Allometric relationships and peak-season community biomass stocks of native shrubs in Senegal's Peanut Basin |
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| Authors: | A Lufafa I Diédhiou NAS Ndiaye M Séné F Kizito RP Dick JS Noller |
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| Institution: | 1. INECOA-CONICET-UNJu, San Salvador de Jujuy, Argentina;2. Facultad de Ciencias Agrarias, Universidad Nacional de Jujuy, San Salvador de Jujuy, Argentina;3. Laboratorio de Investigación de Sistemas Ecológicos y Ambientales, Universidad Nacional de La Plata, La Plata, Argentina;4. Departamento de Ciencias Sociales, Universidad Nacional de Luján, Luján, Argentina;5. VICAM: Vicuñas, camelids and environment, Argentina;6. CONICET: Consejo Nacional de Investigaciones Científicas y Técnicas (National Research Council), Argentina |
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| Abstract: | Allometric equations and community biomass stocks are presented for Guiera senegalensis J.F. Gmel (Gs) and Piliostigma reticulatum (DC.) Hochst (Pr) – two native shrub species in the Sahel. These shrubs are of interest because they dominate semi-arid sub-Sahalien Africa but have been largely overlooked as a key biomass component and regulator of ecosystem composition and function in this landscape. In Year 1, best predictors of aboveground biomass were height and number of stems (Gs) and crown diameter (Pr); and for belowground biomass were height and basal diameter (Gs) and basal diameter (Pr). In Year 2, height and crown diameter were the best predictors of aboveground biomass (R2 = 0.90 for Gs and 0.87 for Pr), whereas basal diameter and number of stems (Gs) and basal diameter (Pr) were best predictors of belowground biomass. Peak-season biomass estimates ranged from 0.44 to 4.58 ton ha?1 (mean = 2.38 ton ha?1) in the Gs sites and from 0.33 to 7.38 ton ha?1 (mean = 3.71 ton ha?1) in the Pr communities. Both species exhibited unusually large root:shoot ratios (4.5:1 for Gs and 10.2:1 for Pr). Although models differ between years, allometric relationships provide reasonable biomass estimates for Gs and Pr. |
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