By Chelston W. D Brathwaite
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Extra resources for An Introduction to the Diagnosis of Plant Disease
In wooded savannas, fire strongly influences vegetation structure. In most wooded savannas, woody plants grow in clusters, surrounded by grasslands. The origin of such a distribution may be the occurrene of fires where grasses dominate, limiting the establishment of woody plants (Menaut 1983). The influence of fire lessens as the rainy and dry seasons become less pronounced. 4. In the Sudan zones, adequate rain falls on termite mounds to wet them thoroughly, so vegetation can benefit from the nutrients available on the mounds.
3 The Sahel Zones From north to south in the Sahel zones, rainfall increases and open shrub savanna gives way to open tree savanna (Figs. 7). The groundwater table usually lies below the reach of tree roots. 3 An Ecological Interpretation of Woody Vegetation in the SSWA 29 average annual rainfall (mm) 1400 \ dry woodland \ \ \ ~_~ I \ 1 \ 1200 \ I \ tree savanna \ -_ \ (perennial herbs mainly) 1 --- j \ 800 \ ~ -, __ 0 \ j -'" c:! \ -- 0 400 IJ-- annual herbs VI \ ~ ~ l: g \ a. \ \ I""a Ie;> > '-0 --' \ -g \ I \ \ 1 1 \ \ \ c: \ \ \, \ I c: --"_' \ 200 \ c: " \ \ 600 \ I I I \ 1000 swamps (rice) I \ \ 'c - - __ II c: <1> '):;; \ a.
Soft leaves are generally shed at the beginning of the dry season (Men aut 1983). During recent years, a greater proportion of woody species with xerophytic adaptationa have been observed (Le Houerou 1989). , Dichrostachys glomerata) , of ephedroid species (Leptadenia pyrotechnica, Capparis decidua), and of evergreen mesophyllous, sclerophyllous species (Balanites aegyptiaca, Boscia senegalensis) , although within populations of these species large scale mortality occurred. , Pterocarpus lucens, Anogeissus leiocarpus and the Combretaceae.
An Introduction to the Diagnosis of Plant Disease by Chelston W. D Brathwaite