Carbon, nitrogen and phosphorus allocation in agro-ecosystems of a West African savanna

Manlay, Raphaël J.; Kairé, Maguette; Massé, Dominique; Chotte, Jean‐Luc; Ciornei, Gilles; Floret, C.

doi:10.1016/s0167-8809(01)00218-3

Cited by 45 publications

(35 citation statements)

References 15 publications

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“…The North-South gradient in carbon storage potential for the MAXINT scenario (Fig. 6a) is also consistent with the difference between these figures, and higher SOC increases (+9.9 tC ha −1 ) measured by Manlay et al (2002) in the Kolda region (for an administrative map of Senegal, see Appendix 2). These increases are important compared to the existing SOC stocks of 15-30 tC ha −1 in the 0-40 cm layer (Woomer et al 2004).…”

Section: Avoided Deforestationsupporting

confidence: 83%

“…Only variations in the 0-20 cm layer have been considered, 2 since the influence of management below this depth has been found to be of small magnitude (Tiessen et al 1998;Manlay et al 2002;Elberling et al 2003). The standard of the International Panel on Climate Change (IPCC) is 30 cm, but it may not be relevant for carbon sequestration projects in agricultural soils as the costs of monitoring the 20-30 cm depth may override the potential increase in SOC stocks there, and since only shallow tillage is practised.…”

Section: Data Collectionmentioning

confidence: 99%

“…Also, organic inputs would probably be more protected from decomposition in depleted agricultural soils than in pastures where the threshold of SOC protection by clays may already be attained (Breman 1998;Six et al 2002). Finally, manure has been shown to actually increase SOC content only if associated with mineral inputs in South Senegal (Manlay et al 2002), something unlikely to happen in pastures unless they are also fertilized with synthetic inputs.…”

Section: Organic Matter Displacementmentioning

confidence: 99%

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Multi-criteria spatialization of soil organic carbon sequestration potential from agricultural intensification in Senegal

Bellassen¹,

Manlay²,

Chéry³

et al. 2009

Climatic Change

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On the eve of the 15th climate negotiations conference in Copenhagen,the pressure to assess all climate mitigation options is mounting. In this study, abio-physic model and a socio-economic model were designed and coupled to assessthe carbon sequestration potential of agricultural intensification in Senegal. Thebiophysicalmodel is a multiple linear regression, calibrated and tested on a dataset oflong-term agricultural trials established in West Africa. The socio-economic modelintegrates both financial and environmental costs related to considered practicechanges. Both models are spatially explicit and the resulting spatial patterns werecomputed and displayed over Senegal with a geographic information system. The national potential from large-scale intensification was assessed at 0.65–0.83 MtC.With regards to local-scaled intensification as local projects, the most profitable areaswere identified in agricultural expansion regions (especially Casamance), while theareas that meet the current financial additionality criteria of the Clean DevelopmentMechanism were located in the northern part of the Peanut Basin. Using the currentrelevant mode of carbon valuation (Certified Emission Reductions), environmentalbenefits are small compared to financial benefits. This picture is radically changedif “avoided deforestation”, a likely consequence of agricultural intensification, isaccounted for as the greenhouse gases sink capacity of projects increases by anaverage of a hundred-fold over Senegal

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Section: Avoided Deforestationsupporting

confidence: 83%

Section: Data Collectionmentioning

confidence: 99%

Section: Organic Matter Displacementmentioning

confidence: 99%

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Multi-criteria spatialization of soil organic carbon sequestration potential from agricultural intensification in Senegal

Bellassen¹,

Manlay²,

Chéry³

et al. 2009

Climatic Change

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“…We did not quantify surface litter C because movement of this component by wind across the landscape made it difficult to trace its source with reasonable accuracy. However, work conducted elsewhere in Senegal (Manlay et al, 2002;Woomer et al, 2004b) shows that this may be a relatively large C pool ranging from 0.493-0.980 Mg C ha − 1 .…”

Section: Biomass C Stocksmentioning

confidence: 99%

“…A number of studies of C stocks in the Peanut Basin have been done that have had a range of estimates for the vegetative component (Woomer, 1993;Bationo et al, 1998;Manlay, 2000;Bationo and Buerkert, 2001;Batjes, 2001;Manley et al, 2002;Liu et al, 2004;Tschakert et al, 2004;Woomer et al, 2004a,b). However, these studies have had various levels of resolution and generally neglected the importance of the shrub component.…”

Section: Introductionmentioning

confidence: 99%

Carbon stocks and patterns in native shrub communities of Senegal's Peanut Basin

et al. 2008

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The effect of aboveground biomass removal on soil macronutrient over time in Munesa Shashemane, Ethiopia

Madalcho

2016

Food and Energy Security

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This study aims to compare the proportion of macronutrients in different parts of the aboveground biomass; and to estimate the amount of macronutrient loss from continuous farmlands (mechanized farm and traditional farm) and plantation stands (Cupresus lusitanica and Eucalyptus saligna) through harvesting. From 20 × 20 m 2 sized sample plots, a representative samples were collected from leaf, branch and stem of the plantation stands. Macronutrient analyses were carried out for the samples taken from plantations and maize crops on continuous farmlands. All data collected were subjected to ANOVA using the general linear model of SAS 9.0 at P < 0.05. The results of macronutrient in aboveground biomass of maize in the continuous farm lands shows that, the grain component contained as much as 50% of N and 60% of P compared to leaf and stem. However, a high proportion of K, Ca, and Mg were found in the leaf and stem components. In the case of C. lusitanica, 64.4% N, 70% P, 68.4% K, 65.3% Ca, and 68.75% of Mg was found in the stem compared to the leaf and branch. In the E. saligna, the stem contained 22% N, 30% P, 11.8% K, 26.6% Ca, and 12.5% Mg; with the remaining proportion of each nutrient found in the leaf and branch. Based on the results, much of the nutrients can be removed through the leaf and stem removal in the continuous farmlands. Complete removal of the biomass with little residue returned to the soil, for long periods under plantation land use, may also lead to macronutrient depletion. Therefore, to minimize this effect, the aboveground biomass harvest should focus on grain only on the farmlands, and stem only on the plantations. 57

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Carbon, nitrogen and phosphorus allocation in agro-ecosystems of a West African savanna

Cited by 45 publications

References 15 publications

Multi-criteria spatialization of soil organic carbon sequestration potential from agricultural intensification in Senegal

Multi-criteria spatialization of soil organic carbon sequestration potential from agricultural intensification in Senegal

Carbon stocks and patterns in native shrub communities of Senegal's Peanut Basin

The effect of aboveground biomass removal on soil macronutrient over time in Munesa Shashemane, Ethiopia

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