. Plant habits and habitats in the arid portions of South Australia. Plant ecology; Botany; Desert plants. 28 PLANT HABITS AND HABITATS IN THE In the preceding summary of temperature differences characteristic of different depths of soil, actual temperatures only were considered; but another point of view, which is instructive, can be held by a summa- tion or integration of the temperatures, month by month, for different depths. Reference is here made to a depth of 15 cm. and 30 cm. and, in addition, that of meters is included for comparison. As a whole, it appears that there is a greater
. Plant habits and habitats in the arid portions of South Australia. Plant ecology; Botany; Desert plants. 28 PLANT HABITS AND HABITATS IN THE In the preceding summary of temperature differences characteristic of different depths of soil, actual temperatures only were considered; but another point of view, which is instructive, can be held by a summa- tion or integration of the temperatures, month by month, for different depths. Reference is here made to a depth of 15 cm. and 30 cm. and, in addition, that of meters is included for comparison. As a whole, it appears that there is a greater amount of heat at 30 cm. than at 15 cm., although the latter has the higher maximum. And it ap- pears that the rains of summer cause a sharp fall in the total heat, but that in the rainless early autumn the total, if not the monthly maximum, temperatures recover and the final drop in heat comes only with mid-autumn. The relative amount of heat at a depth of 15 cm. and at a depth of 30 cm. is surprisingly close. It is only with con- siderably greater depth that a marked falling off in the total heat is to be found. Finally, it appears that the total amount of heat is greatest during January at a depth of meters. It will be noted that the soil depths above used in the studies on temperature were relatively great. Higher temperatures are known to occur at less depths. Thus, Coville and MacDougal (1903:41) report a temperature of 111° F. (° C.) in volcanic sand and alluvial deposit at a depth of 5 cm. and cite Toumey to the effect that "the temperature of the soil at the depth of one inch near Tucson reaches the temperature of 113° F. (° C.) with a mean average of ° Fio. 6o.—Mean temperature of Australia for January, after 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 C
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1921
