. The distribution of vegetation in the United States, as related to climatic conditions. Phytogeography. CLIMATIC CONDITIONS OF THE UNITED STATES. 375 C. MOISTURE-TEMPERATURE INDICES (P/EXT) BASED ON TEMPERATURE SUMMATION-INDICES OBTAINED BY THE EXPONENTIAL METHOD (TEM- PERATURE COEFFICIENT OF ), FOR THE PERIOD OF THE AVERAGE FROSTLESS SEASON. (TABLE 22, PLATE 71.) The same values for P/E are used here as in the preceding case, but the temperature indices are taken from table 7, column 2. The products are presented in the third column of table 22. They are shown graphically on the chart of
. The distribution of vegetation in the United States, as related to climatic conditions. Phytogeography. CLIMATIC CONDITIONS OF THE UNITED STATES. 375 C. MOISTURE-TEMPERATURE INDICES (P/EXT) BASED ON TEMPERATURE SUMMATION-INDICES OBTAINED BY THE EXPONENTIAL METHOD (TEM- PERATURE COEFFICIENT OF ), FOR THE PERIOD OF THE AVERAGE FROSTLESS SEASON. (TABLE 22, PLATE 71.) The same values for P/E are used here as in the preceding case, but the temperature indices are taken from table 7, column 2. The products are presented in the third column of table 22. They are shown graphically on the chart of plate 71, the discussion of which will be postponed until the next following chart has been presented. D. MOISTURE-TEMPERATURE INDICES BASED ON TEMPERATURE SUMMA- TION-INDICES OBTAINED BY THE PHYSIOLOGICAL METHOD (LIVINGS- TON'S, 1916) INDICES FROM LEBENBAUER'S 1915 MEASUREMENTS FOR YOUNG MAIZE SHOOTS, FOR THE PERIOD OF THE AVERAGE FROSTLESS SEASON. (TABLE 22, PLATE 72, AND FIG. 18.) The values for P/E are the same here as in the two preceding cases, but the temperature indices are taken from table 7, column 4. The products are given in the fourth column of table 22, and the chart therefor is shown as plate 72. The discussion for plates 70, 71, and 72 will now be given. E. CONCLUSIONS FROM THE STUDY OF THE THREE FORMS OF MOISTURE- TEMPERATURE PRODUCTS. (FIG. 18.) The direction of zonation on all three of these moisture-temperature charts is at once seen to be essentially the same. A glance at the data. Fig. 18.—Moisture-temperature zonation, according to moisturo-tomporaturo products: (physio- logical method) for period of average frostlcss season. Moisture-temperature provinces: Very hioh, more than 13; high, 7 to 13; medium, 4 to 7; loir, 1 to 4; very low, less than 1. Nu- merical values represent thousands. (See also Plate 72.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appea
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphytoge, bookyear1921
