. Bulletin. Forests and forestry -- United States. 70 FOREST INFLUENCES. the coustautly cooling mean temperature. These features may be in part due to tlie soil. Otherwise the diagram resembles the correspond- ing one of the preceding section. Fig. 41 gives the two forest tem-. Pio. 40.â temperature, dittereneus at Erineuouville, iiudir iiines. Soil: coarse, bare saiid. perature diagrams above trees from M. Fautrat's observations. The line for mean temperature is omitted because of the narrowness of the space. It would, in each case, hug the zero line. It is interesting to + 1° DECIDUO
. Bulletin. Forests and forestry -- United States. 70 FOREST INFLUENCES. the coustautly cooling mean temperature. These features may be in part due to tlie soil. Otherwise the diagram resembles the correspond- ing one of the preceding section. Fig. 41 gives the two forest tem-. Pio. 40.â temperature, dittereneus at Erineuouville, iiudir iiines. Soil: coarse, bare saiid. perature diagrams above trees from M. Fautrat's observations. The line for mean temperature is omitted because of the narrowness of the space. It would, in each case, hug the zero line. It is interesting to + 1° DECIDUOUS TREES. 0 ^,__ â . _ . "~^ â â rr.^rr *^, â â - EVERGREEN TREES. + r 0 ^^^'' ââ__ â â- -^"' ~ V. ^ ^^,^' ^^â¢Â«Â«.,^ â -1° â ,..--' ""^ -2° '**' WINTER. SPRING. SUMMER. AUTUMN. MINIMA. .MEAN. MAXIMA. Fig. 41.âForest temperature, ditiereiices above treesâfrom Fautrat's observations. note how the temperature diagram, iu Fig. 41, has here contracted. That for trees, with the instruments close to thetoj>s, is very narrow, while that fo^ deciduous trees, instrument about 20 feet above + S^ _J '^^ + 4° /' ââ -^ "-^ 4-3° / / N '.^"""^ .^ *\_ "^S^ \ + 2° /- â â-^â " "^^ â ^^ / / --"' + r ^:::^- ^ ^.. y' ^\ "â â 0 --'â ' "â-*" WINTER. SPRING. SUMMER. AUTUMN. EVERGREEN AVERAGE OF BOTH. DECIDUOUS TREES. Fit). 42.âVertical f iiiiperatiire â¢gradients finm (ibscrvations above trees. the tops, has contracted so as to vanish at times. It is evident that if the instruments had been put a few feet higher up it would have en- tirely disappeared. Fig. 4"J represents the vertical gradients from Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Div
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