Ecosystem services from woody vegetation on agricultural lands in Sudano-Sahelian West Africa

Sinare, Hanna; Gordon, Line

doi:10.1016/j.agee.2014.11.009

Cited by 97 publications

(67 citation statements)

References 82 publications

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“…Secondly, the allometric equation used for estimating AGB from crown area was developed for Vitellaria paradoxa and may therefore not be optimal for other tree species. The relationship between crown area and AGB is also complicated due to the pollarding of trees, which is a common practice in the region [92,93].…”

Section: Discussionmentioning

confidence: 99%

Mapping Tree Canopy Cover and Aboveground Biomass in Sudano-Sahelian Woodlands Using Landsat 8 and Random Forest

et al. 2015

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Accurate and timely maps of tree cover attributes are important tools for environmental research and natural resource management. We evaluate the utility of Landsat 8 for mapping tree canopy cover (TCC) and aboveground biomass (AGB) in a woodland landscape in Burkina Faso. Field data and WorldView-2 imagery were used to assemble the reference dataset. Spectral, texture, and phenology predictor variables were extracted from Landsat 8 imagery and used as input to Random Forest (RF) models. RF models based on multi-temporal and single date imagery were compared to determine the influence of phenology predictor variables. The effect of reducing the number of predictor variables on the RF predictions was also investigated. The model error was assessed using 10-fold cross ). This mapping approach is based on freely available Landsat 8 data and relatively simple analytical methods, and is therefore applicable in woodland areas where sufficient reference data are available.

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Section: Discussionmentioning

confidence: 99%

Mapping Tree Canopy Cover and Aboveground Biomass in Sudano-Sahelian Woodlands Using Landsat 8 and Random Forest

et al. 2015

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“…Provisioning ecosystem services from vegetation were reported in 74 of the reviewed articles. Nutritional diversity is the most studied category, addressed in 56 studies in total for all species, followed by medicinal uses (40 studies) (Sinare & Gordon, 2015). In addition, herbal medicines are known to have a strong reputation throughout history and within every culture to provide first-line and basic health services for patients with numerous disease conditions (Quimby, 2007).…”

Section: Introductionmentioning

confidence: 99%

Phytochemical composition and antioxidant activity of extracts of some medicinal plants in Tunisia

Athmouni¹,

Belghith²,

Fek³

et al. 2016

IJPT

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The aim of this study was to investigate the chemical composition of the best known plants biomarkers from the locality of Gafsa (Tunisia). Majority of investigated plants had high levels of phenolics and exhibited noteworthy antioxidant activity. The plants showing the highest antioxidant activities were P. angustifolia, T. garganica, G. alypum and L. multifida. P. angustifolia demonstrated by far the most potent antioxidant activity, as well as total phenolic and total flavonoids content. In flavonoid structure of the aerial parts of the related species, different amounts of rutin, myricetin, morin, quercetin and kaempferol together with ergosterol, stigma sterol and b-sitosterol as phytosterols, vitamin D, vitamin K, a-tocopherol and retinol as vitamins, and arabinose, fructose, glucose, sucrose and maltose as sugars were found. The mineral analysis was related to the existence of Ca, Na, K, Fe, Mn, Zn and Mg with different amounts in all of the nine tested species.

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“…Other tree species, such as Mangifera indica, are planted in the agricultural fields. Parkland trees are important sources of wood fuel, construction material, food, fodder and medicinal products (Boffa 1999, Manning, Gibbons, andLindenmayer 2009), and provide for a number of ecosystem services (Sinare and Gordon 2015), such as soil fertilization (Gnankambary et al 2008), and water conservation, including improved groundwater recharge (Ilstedt et al 2007, Bargués Tobella et al 2014. On the global level, agroforestry is increasingly being recognized as a sensible land-use strategy to both mitigate and adapt to climate change (Lykke et al 2009).…”

Section: Land Use and Agroforestry Parklandsmentioning

confidence: 99%

Remote Sensing of Woodland Structure and Composition in the Sudano-Sahelian zone : Application of WorldView-2 and Landsat 8

Karlson¹

2015

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Woodlands constitute the subsistence base of the majority of people in the Sudano-Sahelian zone (SSZ). Trees and grasses provide key ecosystem goods and services, including soil protection, fuelwood, food products and fodder. However, climate change in combination with rapidly increasing populations and altered land use practices put increasing pressure on the vegetation cover in this region. Low availability of in situ data on vegetation structure and composition hampers research and monitoring of this essential resource. Satellite and aerial remote sensing represents important alternative data sources in this context. The main advantages of remote sensing are that information can be collected with high frequency over large geographical areas at relatively low costs. This thesis explores the utility of remote sensing for mapping and analysing vegetation, primarily trees, in the SSZ. A comprehensive literature review was first conducted to describe how the application of remote sensing for analysing vegetation has developed in the SSZ between 1975 and 2014, and to identify important research gaps. Based on the gaps identified in the literature review, the capabilities of two new satellite sensors (WorldView-2 and Landsat 8) for mapping woodland structure and composition were tested in an agroforestry landscape located in central Burkina Faso. The tree attributes in focus included tree crown area (m 2 ), tree species, tree canopy cover (%) and aboveground biomass (tons ha -1 ). The data processing methods encompassed objectbased image analysis for tree crown delineation, and use of the Random Forest algorithm for tree species classification (WorldView-2) and estimation of tree canopy cover and aboveground biomass (Landsat 8).The literature review revealed that the use of remote sensing has increased extensively in the SSZ, especially since 2010. Remote sensing is increasingly used by diverse scientific disciplines although the contribution from African authors remains relatively low. The main application area has been to analyze changes in vegetation productivity and broad vegetation types, while relatively few studies have used remote sensing to map tree attributes at a higher level of detail, and to analyze interactions between the vegetation cover and environmental factors.This thesis shows that the WorldView-2 satellite represents a useful data source for mapping individual tree attributes, including tree crown area and tree species. The individual tree crown delineation achieved promising results: 85.4% of the reference trees were detected in the WorldView-2 data and tree crown area was estimated with an average error of 45.6%. Both detection and delineation accuracy was influenced by tree size, the degree of crown closure and the composition of the undergrowth vegetation. In addition, WorldView-2 data produced high classification accuracies for five locally important tree species, which are common throughout the SSZ. The highest overall classification accuracy (82.4%) was produced using multi-tempor...

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Ecosystem services from woody vegetation on agricultural lands in Sudano-Sahelian West Africa

Cited by 97 publications

References 82 publications

Mapping Tree Canopy Cover and Aboveground Biomass in Sudano-Sahelian Woodlands Using Landsat 8 and Random Forest

Mapping Tree Canopy Cover and Aboveground Biomass in Sudano-Sahelian Woodlands Using Landsat 8 and Random Forest

Phytochemical composition and antioxidant activity of extracts of some medicinal plants in Tunisia

Remote Sensing of Woodland Structure and Composition in the Sudano-Sahelian zone : Application of WorldView-2 and Landsat 8

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