Bioclimatology and Biogeography of Africa by Henry N. Houérou

By Henry N. Houérou

Masking a space of over one hundred thirty million km2 spanning the Mediterranean, equator and tropics, the African continent includes a brilliant geographic range. therefore, it really is characterized by way of super variable climatic, edaphic and ecological stipulations, linked to a variety of average plants and natural world, in addition to human inhabitants density, vegetation and farm animals. during this booklet, Henry Le Hou?rou provides his bioclimatic and biogeographic class of Africa. The huge information give you the foundation for comparisons among quite a few African areas, and with areas on different continents akin to Latin the US or the Indian subcontinent. the consequences represent a rational foundation for nationwide, nearby and sub-regional rural improvement making plans, and for agricultural study facing features reminiscent of plant and animal introductions, the extrapolation or interpolation of experimental or developmental findings, and ecosystems dynamics. attainable difficulties of functions also are tested.

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Equatorial) with double monsoon-season (NE and SW) rainfall regimes. In the extra-tropical zones, the distribution is more complex; it may be either weakly monomodal or bimodal. The impact of latitude on the temperature and rainfall regimes is shown in Figs. 46–48, taken from Aubréville (1949) and De Martonne (1927a, b). 1 Annual Amount Africa has both the absolute lowest and third highest record of mean annual rainfall recorded on the planet. The Sahara is circumscribed by the isohyet of 100 mm of annual rainfall (Tables T6, T23, Figs.

1988; Janicot 1990; Fontaine 1991; Fontaine and Bigot 1991; Mahé 1993; Janicot and Fontaine 1993; Mahé et al. 1993). There seems to be a Southern Atlantic Oscillation (SAO) comparable to the Pacific ENSO. 3 Classification Criteria 41 2500 2250 Annual Rainfall (mm) 2000 1750 1500 1250 1000 750 500 250 0 0 30 60 90 120 150 180 210 240 270 300 330 360 390 Length of the rainy period (days) Fig. 35 ETo) in African tropical agro-bioclimates (Le Houérou et al. 0093 140 120 100 80 60 40 20 0 0 30 60 90 240 270 120 150 180 210 Length of the rainy period (days) 300 330 360 390 Fig.

Western African semi-arid and arid zones are under a monomodal rainfall distribution pattern, rangelands are largely made up of annual grasses, whereas in East Africa under a bimodal regime, rangelands in fair condition are dominated by perennial grasses. This bears overriding 0°N 30°N 10°W 50 50 Ad Cb 5mm Tropic Ba 25 Hb 25 Bb Bb Ha 50 m Bb Sh cancer of 5m 25 Bb Sh Cc Cd + Ho 50 + Bc 50 Ba _ Western Bb _ Central Bc _ Eastern 0 200 400 600 8001000 km Ce 100 C = Southern Sahara Summer rains, P > 25mm C0 _ Oceanic Ca _ Western Cb _ Western Cc _ Central Cd _ Central Ce _ Eastern Cf _ Eastern S N S N S N Fig.

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