. Bulletin. Forests and forestry -- United States. DIFFERENCES OF SOIL TEMPERATURE. 49 made some studies of the ettects on soil temperatures of vegetation at different heights and has found that on the whole they increase with the height. That the forest litter plays an important part in the matter of soil temperature can not be doubted, but no details are given on this point in the publisjied reports of the forest meteorological services. Numer- ous experimental observations have, however, been taken by â At surface. â AtG inches below surface. â At ifcct below surface. Fig. 0.âDiflferen
. Bulletin. Forests and forestry -- United States. DIFFERENCES OF SOIL TEMPERATURE. 49 made some studies of the ettects on soil temperatures of vegetation at different heights and has found that on the whole they increase with the height. That the forest litter plays an important part in the matter of soil temperature can not be doubted, but no details are given on this point in the publisjied reports of the forest meteorological services. Numer- ous experimental observations have, however, been taken by â At surface. â AtG inches below surface. â At ifcct below surface. Fig. 0.âDiflferencea of temperature for young trees, Liutzel Station, -woods and open fields ( WâO). Wollny, the results of which are graphically exhibited in Fig. 7. The unbroiven curve is here the result of several years' observation; the broken ones represent shorter series, made to test the eftects in indi- vidual soils. The comparison is always made with bare soil, and the positive sign here means a higher tem])erature in the covered soil. The general trend of the curves is strikingly like that in forests. + 1° ^ ^ - 0 "^ \ y â / - 1° \ V - â¢.. > '-"' y / -2" \ V -''^'â ec(pu'iel. The trend of the curves is quite unlike that of tlu' 'J'he .sod is n^latively warm- est in autumn ami coldest in s])ring, and (he mean is in favor of warmer 12i4iâNo. 7 i. 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. Division of Forestry. Washington : G. P. O.
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