Climatic classifications are generally useful where soil conditions are relatively uniform. A number of climatic classifications have been developed. Holdridge's Life-Zone system of classification (Holdridge 1967) is one of the most generalized and used to classify tropical forests. The system classifies vegetation on a global scale, according to latitudinal regions and altitudinal belts based on biotemperature (the average annual temperature using values only between 0 and 30 °C, the range within which photosynthesis has a net positive value). Each of the temperature regions contains a series of Humidity Provinces, ranging from semi-parched (where the ratio of potential evapotranspiration to rainfall is greater than 32), through humid (where potential evapotranspiration and rainfall are equal) to saturated (a theoretical situation
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