Average variability of the radiation reflected by vegetated surfaces due to differing irradiations

The average variability of the reflected radiation field due to differing distributions of the irradiation in case of a savannah was given in a previous paper. In this paper, equivalent results are given for three more surfaces: bog, pasture land, and coniferous forest. Because the results are rather similar, mean values for vegetated surfaces can be derived. They indicate a change of the reflected radiance by $\text{± 1\%}$ per degree change of the solar zenith angle and per 10% change of the optical depth of the atmosphere.