Abstract
The effect of the needle loss on coniferous forest reflectance was studied by a forest reflectance model. Model calculations were performed for a few Scots-pine dominated forests in two spectral regions, at two spatial resolutions and during two seasons of the year. The most remarkable changes in forest reflectance along with needle loss were noted in the red region in winter with snow covered ground. The simulations show that it is difficult to establish a general relationship between canopy reflectance and needle loss: even if relative changes in reflectance are used. However the model may be useful for inverting remote observations to obtain needle area index.
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