In the periglacial environment of the Japanese Alps, temperature distributions in surface soil layer are important for the formation of micro topography. However, the lack of soil temperature data in alpine zone of the Japanese Alps are serious. The purposes of this paper are to make clear the diurnal and annual variations of soil temperature on the summit area of the Mt. Tateyama and the Ontake Volcanoes, and the lapse rates along the mountain slopes. Field observations were carried ont in the cooling phase of the year from mid summer to early winter. As we failed to get the data in mid winter, we utilized the data of annual soil temperature change at Tokuyama Village, heavy snow fall area west of the Ontake, combining with the data of the field observations, to obtain empirical equa-tions of annual change of the soil temperature on the several slopes of the Ontake Volcanoes.
The lapse rates and the diurnal changes of soil temperature during the field observations are shown in Figs. 4 and 5 and Table 1. Annual change of soil temperature in alpine zone (T_z) is expressed by the Ingersoll's equation as follows;
T_z=T_M+A₀exp (-az)sin(wt-az-γ)
where T_M mean soil temperature A amplitude of soil surface temperature α;_??_ρ; density of soil, c; specific heat of soil, pk_g; Austausch oefficient, ω=22π/p, p; period of temperature cycle, z; depth of soil. Some of the results of the field observations and the estimations by the use of the above equation are shown in Figs. 8_??_10.

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