The effect of filter treatment differed among the three species and appeared to depend on litter quality (and especially C:N), producing the greatest effect in recalcitrant litter ( F. Moreover, decomposition was affected more by the filter treatment than mesh size, which controlled access by mesofauna.

Over the entire period, the effect of treatments attenuating blue light and solar UV radiation on leaf litter decomposition was similar to that of our dark treatment, where litter lost 20–30% less mass and had a lower C:N ratio than under the full-spectrum treatment. Litter mass loss and carbon to nitrogen (C:N) ratio of three species: European ash ( Fraxinus excelsior), European beech ( Fagus sylvatica) and pedunculate oak ( Quercus robur), differing in their leaf traits and decomposition rate, were analysed over a period of 7–10 months. For this purpose, we employed custom-made litterbags built using filters that attenuated different regions of the solar spectrum. This experiment investigated how exposure to solar radiation, and specifically UV-B, UV-A, and blue light, affects leaf litter decomposition under a temperate forest canopy in France. Although photodegradation is widely studied in arid environments, there have been few studies in temperate regions.

Sunlight can accelerate the decomposition process through an ensemble of direct and indirect processes known as photodegradation.

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