火山性土の凍結並融凍作用が土壌と作物に及ぼす影響と之れが対策に関する調査研究(第1報)

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Generally, at the district of volcanogeneuos soils in Hokkaido snow accumlate a little and soil freeze about 30-100 cm. depth, author investigated process of freezing and thawing action of soil, their remedial measures for agriculture. In this report author described the process of freezing and thawing action of volcanogeneuos soil. (1) Form of freezing of volcanogeneous soils are differ markedly according to soil texture. (2) On observation of frozen profile of volcanic ash soils, ice pillar horizon existed numerous time repeatedly in the soil stratum and so called frozen soil horizon and ice pillar horizon alternaly to each other. (See Fig. 1) (3) On the observation of frozen profile of volcanic pumic soils, spaces between pumices are fulfilled by ice particles and pumices are also frozen. Interior of pumices are extremely dry state and moisture increase gradually towards outside and only the minute thin portion of surface of pumice are frozen. The drying states of interior of pumices become more and more less remarkable toward deep, at the same time ice particle also decrease, and unfrozen pumices internal moisture is uniform.(See Fig.2) (4) Volcanic sandy soils situate between volcanic ash soils and volcanic pumice soil, then its freezing form also possess both characteristics of them, but not so remarkably. (See Fig. 3) (5) On occation of thawing in valcanic ash soils, water which come from thawing of snow or from melting ice pillars in frozen soils are not permitted to penetrate to down on account of freezing state of lower stratum, moreover water of ice pillar horizons and frozen soil horizon have been brought through lifting of soil water content in the soil near are more abundant as if it is a paddy field. (6) In volcanic pumice soils, ice particles which have been fulfilled in the spaces between pumices are not result of lifted up from the below, water from melting ice particles are given buck again to pumices in neighbouring by their own absorption, even if all soils of sub-horizons do not melt, so amount of stagnated water on the ground surface are little. (7) On volcanic sandy soils, the freezing show such as forms that both of volcanic ash and volcanic pumice, therefore on occation of thawing the amount of stagnated water on the ground surface are few in comparision with volcanic ash soil, but excessive water are lifted up from the below, therefore drying soils after thawing of snow are delaid far much in spite of sand than ordinary soils.
社団法人日本土壌肥料学会の論文
1951-03-31

火山性土の凍結並融凍作用が土壌と作物に及ぼす影響と之れが対策に関する調査研究(第1報)

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