. Fig. 16.—Moisture zonation, according to precipitation-evaporation ratio (period of average frostless season). Moisture provinces: Humid, more than 100; semihumid, 60 to 100; semi- arid, 20 to 60; arid, less than 20. (See also Plate 57.) that we have here a cHmatic index by means of which the zonation of the country with regard to moisture conditions may be clearly shown. As will receive emphasis later, the climatic zonation thus brought out is closely paralleled by certain prominent features of the zonation of vegetation types, and there is httle room to doubt that this division of the coun
. Fig. 16.—Moisture zonation, according to precipitation-evaporation ratio (period of average frostless season). Moisture provinces: Humid, more than 100; semihumid, 60 to 100; semi- arid, 20 to 60; arid, less than 20. (See also Plate 57.) that we have here a cHmatic index by means of which the zonation of the country with regard to moisture conditions may be clearly shown. As will receive emphasis later, the climatic zonation thus brought out is closely paralleled by certain prominent features of the zonation of vegetation types, and there is httle room to doubt that this division of the country into moisture-ratio provinces will be of very great value in the study of climatology with reference to agriculture and forestry.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphytoge, bookyear1921
