UVB impacts on the biological component of carbon and nutrient cycles in ecosystems occur through alterations in productivity and other physiological processes of primary producers, consumers, and decomposers. Direct photochemical reactions with the physical environment also occur. Photodegradation of organic and inorganic components of soils (e.g., leaf litter) and dissolved and particulate matter in aquatic systems is an important aspect of chemical cycling in the environment. As with biological effects, UVB is already an important aspect of these processes and the potential impact of increased levels of UVB is not fully understood.
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