Problématique des plantes envahissantes au sud du Togo (Afrique de l’Ouest): apport de l’analyse systémique paysagère et de la télédétection

Akodewou, Amah; Oszwald, Johan; Akpavi, Sêmihinva; Gazull, Laurent; Akpagana, Koffi; Gond, Valéry

doi:10.25518/1780-4507.17750

Cited by 8 publications

(7 citation statements)

References 27 publications

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“…Increasing productivity was characteristic of some landscape patterns of the study area in the present work, whereas in other areas this has shown decreasing associations with levels of stress [6]. Such dynamics may occur due to seasonality, the passage of time, climatic conditions, different land use patterns, invasive species, wildfire, and pests [63,64].…”

Section: Discussionmentioning

confidence: 68%

Geo-Based Assessment of Vegetation Health Related to Agroecological Practices in the Southeast of Togo

et al. 2023

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In the context of climate change, the need to contribute to achieving Sustainable Development Goal (SDG) 2 is no longer in doubt, especially in sub-Saharan Africa. In this study of the landscape within 10 km of the Donomadé model farm, southeastern Togo, researchers sought to assess vegetation health in ecosystems and agrosystems, including their capacity to produce biomass for agroecological practices. Sentinel-2 sensor data from 2015, 2017, 2020, and 2022 were preprocessed and used to calculate the normalized vegetation fire ratio index (NBR), the vegetation fire severity index (dNBR), and CASA-SEBAL models. From these different analyses, it was found that vegetation stress increased across the landscape depending on the year of the time series. The research estimated that 9952.215 ha, 10,397.43 ha, and 9854.90 ha were highly stressed in 2015, 2017, and 2020, respectively. Analysis of the level of interannual severity revealed the existence of highly photosynthetic areas that had experienced stress. These areas, which were likely to have been subjected to agricultural practices, were estimated to be 8704.871 ha (dNBR2017–2015), 8253.17 ha (dNBR2020–2017), and 7513.93 ha (dNBR2022–2020). In 2022, the total available biomass estimated by remote sensing was 3,741,715 ± 119.26 kgC/ha/y. The annual average was 3401.55 ± 119.26 kgC/ha/y. In contrast, the total area of healthy vegetation was estimated to be 4594.43 ha, 4301.30 ha, and 4320.85 ha, in 2015, 2017, and 2022, respectively. The acceptance threshold of the net primary productivity (NPP) of the study area was 96%. The coefficient of skewness (0.81 ± 0.073) indicated a mosaic landscape. Productive and functional ecosystem components were present, but these were highly dispersed. These findings suggest a great opportunity to promote agroecological practices. Mulching may be an excellent technique for enhancing overall ecosystem services as targeted by the SDGs, by means of reconversion of plant biomass consumed by vegetation fires or slash-and-burn agricultural practices.

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Section: Discussionmentioning

confidence: 68%

Geo-Based Assessment of Vegetation Health Related to Agroecological Practices in the Southeast of Togo

et al. 2023

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“…Protecting ecosystems from invasive alien species is a crucial global environmental issue (Akodewou et al,2019). Invasive alien species are living organisms that originate from a geographical region other than the one to which they are introduced, and which have the capacity to establish and spread aggressively in their new environment (Zachariades et al, 2002).…”

Section: Mesosphaerum Suaveolensmentioning

confidence: 99%

“…This preference for disturbed areas is largely attributed to their ability to spread rapidly via light seeds and adapt to variable conditions (Goodal & Erasmus, 1996). Land use has a signi cant impact on the distribution of these invasive plants (Akodewou et al, 2019). For example, the conversion of forest land to farmland creates ideal conditions for the spread of Chromolaena odorata due to deforestation and soil disturbance.…”

Section: Mesosphaerum Suaveolensmentioning

confidence: 99%

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Effect of Land Use Dynamics on the Distribution of Chromolaena Odorata (Asteraceae) and Mesosphaerum Suaveolens (Lamiaceae), Two Invasive Alien Species in Benin, West Africa

AÏKPON,

GANGLO

2024

Preprint

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Invasive plants are now a major threat to biodiversity, agriculture and natural habitats around the world. It is now increasingly recognized that land uses are linked to invasion processes. Despite the various mutations and land cover changes observed in Benin, the expansion of invasive alien species in relation to land uses is poorly documented. This study, through systemic analysis and remote sensing, aims to investigate the link between land uses and the spread of Chromolaena odorata and Mesosphaerum suaveolens, two dominant invasive alien species in Benin, West Africa. This study sheds light on the structure of the different land cover classes and establishes the link between the distribution of invasive alien plants and the dynamics of land use in the study environment. A mapping of land use by object-oriented approach, a typology of landscape elements by a systemic analysis and verification on the ground were carried out. We noted that agricultural practices and the exploitation of natural resources are the main drivers of land use. Several land use units have been identified. It appeared that mosaics of crops and fallow land are the most dominated by invasive plants, followed by open forest, wooded and shrubby savannahs. The study also revealed that the degree of invasion is linked to antropic disturbance. This suggests that managed land should be reforested, and that heavy thinning in forests and savannahs should be avoided.

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“…Declining soil fertility is a consequence of the overexploitation of land, which is driven by a growing population and the prevalence of inappropriate practices (e.g., slash and burn, short fallow periods and the preference for monocropping systems) [2][3][4]. Land degradation and population growth in sub-Saharan Africa have also led to farmland encroaching on forests [5,6]. To overcome this decline in crop productivity, water-soluble mineral fertilisers and synthetic pesticides are increasingly being used.…”

Section: Introductionmentioning

confidence: 99%

Is Mulching a Cost-Effective System? Case Study of Pineapple Cropping Systems of the Donomadè Ecovillage in Yoto Prefecture in Togo, West Africa

Atakpama,

Pereki,

Folega

et al. 2023

Preprint

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One of the main constraints of agriculture in sub-Saharan Africa is the steady decline in the level of soil fertility resulting in a continuous decline in crop yields. This study assessed the impact of grass mulch on: the productivity, the income, the soil carbon, and the phytodiversity within three pineapple-based systems of the ecovillage of Donomade in Togo. They are: a model farm with mulch, adopters’ farms, and non-adopters. Production-related data (e.g., number of plants, the number of productive individuals, the mass of products harvested) was obtained by a sampling an area of 100 m². These measurements were coupled with a semi-structured individual’s interviews of producers on the history of the plots and production costs in order to assess their profitability. The fruit production was three times higher within the adopters’ plots (21240 ± 11890 kg/ha) than the non-adopters (7840 ± 7890 kg/ha) and the two thirds of the model farm (33838 ± 9460 kg/ha). Consequently, the net income was 8 to 11 times higher than the conventional pineapple cropping system. According to the cropping systems, the total soil carbon was higher within mulching plots including the model farm and the adopters’ plots and lower within the non-adopters’ plots.

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Problématique des plantes envahissantes au sud du Togo (Afrique de l’Ouest): apport de l’analyse systémique paysagère et de la télédétection

Cited by 8 publications

References 27 publications

Geo-Based Assessment of Vegetation Health Related to Agroecological Practices in the Southeast of Togo

Geo-Based Assessment of Vegetation Health Related to Agroecological Practices in the Southeast of Togo

Effect of Land Use Dynamics on the Distribution of Chromolaena Odorata (Asteraceae) and Mesosphaerum Suaveolens (Lamiaceae), Two Invasive Alien Species in Benin, West Africa

Is Mulching a Cost-Effective System? Case Study of Pineapple Cropping Systems of the Donomadè Ecovillage in Yoto Prefecture in Togo, West Africa

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