneath or outside the shrub canopy) and four residue soil amendments (leaf, leaf+stem, beef manure, or control of soil only). Soils amended with P. reticulatum or G. senegalensis leaf residues immobilized N during the first 62 and 76 days, respectively, but later had net release of inorganic N. The addition of stems to leaf amendments for both shrub species resulted in net N immobilization throughout the incubation. Manure had positive but shrub residues negative release of inorganic P. However, if the leached P released at time zero is included in the summation, all amendments released more P than the control. Cumulative net release of C, N or P over the incubation was higher in soil originating from beneath than outside the shrub canopy except for release of P from soil associated with G. senegalensis. Residue chemistry was related to nutrient release, particularly high lignin content of stems, which corresponded to N immobilization. Our results suggest that none of the shrub residues when added to soil would potentially provide short-term plant available N and that additional fertilizer would be required for optimal crop yield. Exemplaires
Code-barres Cote Support Localisation Section Disponibilité CN1800021 P355-DOS Publication CNRA/Bambey Rayons Exclu du prêt Documents numériques
Cliquer pour le pdfURL Geoderma, N° 146. Carbon stocks and patterns in native shrub communities of Senegal's Peanut Basin / A. Lufafa
Geoderma, N° 146. Carbon stocks and patterns in native shrub communities of Senegal's Peanut Basin [texte imprimé] / A. Lufafa, Auteur ; J. Bolte, Auteur ; I. Diedhiou, Auteur ; Arona Ndiaye Samba Samba, Auteur ; M. Sène, Auteur ; Mamadou Khouma, Auteur ; F. Kizito, Auteur ; Richard P. Dick, Auteur ; E. L Dossa, Auteur ; J.S. Noller, Auteur . - [s.d.] . - 8 p.
Langues : Anglais (eng)
Catégories : RESSOURCES NATURELLES ET ENVIRONNEMENT Mots-clés : Equations allométriques, Production de biomasse, Géostatistique, Guiera senegalensis, Piliostigma reticulatum, Carbone organique du sol, Tropique Index. décimale : P340-Biologie et biochimie du sol Résumé : Accurate and reliable estimates of carbon (C) storage in landscapes are critical to the development of effective policies and strategies to mitigate atmospheric and climate change. Carbon stocks of two native woody shrub (Guiera senegalensis J.F. Gmel and Piliostigma reticulatum (DC.) Hochst) communities and associated soils within Senegal's Peanut Basin were determined and the spatial structure of soil C quantified. These shrubs are of interest because they dominate semiarid sub-Sahalien Africa and commonly coexist with rowcrops but have been largely overlooked as a key vegetative component of this landscape. Peak-season shrub biomass C was measured in forty-five 0.81 ha plots at 8 locations using allometric relationships along with soil sampling (0 to 40 cm depth) and analysis for organic C and bulk density. Soil samples to a depth of 20 cm were taken every 2 m in 24×20 m grids and every 0.5 m in four nested 3 m×3 m grids containing at least one shrub or tree canopy, and geostatistical techniques were then used to quantify scale and degree of soil C spatial dependence. Estimates of peak-season biomass C ranged from 0.9 Mg C ha−1 to 1.4 Mg C ha−1 with an overall mean of 1.12 Mg C ha−1 (SEM=0.079) in the G. senegalensis sites and from 1.3 to 2.0 Mg C ha−1 (mean=1.57 Mg C ha−1; SEM=0.18) in the P. reticulatum communities. The overall mean of SOC to 40 cm was 17 and 17.2 Mg C ha−1 respectively, at the G. senegalensis and P. reticulatum sites with 57% of that C residing in the top 20 cm. Semivariograms of soil C showed moderate spatial dependence and spatial autocorrelation at distances of less than 0.56 and 1.34 m at the G. senegalensis and P. reticulatum sites, respectively. Comparison across the different grids showed that the presence of shrub canopies at either site had much closer relationship to soil C levels than trees. Exemplaires
Code-barres Cote Support Localisation Section Disponibilité CN1800032 P340-LUF Publication CNRA/Bambey Rayons Exclu du prêt Documents numériques
Cliquer pour le pdfURL