Principaux indices de l’intensité du feu dans une savane Guinéenne d’Afrique de l’Ouest

N’Dri, Aya Brigitte; Fongbe, Madoussou; Soro, Tionhonkélé Drissa; Gignoux, Jacques; Kone, Mouhamadou; Dosso, Kanvaly; N’Dri, Julien K.; Koné, N’golo Abdoulaye

doi:10.4314/ijbcs.v12i1.21

Cited by 8 publications

(12 citation statements)

References 22 publications

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“…Fire severity on woody vegetation closely varies with many factors such as fire season, fuel load, fuel moisture content, wind speed, fire intensity, fire residence time, fire spread rate etc. [38,44,45]. Based on N'Dri et al studies [38,44,45] run on three different sites of LSR during four fire cycles, the average spread rate and average intensity of mid-dry season fire were 0.14 ± 0.03 ms -1 and 3920 ± 740 kWm -1 , respectively.…”

Section: Study Sitementioning

confidence: 99%

“…[38,44,45]. Based on N'Dri et al studies [38,44,45] run on three different sites of LSR during four fire cycles, the average spread rate and average intensity of mid-dry season fire were 0.14 ± 0.03 ms -1 and 3920 ± 740 kWm -1 , respectively. The maximum fire temperature was about 10 times higher than the commonly accepted lethal temperature for plant cells, which is 60°C [46].…”

Section: Study Sitementioning

confidence: 99%

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A Quantitative Index Based on Leaf Heteroblasty for Predicting Root Biomass in a Frequently Burned Savanna Species: Cussonia arborea Hochst. Ex A. Rich. (Araliaceae)

Kouamé

Millan

N’Dri

et al. 2021

IJPSS

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Background: Biotic and abiotic disturbances such as frequent wildfires and herbivory contribute to maintain trees and grasses coexistence in savanna ecosystems. In comparison to stems and leaves, exposed to fire and herbivory, the roots, protected by being belowground, are less affected by these disturbances. Therefore, indirect estimation of belowground biomass (BGB) of savanna trees from simple allometric relations based on stem measurements can lead to major biases. Aims: In this study we explored how the Leaf ontogenetic change index (LOCI), a quantitative index based on leaf heteroblastic development, can provide an accurate estimate of BGB in Cussonia arborea, a widespread species in West African humid savannas. Methodology: We examined leaf morphometrics on post-fire resprouts of 40 individuals to assess whether LOCI can inform on plant age. We then analyzed by log-level regressions the variation of LOCI in relation to plant stem volume. Subsequently, we studied the variation of BGB according to stem volume, and as a function of both stem volume and LOCI, which allowed us to evaluate the contribution of LOCI to BGB estimation. BGB was obtained destructively by digging up roots and weighing total dry mass of 25 individuals including small and large trees. Statistical analyses were done with the R software. Place and Duration of Study: Study was performed in the Lamto Scientific Reserve, Côte d’Ivoire, between May 2020 and June 2021. Results: Using the stem volume as single explanatory variable of BGB, the regression model provided an adjusted R2 of 0.71. Association of the stem volume with LOCI increased the adjusted R2 from 0.71 to 0.90. Conclusion: Combining LOCI with a measure of stem size provides better estimate of BGB in C. arborea compared to estimate based on stem size only. Since a large proportion of woody species in frequently disturbed environments exhibit an overall strategies promoting persistence, future works should evaluate how these strategies are modulated during ontogeny and can explain biomass variation over time.

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Section: Study Sitementioning

confidence: 99%

Section: Study Sitementioning

confidence: 99%

A Quantitative Index Based on Leaf Heteroblasty for Predicting Root Biomass in a Frequently Burned Savanna Species: Cussonia arborea Hochst. Ex A. Rich. (Araliaceae)

Kouamé

Millan

N’Dri

et al. 2021

IJPSS

Self Cite

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“…have been carried out at the Geophysical station since 1962 (Abbadie et al, 2006;Diawara et al, 2014). In addition, the mean annual rainfall and temperature records are at 1194 mm and 27.8 C, respectively (Diawara et al, 2014;N'dri et al, 2018). The climate of this area is controlled by the West African Monsoon (WAM) with the main dry season (GSS) from December to February, the main rainy season (GSP) from March to July, a short dry season (PSS) in August and a short rainy season from September to November (Fig.…”

Section: Study Areamentioning

confidence: 99%

Analysis of the temporal variability of CO<sub>2</sub>, CH<sub>4</sub> and CO concentrations at Lamto, West Africa

Tiémoko

Ramonet

Yoroba

et al. 2021

Tellus B: Chemical and Physical Meteorology

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“…The region is of about 160 km north of Abidjan and its climate is controlled by the West African Monsoon (WAM). The recorded annual mean rainfall is about 1200 mm, with important seasonal and interannual variability [24] while the mean annual temperature is ~27˚C with a seasonal temperature range of ±2˚C [25]. The main dry season extends from December to February and the wet season is from March to November, with a short dry season in August ( Figure 2).…”

Section: Study Areamentioning

confidence: 99%

Understanding the Local Carbon Fluxes Variations and Their Relationship to Climate Conditions in a Sub-Humid Savannah-Ecosystem during 2008-2015: Case of Lamto in Cote d’Ivoire

Tiémoko¹,

Yoroba²,

Diawara³

et al. 2020

ACS

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The temporal variations of the Gross Primary Productivity (GPP), the Total Ecosystem Respiration (TER) and the Net Ecosystem Exchange (NEE), and their responses to meteorological conditions (e.g. temperature, radiative flux and precipitation) at Lamto, in wet savannah region across Côte d'Ivoire are analyzed using GFED-CASA and daily meteorological data recorded over the 2008-2015 period. The study shows the links between these carbon fluxes and climate variability at Lamto that is subject to high anthropogenic pressures and seasonal bushfires. The correlative statistics from multiple regression methods were used to assess the different relationships and show how they change in time. The results show important seasonal variability in the Gross Primary Productivity and the Total Ecosystem Respiration mainly associated with the changes in temperature and radiative flux. In addition, the statistical analysis suggests a high correlation between meteorological conditions and the GPP and TER. These climatic conditions may explain 83% and 79% of the variances of GPP and TER respectively. Moreover, the interannual variability of the Net Ecosystem Exchange indicates that around Lamto, in the subhumid savannah, the ecosystem behaves as a carbon sink similar to other West African ecosystems. On the other hand, there is no clear link between the NEE and temperature, radiative flux and precipitation. This lack of connection may suggest a limited response of the NEE interannual dynamics related to the changes in climatic features.

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Principaux indices de l’intensité du feu dans une savane Guinéenne d’Afrique de l’Ouest

Cited by 8 publications

References 22 publications

A Quantitative Index Based on Leaf Heteroblasty for Predicting Root Biomass in a Frequently Burned Savanna Species: Cussonia arborea Hochst. Ex A. Rich. (Araliaceae)

A Quantitative Index Based on Leaf Heteroblasty for Predicting Root Biomass in a Frequently Burned Savanna Species: Cussonia arborea Hochst. Ex A. Rich. (Araliaceae)

Analysis of the temporal variability of CO<sub>2</sub>, CH<sub>4</sub> and CO concentrations at Lamto, West Africa

Understanding the Local Carbon Fluxes Variations and Their Relationship to Climate Conditions in a Sub-Humid Savannah-Ecosystem during 2008-2015: Case of Lamto in Cote d’Ivoire

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