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close this bookAbstracts on Sustainable Agriculture (GTZ, 1992, 423 p.)
close this folderAbstracts on agroforestry
View the documentAcknowledgements
View the document1. Tree products in agroecosystems: economic and policy issues.
View the document2. Sustainable use of plantation forestry in the lowland tropics.
View the document3. The palcazu project: forest management and native yanesha communities.
View the document4. Opportunities and constraints for sustainable tropical forestry: lessons from the plan piloto forestal, quintana roo, Mexico.
View the document5. The taungya system in south-west Ghana.
View the document6. Planning for agroforestry.
View the document7. Sowing forests from the air.
View the document8. Agroforestry pathways: land tenure, shifting cultivation and sustainable agriculture.
View the document9. Food, coffee and casuarina: an agroforestry system from the Papua New Guinea highlands.
View the document10. Agroforestry in africa's humid tropics - three success stories.
View the document11. Agroforestry and biomass energy/fuelwood production.
View the document12. Regeneration of woody legumes in Sahel.
View the document13. Medicines from the forest.
View the document14. Potential for protein production from tree and shrub legumes.
View the document15. Agroforestry for sustainable production; economic implications.
View the document16. Living fences. A close-up look at an agroforestry technology.
View the document17. Homestead agroforestry in Bangladesh.
View the document18. Guidelines for training in rapid appraisal for agroforestry research and extension.
View the document19. Erythrina (leguminosae: papilionoideae): a versatile genus for agroforestry systems in the tropics.

12. Regeneration of woody legumes in Sahel.

Publ. of Botanical Institute, Aarhus, University in cooperation with DANIDA Forest Seed Centre, Denmark; ISBN 87-87600-35-8, 1991, 90 pp.

Woody legumes are a major feature of the semi-arid vegetation zones of West Africa and are very important economically in the region, but there is little published information on their natural regeneration. In this short book, Mr. Tybirk gives an overview of the regeneration strategies of 36 species found in West Africa's Sahelian and dry Sudanian zones.

Most of the legumes covered are indigenous, but the author also includes a few exotic species.

He discusses in separate chapters four phases in the natural-regeneration process - seed dispersal, seed predation, germination of hard-seeded plants, and growth of young seedlings. Based on the morphology of the diaspore, personal observations and the literature, he suggests that about 50% of the species covered are dispersed primarily by wind (hemi-legumes or samaras), nearly all species are dispersed either primarily or secondarily by passage through animals (most by ungulates and a few also by birds and/or primates), and a few species are secondarily dispersed by water.

The chapter on seed predation focuses mainly on predation by the beetle family Bruchidae, which has a major ecological and economic impact on woody legumes in the region. Lists of host-predator associations, host-predator-parasite associations, and seed-predation percentages are compiled from the literature.

The chapter on seed germination presents a general description of seed characteristics, dormancy-control mechanisms, seed banks in the soil, the germination process, and environmental factors affecting germination in the region. The chapter on seedling growth describes seedling development, vegetative regeneration, and environmental factors influencing growth.

The author emphasizes throughout the text that successful natural regeneration depends on complex ecological interactions involving dispersal, predation, germination, timing, grazing, fire, drought, soil type and other factors. He illustrates this complexity with many examples, some of which have important implications for ecosystem management. In the last two chapters, he discusses some general implications for long-term management and sustainable use of woody legumes in the region and provides a useful summary of regeneration characteristics for each species.

This book is a valuable contribution to our understanding of the natural regeneration of woody legumes in the Sahel. It should also stimulate further research in this important area.

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Agroforestry

Developing countries, review, medicine, medical drugs, plant screening, forests, future strategies

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