抄録
Film-solarimeters were deployed to measure the spatial distribution and the seasonal variation of the amount of solar radiation in a broadleaf deciduous forest in a cool-temperature zone. The experimental field is located in Takayama City in the central part of Japan and the forest floor is covered mainly withdwarf bamboo (Sasa senanensis Rehd). The films were placed on and under the floor vegetation at ninety points over an area of 0.72 ha and were replaced at two-week intervals from April to November, 1998. This new method worked well when the mean daily temperature ranged between 8 and 20 degrees. The haracteristics of the light environment, which govern the amount of carbon fixation into the floor stratum in the forest, were related with topography, leaf phenology of the tree species and vegetation.
