Simulation of the changes of soil temperature in the vadose zone under high humidity and hot climatic conditions of southern Tohama Plain (original) (raw)

Abstract

Soil temperature is a major factor controlling many physical, chemical, and biological processes in the soil. Therefore, soil temperature greatly influence plant growth and nutrient uptake. Meteorological data mostly focus on the effect of climatic change on the above ground air temperature, which cannot adequately describe actual changes occurring in soil temperature in the vadose zone. In this study, we measured the changes in soil temperature in 10 locations in southern Tohama region, and used the HYDRUS model to simulate the changes in average soil temperature and temporal variations under variable boundary conditions. Soil temperature was continuously monitored at 4 depths of 25, 50, 75, and 100 cm using the 5TE Decagon sensor that was connected to an EM50G micrologger. Soil hydraulic and thermal parameters were obtained by laboratory experiments and inverse modeling against collected data. Meteorological data were used as input data for the boundary conditions. The model was c...

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