The middle Yame Valley in the Dogon Country (Mali) is located in the Sahelo-Sudanian zone on the Plateau of Bandiagara. The current landscapes are park-savannas revealing of old and close relations ...between practices, culture, and traditions of the Dogon people and their natural environment. They are the results from both ancient and modern heritage. Recent socio-economic changes, especially a gradual intensification of agriculture, leading to changes in the physiognomy of the landscape. The question of their cultural and patrimonial significance and their management is discussed.
La moyenne vallée du Yamé, en Pays dogon (Mali) est située en zone soudano-sahélienne sur le Plateau de Bandiagara. Les paysages actuels correspondent à des savanes-parcs arborées, manifestation des relations entre les pratiques et la culture des populations dogon et leur environnement naturel. Ils résultent d'héritages à la fois anciens et récents. Les changements socio-économiques, en particulier une intensification progressive de l'agriculture, entraînent des modifications importantes de la physionomie des paysages. La question de leur valeur patrimoniale et de leur gestion est posée.
Provider: - Institution: - Data provided by Europeana Collections- Novo conflito entre homens armados, alegadamente da RENAMO, e as forças do Governo na última madrugada. O palco foi novamente o ...centro do país. Há mortos e feridos, todos do lado do Governo. Linha de Sena foi fechada.- New conflict between armed men, allegedly RENAMO, and government forces in the last dawn. The stage was again the center of the country. There are dead and wounded, all on the Government side. Seine Line was closed.- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
African grasses are becoming major invaders of crop fields, degraded rangelands, and natural reserves of the Brazilian savannas (the cerrado). One of the main hypotheses proposed to explain the ...successful spread of these species suggests that they are more grazing tolerant than native grass species. To test this premise I compared African and native grasses for tillering and size change responses after clipping. It was hypothesized that African species would tiller more but be shorter after clipping than native species. Four African and five native grasses were clipped in the field at three different periods: early wet season, late wet season, and dry season. Control plants were not clipped. Plant height and number of tillers were measured. Plant base circumference was also measured in the caespitose species to determine whether or not species were spreading laterally as a result of tillering. Comparisons between control and clipped plants were made one month after clipping. Control and early wet-season clipped plants were also followed for one year. Defoliation decreased plant height in all species; tillering increased only in plants of the African species clipped during the late wet season; and plant base circumference did not increase in any caespitose species. There is evidence that only in the African species Hyparrhenia rufa did the circumference of the base increase as a consequence of tillering. A time trend analysis revealed that plant height of both African and native species was affected by both clipping and time and that plant base circumference was affected by clipping only in H. rufa. The trend analysis also showed that tillering was not stimulated by clipping in any of the species and that tillering was more a function of time than treatment. Clipping significantly reduced tillering in the African species Melinis minutiflora. It is concluded that tillering is not necessarily a response by grasses to defoliation, and that the invasion of cerrado by African grasses is not the consequence of the higher grazing tolerance of the invading species.
This paper examines the contrasting responses to short- and long-term droughts shown by cattle populations in two different savanna ecosystems in a communal area in southern Zimbabwe. It illustrates ...how ecological responses are modified by differential management inputs-herding, transhumant movement, and supplementary feeding. The impacts of drought on cattle herds can thus be understood only with insight into this interaction of ecological and socio-economic factors. Such detailed study of drought response can most effectively inform development planning.
