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Direct and Indirect Effects of UV-B Exposure on Litter Decomposition: A Meta-Analysis

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  • Xinzhang Song
  • Changhui Peng
  • Hong Jiang
  • Qiuan Zhu
  • Weifeng Wang

Abstract

Ultraviolet-B (UV-B) exposure in the course of litter decomposition may have a direct effect on decomposition rates via changing states of photodegradation or decomposer constitution in litter while UV-B exposure during growth periods may alter chemical compositions and physical properties of plants. Consequently, these changes will indirectly affect subsequent litter decomposition processes in soil. Although studies are available on both the positive and negative effects (including no observable effects) of UV-B exposure on litter decomposition, a comprehensive analysis leading to an adequate understanding remains unresolved. Using data from 93 studies across six biomes, this introductory meta-analysis found that elevated UV-B directly increased litter decomposition rates by 7% and indirectly by 12% while attenuated UV-B directly decreased litter decomposition rates by 23% and indirectly increased litter decomposition rates by 7%. However, neither positive nor negative effects were statistically significant. Woody plant litter decomposition seemed more sensitive to UV-B than herbaceous plant litter except under conditions of indirect effects of elevated UV-B. Furthermore, levels of UV-B intensity significantly affected litter decomposition response to UV-B (P

Suggested Citation

  • Xinzhang Song & Changhui Peng & Hong Jiang & Qiuan Zhu & Weifeng Wang, 2013. "Direct and Indirect Effects of UV-B Exposure on Litter Decomposition: A Meta-Analysis," PLOS ONE, Public Library of Science, vol. 8(6), pages 1-1, June.
    • Handle: RePEc:plo:pone00:0068858
    DOI: 10.1371/journal.pone.0068858
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    References listed on IDEAS

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    1. Amy T. Austin & Lucía Vivanco, 2006. "Plant litter decomposition in a semi-arid ecosystem controlled by photodegradation," Nature, Nature, vol. 442(7102), pages 555-558, August.
    2. Kees Jan van Groenigen & Craig W. Osenberg & Bruce A. Hungate, 2011. "Increased soil emissions of potent greenhouse gases under increased atmospheric CO2," Nature, Nature, vol. 475(7355), pages 214-216, July.
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