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By B. Stonehouse

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By B. Stonehouse

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Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. 4 t 1 millibar = KMX) d y n e s per c m - . M e a s u r e m e n t s taken during a dry spell on 6—7 January. 1%7 in tropical lowland forest at the Ankasa Forest R e s e r v e , G h a n a . whole year; however under more open forms of land use, such as cultivation and regenerating bush, drying out was rapid to considerable depths soon after the onset of the dry season (McCulloch, 1962; papers in Pereira, 1962). The effects of atmospheric temperature changes are also mediated through the spatial structure of the vegetation, as are the effects of wind which may also be of importance to moisture stress and plant response, especially, but perhaps not exclusively, in the more arid areas of the tropics.

Savanna parkland woodlands and shrubs, with a discontinuous canopy, usually with individual trees discretely located; the ground layer is more or less continuous and displays marked seasonality, consisting of grasses and herbs, with some low shrubs; 2. Open savanna cultivation tends to reduce the number of trees, and the fallow succession consists entirely of grasses, herbs and some low shrubs; tree regeneration is slow or absent; fire is a significant factor in the 3. Thorn scrub ecology Relatively rich in tree species though sometimes dominated by one or two; trees frequent and a significant element in the community; ground layer continuous and relatively rich in species, though often dominated by one or two Ground layer dominant with only a few isolated trees; ground layer very variable in response to a complex of ecological factors; tree species often dominated by taxa of use to man, or of no use, even as fuel Very open canopy or isolated trees, usually Acacia spp; discontinuous ground layer with much bare soil; ephemeral spp of importance in some areas; in semiarid regions Lowland or steppe IV Herband Exclusively dominated grassland grasslands by low plants, chiefly herbs and grasses; some communities are grassy, others herbaceous; within the graminaceous and the herbaceous types, different species and species combinations produce widely differing heights 2.

1965). Laboratory measurement of hydraulic conductivity of saturated soil. In Methods of Soil Analysis, Pt. 1. Ed. C. A. Black. Wisconsin, USA; American Society of Agronomy Inc. BALFOUR, Ε. B. V. I. Stewart and R. Ο. Salih 37 (1976). The Agricultural Climate of England and Wales. Ministry of Agriculture, Fisheries and Food. London; HMSO M C E W E N , F. L. and S T E P H E N S O N , G . R. (1979). The Use and Significance of Pesticides and the Environment. Chichester; Wiley R O W S E , H . R . and B A R N E S , A .

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