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Effects of increasing ultraviolet B radiation on decomposition and soil organic matter dynamics: a synthesis and modelling study

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Abstract

The net effect of increasing ultraviolet B radiation levels on ecosystems is unknown. Most of the relevant ecological research has focused on the responses of living plants and algae to ultraviolet B exposure, with little attention directed toward other groups. However, research in such diverse areas of study as the degradation of textiles, pigments, synthetic polymers, paper, cellulose, wood, and museum artifacts show that ultraviolet light is a significant factor in the decay of many organic compounds. In aquatic ecosystems, the photochemical degradation of recalcitrant, dissolved organic compounds is increased by ultraviolet B exposure, and similar reactions could make important contributions to organic matter turnover in terrestrial ecosystems. This hypothesis is supported by observed patterns of decomposition of exposed surface litter in arid and semi-arid environments. Since plant lignins are both photochemically reactive and form a significant component of soil organic matter, ultraviolet B-induced lignin degradation could alter material cycling in terrestrial ecosystems. However, results of a model simulating the potential effects of ultraviolet B-induced lignin degradation suggest that higher rates of litter turnover may have only slight effects on soil organic matter dynamics.

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Authors and Affiliations

  1. Fcology Program, Department of Biological Sciences, Texas Tech University, 79409-3131, Lubbock, TX, USA

    Daryl L. Moorhead

  2. Merlewood Research Station, Institute of Terrestrial Ecology, Grange-Over-Sands, LA11 6JU, Cumbria, UK

    Terry Callaghan

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  1. Daryl L. Moorhead
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  2. Terry Callaghan
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Moorhead, D.L., Callaghan, T. Effects of increasing ultraviolet B radiation on decomposition and soil organic matter dynamics: a synthesis and modelling study. Biol Fertil Soils 18, 19–26 (1994). https://doi.org/10.1007/BF00336439

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