Changes in soil CO_2 concentration and soil respiration during rainfall events: analysis focused on change of soil gas diffusion coefficient

通过对两次降雨过程中土壤呼吸和土壤CO2浓度剖面的测定，研究了降雨对土壤呼吸和土壤CO2浓度的影响。这些数据进行了比较，在土壤中的气体扩散系数来自观测土壤温度和湿度。结果表明，土壤CO_2贮量决定了降雨过程中土壤CO_2浓度和土壤呼吸的变化规律。由于降雨的季节性和土壤CO_2生产剖面的不同，导致不同降雨事件的土壤CO_2状况不同。

Soil respiration and soil CO_2 concentration profile were measured during two rainfall events to investigate the effect of rainfall on soil respiration and soil CO_2 concentration. Those data were compared with gas diffusion coefficients in soil derived from observed soil temperature and moisture. As a result, soil CO_2 storage determined the patterns of soil CO_2 concentration and soil respiration during rainfall. The pattern was different among rainfall events due to different soil CO_2 regime which was induced by seasonality of rainfall and soil CO_2 production profile.