Topographical variations of soil respiration in the deciduous forest -In the case with extremely immature soil from weathered granite-

摘要

This study considers the time series data of soil respiration and its spatial variation in a small mountainous catchment which is located on complex terrain in Japan. Soil respiration rate was measured for 96 soil collars in the small mountainous catchment (1.6ha) in this study. The relationships between soil temperature, soil moisture content and measured soil respiration rate could be expressed by one function in spite that measured places were located at different topographical locations. The relative difference between calculated and measured soil respiration rate was 23%. The time series data of daily soil respiration was estimated by this function used with the monitoring data of soil temperature and soil moisture content ratio at 5 places inthis cachment. These daily soil respiration rates fluctuated at almost the same time and relative variation ranges between 73-122% in one year.