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| | II. Humid tropics |
 | | Humid tropics are the climatic regions where mean monthly temperatures are consistently high and exceed 18°C throughout the year, and where rainfall exceeds evapotranspiration for at least 270 days in a year (Salati et al., 1983; CGIAR, 1990a; Lugo and Brown, 1991). |
 | | The most predominant vegetation of the humid tropics consists of TRF in the lowlands, moist deciduous forest in regions with a pronounced dry season, and montane forest in the high lands (Holdridge, 1967). |
 | | In the humid tropics of Africa and America and parts of southeast Asia, traditional systems are based on shifting cultivation and bush fallow rotation (Okigbo and Greenland, 1976; Ruthenberg, 1980), on extractive use of native forest (Fearniside, 1983; Asabere, 1987), or on traditional agroforestry systems (Denevan et al., 1984; Gomez-Pompct, 1987a, b). |
| www.unu.edu /unupress/unupbooks/uu27se/uu27se04.htm (2953 words) |
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