Journal
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
Volume 14, Issue 1, Pages 88-107Publisher
SPRINGERNATURE
DOI: 10.1039/c4pp90034k
Keywords
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Funding
- Curtin University, Western Australia
- U.S. National Science Foundation [DEB 0815897]
- Loyola University J.H. Mullahy Endowment for Environmental Biology
- Australian Government, Department of Environment
- University of Wollongong
- CONICET (Consejo Nacional de Investigaciones Cientificas y Tecnicas)
- ANPCyT (Agencia Nacional de Promocion Cientifica y Tecnologica)
- UBACyT (Universidad de Buenos Aires Ciencia y Tecnica)
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In this assessment we summarise advances in our knowledge of how UV-B radiation (280-315 nm), together with other climate change factors, influence terrestrial organisms and ecosystems. We identify key uncertainties and knowledge gaps that limit our ability to fully evaluate the interactive effects of ozone depletion and climate change on these systems. We also evaluate the biological consequences of the way in which stratospheric ozone depletion has contributed to climate change in the Southern Hemisphere. Since the last assessment, several new findings or insights have emerged or been strengthened. These include: (1) the increasing recognition that UV-B radiation has specific regulatory roles in plant growth and development that in turn can have beneficial consequences for plant productivity via effects on plant hardiness, enhanced plant resistance to herbivores and pathogens, and improved quality of agricultural products with subsequent implications for food security; (2) UV-B radiation together with UV-A (315-400 nm) and visible (400-700 nm) radiation are significant drivers of decomposition of plant litter in globally important arid and semi-arid ecosystems, such as grasslands and deserts. This occurs through the process of photodegradation, which has implications for nutrient cycling and carbon storage, although considerable uncertainty exists in quantifying its regional and global biogeochemical significance; (3) UV radiation can contribute to climate change via its stimulation of volatile organic compounds from plants, plant litter and soils, although the magnitude, rates and spatial patterns of these emissions remain highly uncertain at present. UV-induced release of carbon from plant litter and soils may also contribute to global warming; and (4) depletion of ozone in the Southern Hemisphere modifies climate directly via effects on seasonal weather patterns (precipitation and wind) and these in turn have been linked to changes in the growth of plants across the Southern Hemisphere. Such research has broadened our understanding of the linkages that exist between the effects of ozone depletion, UV-B radiation and climate change on terrestrial ecosystems.
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