砂丘地球根畑のCO₂濃度の日変化

The diurnal changes in the behavior of CO₂ concentration in tulip，lycoris and daffodil communities which were cultivated in a sandy field were investigated at various heights，from the sand surface to 4m. The CO₂ concentration in the tulip community was about 365ppm on a night with only a slight wind. The difference between the surface and the 4m height was about 35ppm. However on a windy night the difference was only 2-3ppm. This tendency was also shown in the lycoris and daffodil communities. The changing range of CO₂ concentration difference between 10cm and 4m in the daffodil field was very little on a windy day，but on a day with only a slight wind the range was very great，being 29ppm.