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Assessment of ozone impacts on vegetation in southern Africa and directions for future research

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dc.contributor.author Van Tienhoven, AM en_US
dc.contributor.author Otter, L en_US
dc.contributor.author Lenkopane, M en_US
dc.contributor.author Venjonoka, K en_US
dc.contributor.author Zunckel, M en_US
dc.date.accessioned 2007-03-14T08:12:20Z en_US
dc.date.accessioned 2007-06-07T10:10:23Z
dc.date.available 2007-03-14T08:12:20Z en_US
dc.date.available 2007-06-07T10:10:23Z
dc.date.copyright en_US
dc.date.issued 2005-03 en_US
dc.identifier.citation Van Tienhoven, et al. 2005. Assessment of ozone impacts on vegetation in southern Africa and directions for future research. South African Journal of Science, vol. 101(4), pp 143-148 en_US
dc.identifier.issn 0038-2353 en_US
dc.identifier.uri http://hdl.handle.net/10204/1923 en_US
dc.identifier.uri http://hdl.handle.net/10204/1923
dc.description.abstract Levels of background ozone in Southern Africa are high enough to cause concern, as they frequently exceed the 40 ppb threshold currently adopted by the United Nations Economic Commission for Europe. They also surpass the exposure index of 3000 ppb.h, which is intended to protect crops and natural vegetation in Europe. Natural vegetation and crops in southern Africa may be tolerant of elevated ozone concentrations because of naturally high background levels, but additional anthropogenic inputs of ozone precursors may result in exceedances of ozone damage thresholds that affect vegetation. Current impact assessment policies in Europe are shifting from an exposure approach to one based on flux. If existing European methods are to be applied in southern Africa, the flux model would be the more appropriate of the two to assess likely impacts. Besides data requirements for flux modelling, the method would need to accommodate extended growing periods, locally appropriate crops such as maize, and the frequency and extent of drought periods. In southern Africa, crop production may be more greatly affected by drought, floods, and agronomic inputs but the possible deleterious effects of elevated ozone are sufficient to merit further investigation. en_US
dc.format.extent 121127 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en en_US
dc.publisher Academy Science South Africa en_US
dc.rights Copyright: 2005 Academy Science South Africa en_US
dc.source en_US
dc.subject Future research directions en_US
dc.subject Southern Africa en_US
dc.subject Ozone assessments en_US
dc.subject Ozone impacts en_US
dc.title Assessment of ozone impacts on vegetation in southern Africa and directions for future research en_US
dc.type Article en_US
dc.identifier.apacitation Van Tienhoven, A., Otter, L., Lenkopane, M., Venjonoka, K., & Zunckel, M. (2005). Assessment of ozone impacts on vegetation in southern Africa and directions for future research. http://hdl.handle.net/10204/1923 en_ZA
dc.identifier.chicagocitation Van Tienhoven, AM, L Otter, M Lenkopane, K Venjonoka, and M Zunckel "Assessment of ozone impacts on vegetation in southern Africa and directions for future research." (2005) http://hdl.handle.net/10204/1923 en_ZA
dc.identifier.vancouvercitation Van Tienhoven A, Otter L, Lenkopane M, Venjonoka K, Zunckel M. Assessment of ozone impacts on vegetation in southern Africa and directions for future research. 2005; http://hdl.handle.net/10204/1923. en_ZA
dc.identifier.ris TY - Article AU - Van Tienhoven, AM AU - Otter, L AU - Lenkopane, M AU - Venjonoka, K AU - Zunckel, M AB - Levels of background ozone in Southern Africa are high enough to cause concern, as they frequently exceed the 40 ppb threshold currently adopted by the United Nations Economic Commission for Europe. They also surpass the exposure index of 3000 ppb.h, which is intended to protect crops and natural vegetation in Europe. Natural vegetation and crops in southern Africa may be tolerant of elevated ozone concentrations because of naturally high background levels, but additional anthropogenic inputs of ozone precursors may result in exceedances of ozone damage thresholds that affect vegetation. Current impact assessment policies in Europe are shifting from an exposure approach to one based on flux. If existing European methods are to be applied in southern Africa, the flux model would be the more appropriate of the two to assess likely impacts. Besides data requirements for flux modelling, the method would need to accommodate extended growing periods, locally appropriate crops such as maize, and the frequency and extent of drought periods. In southern Africa, crop production may be more greatly affected by drought, floods, and agronomic inputs but the possible deleterious effects of elevated ozone are sufficient to merit further investigation. DA - 2005-03 DB - ResearchSpace DP - CSIR KW - Future research directions KW - Southern Africa KW - Ozone assessments KW - Ozone impacts LK - https://researchspace.csir.co.za PY - 2005 SM - 0038-2353 T1 - Assessment of ozone impacts on vegetation in southern Africa and directions for future research TI - Assessment of ozone impacts on vegetation in southern Africa and directions for future research UR - http://hdl.handle.net/10204/1923 ER - en_ZA


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