Studies on the freezing and thawing of the volcanic ash soils in eastern Hokkaido [Japan], 3: Soil temperature [of nursery bed] in a seasonal frost area

asia asie chemicophysical properties clima climat climate climatic zones cold zones condiciones ambientales condition de milieu environment environmental conditions environmental temperature environnement freezing point japan japon lithological soil types medio ambiente periodicidad periodicity saison seasons site factors soil physicochemical properties soil temperature soil types sol volcanique temperatura temperatura del suelo temperature temps tiempo time timing type de sol type de sol lithologique volcanic soils zona fria zone climatique zone froide