The distribution of vegetation in The distribution of vegetation in the United States, as related to climatic conditions distributionofv00livi Year: 1921 CLIMATIC CONDITIONS OF THE UNITED STATES. 245 Probably the most generally useful of our cbarts of the temperature conditions is the one for the length of the period of the average frostless season, and the five temperature provinces just mentioned are indicated on that chart (plate 34). In terms of that particular temperature index, the relation between our simple names and the index values is shown in table 9. For other temperature indices
The distribution of vegetation in The distribution of vegetation in the United States, as related to climatic conditions distributionofv00livi Year: 1921 CLIMATIC CONDITIONS OF THE UNITED STATES. 245 Probably the most generally useful of our cbarts of the temperature conditions is the one for the length of the period of the average frostless season, and the five temperature provinces just mentioned are indicated on that chart (plate 34). In terms of that particular temperature index, the relation between our simple names and the index values is shown in table 9. For other temperature indices the values would Table 9. Temperature prov- inces of temperate zone in United States. Length of period of average frostless season. Very cool days. Below 120 120 to 180 180 to 240 240 to 300 Above 300 Cool Medium Warm of course be entirely different, but the general zonation for these other indices may be generally comparable to that of plate 34, if proper limiting values are chosen. In the case of the temperature summation indices obtained by the physiological method (plate 40 and fig. 1), for example, the zones noted in table 10, roughly comparable to those Fig. 1.—Temperature zonation, according to physiological summations for period of ivvorace frostless season. Temperature efficiency provinces: very warm, more than 20; warm, to 20; medium, to ; cool, to ; uery cool, less than Numerical values represent thousands. (See also plate 40.)
Size: 1791px × 1117px
Photo credit: © Bookend / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
