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The ecoregion stretches across Africa from northern Senegal and Mauritania on the Atlantic coast to Sudan and Eritrea on the Red Sea. Commonly referred to as the ‘Sahel’—this ecoregion comprises a grassland-dominated transition zone between savanna woodlands to the south and the Sahara Desert to the north.
May 31, 2023 · The Sahel has a hot semi-arid climate and stretches across the southernmost latitudes of North Africa between the Atlantic Ocean and the Red Sea. Although geographically located in the tropics, the Sahel does not have a tropical climate.
One initiative to combat this is the planting of 1,250 hectares (3,090 acres) of Acacia senegal in the Malian locality of Nara, near Mauritania. The Malian agricultural firm Déguessi Vert is ...
The Sahelian Acacia Savanna stretches across Africa from northern Senegal and Mauritania on the Atlantic coast to Sudan on the Red Sea, varying in width from several hundred to over a thousand kilometers (km). The word "sahel" means shore in Arabic and refers to the transition zone between the wooded savannas of the south and the true Sahara ...
- Tropical Primary Herbaceous Ecosystems
- Organization of A Savanna
- Biodiversity and Conservation Issues
- Savanna Resilience
- Restoration of Tropical Herbaceous Ecosystems
- Afforestation
- Savannas & Climate Change: Contrasting Projections
- Messages to Remember
In Africa, in the sub-Saharan zone, in the greater East Africa region, in Central Africa and as far as South Africa (Figure 2) ;in South and Central America (Figure 3), mainly in the centre of the continent, in a region locally known as Cerrado, but also in Venezuela and Colombia where the savannas are known as Llanos. They...in northern Australia and southern New Guinea ;in Asia, especially in India and China, where they are less well known and cover smaller areas.2.1. Origin of savanna structure
While trees are often resistant* or resilient* to fire, species in the herbaceous stratum are generally shade intolerant . This coexistence is quite unusual. It is the interaction of several processes related to water use, soil properties and disturbance regimes* -such as fire- which is at the origin of the vegetation structure of these ecosystems ,: 1. The climate (quantity of rainfall and length of the rainy season, among other things), since a minimum amount of rainfall is needed to allow...
2.2. Fire, a major player in savanna ecosystems
The distribution of savannas cannot therefore be predicted by climate alone. Thus, disturbances such asherbivory (especially that of “mega-herbivores”, such as elephants and ungulates) and fire play a major ecological and evolutionary role in savannas,, (see Figures 2 to 5). In the herbaceous stratum, grasses are a major biofuel. Their presence favours fires, limiting the growth of trees and shrubs. The life cycle of grasses, and herbaceous species in general, is well adapted to fire: they ar...
Savannas represent an exceptional heritage. They are ecosystems extremely rich in biodiversity and particularly in endemic species. As an example, the Brazilian savanna called Cerrado, which extends over two million km², contains more than 12,000 plant species. It is the most species-rich savanna in the world (see Focus The Cerrado Biome). African ...
Although fires in savannas are originally natural (lightning during thunderstorms), fire regimes have long been influenced by human activities (at least 300,000 years in Africa). Human evolution is linked to an increase in burned areas . The substantial impact of human activities on fire regimes, however, seems to be more recent and may date back a...
A first step is to take into account the natural disturbances caused by fires and large herbivores. Savanna restoration techniques therefore include the reintroduction of natural disturbances such as the use of prescribed burns, grazing management, reintroduction of herbivores, but also the elimination of invasive species. In the case of major degr...
Another problem with the restoration of savannas is that they are often misregarded as degraded forests. Their biodiversity and the importance of the (ecosystem) services they provide to societies are not always perceived by the general public and decision-makers, including government entities that might implement conservation programmes. Often err...
Already greatly affected by anthropogenic land use changes, savannas are expected to be profoundly altered by climate change and rising CO2 concentrations in the atmosphere. Indeed, the extent of the savannas depends on the amount of precipitation and the seasonality of the climate. For the future, contrasting projections are given by the different...
Restoration of degraded forests, including replanting trees, is essential, but tree planting should not compromise the conservation and restoration of other ecosystems.Ecological restoration should restore degraded ecosystems, but not destroy natural ecosystems.Since the restoration of savannas remains difficult, environmental policies should give priority to their conservation.Valuing biodiversity and recognizing the ecosystem services that savannas provide is a first step to improve their conservation, in parallel with the management of natural areas. This implies the u...Feb 19, 2022 · Tropical Savanna. The tropical savanna is generally found in regions dominated by the Wet-Dry Tropical climate. An extensive cover of tall grasses, sometimes reaching a height of 3 meters, is found in the tropical savanna. Most savanna grass is coarse and grows in tufts with intervening patches of bare ground.
Jan 18, 2024 · Acacia Trees Beyond Africa. While acacia trees are most famously associated with the African savannah, they also thrive in other regions, particularly in arid and semi-arid areas. One notable example is the Australian Acacia, commonly known as wattle, which includes over 1,000 species.
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