Study on hydrological processes in a soil-plant-atmosphere

研究结果表明，木本植物茎中储存的水分在容积含水量的日变化和日变化中都表现出动态的行为，水分在蒸腾过程中起着重要的作用。以日本红松为例，在蒸腾过程中，储存在茎中的水分约占消耗水量的10%至20%。结果还表明，当茎中储存的水分开始用于蒸腾时，根部与茎上部之间的水势存在一个阈值。在本研究中，利用电阻率层析成像方法成功地实现了土壤水分在三维空间中的行为可视化。认为在不久的将来的研究中，这种方法将更有利于阐明植物在土壤中水分运动的实际情况。此外，本研究不仅总结了锶同位素技术在酸雨研究中的有效性，还从降水循环和茎流作用的角度总结了森林在流域水循环中的作用，并在多个国内外会议上发表了研究成果。

The results of the study indicate that the water stored in a stem of woody plant shows dynamic behavior in both diurnal and daily variations in volumetric water content and the water acts important role in a transpiration process. In the case of Japanese red pine, the water stored in the stem contributes about 10 to 20 % to the consumed water volume in the transpiration process. The results also indicate that there exists a threshold value in water potential between the root and the upper part of the stem when it begins to contribute of the water stored in the stem to transpiration.In the study, it succeeded to visualize the soil water behavior in three-dimensional space using the resistivity tomography method. It is considered that this method will be superior in elucidation of the actual condition of water movement through the soil to the plant in near future studies. Furthermore, in the study, not only summarize the effectiveness of strontium isotope technique in the acid rain studies but also summarize the role of forest in the hydrological cycle of a basin from view points of precipitation recycling and the role of stemflow, and the results of the study were presented at several domestic and international conferences.