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The effect of wind run on transpiration and leaf temperature of Leucospermum concarpodendron on the Cape Peninsula
Parts of the Cape Floristic Region are subject to exceptionally elevated levels of wind in certain seasons, however it has recently been recorded that the Western Cape has experienced a reduction of 25.7% in wind run between the years 1974 - 2005. Shifts in wind run across the globe may significantl...
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| Format: | Thesis |
| Language: | English English |
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Department of Biological Sciences
2017
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| _version_ | 1867611322906050560 |
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| access_status_str | Open Access |
| author | Karpul, Rebecca Karpul, Rebecca |
| author2 | West, Adam |
| author_browse | Karpul, Rebecca West, Adam |
| author_facet | West, Adam Karpul, Rebecca Karpul, Rebecca |
| author_sort | Karpul, Rebecca |
| collection | Thesis |
| description | Parts of the Cape Floristic Region are subject to exceptionally elevated levels of wind in certain seasons, however it has recently been recorded that the Western Cape has experienced a reduction of 25.7% in wind run between the years 1974 - 2005. Shifts in wind run across the globe may significantly affect whole plant physiology through changes in transpiration which can influence mass-flow mediated movement of nutrients in winter as well as leaf temperature. The objectives of this study were to establish whether (a) decreased wind run could reduce transpiration in winter when vapour pressure deficit is low and (b)leaf temperature approaches damaging levels during low wind run conditions in Leucospermum conocarpodendron on the Cape Peninsula over a given time period. High levels of vapour pressure deficit (>l.5 kPa.w4hr⁻¹) did not occur simultaneously with high levels of wind run (>250 m.24hr⁻¹) and therefore the effects that these factors have on transpiration could be separated. Variable rates of transpiration corresponded with reduced wind run under low vapour pressure deficit conditions in winter, therefore decreased wind run may have the potential to reduce transpiration. However, transpiration is highly sensitive to minor fluctuations in vapour pressure deficit during low wind run conditions. Variable leaf temperatures corresponded with low wind run and low vapour pressure deficit conditions, therefore decreased wind run may have the potential to increase leaf temperatures. However, leaf temperature is highly sensitive to low wind run and low vapour pressure deficit conditions. Low wind run conditions, currently predicted for the future, does not pose a threat to transpiration, nutrient uptake and leaf temperature of Leucospermum conocarpodendron plants on the Cape Peninsula. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/25574 |
| institution | University of Cape Town (South Africa) |
| language | eng eng |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| publisher | Department of Biological Sciences |
| publisherStr | Department of Biological Sciences |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/25574 The effect of wind run on transpiration and leaf temperature of Leucospermum concarpodendron on the Cape Peninsula The effect of wind run on transpiration and leaf temperature of Leucospermum concarpodendron on the Cape Peninsula Karpul, Rebecca Karpul, Rebecca West, Adam Botany Parts of the Cape Floristic Region are subject to exceptionally elevated levels of wind in certain seasons, however it has recently been recorded that the Western Cape has experienced a reduction of 25.7% in wind run between the years 1974 - 2005. Shifts in wind run across the globe may significantly affect whole plant physiology through changes in transpiration which can influence mass-flow mediated movement of nutrients in winter as well as leaf temperature. The objectives of this study were to establish whether (a) decreased wind run could reduce transpiration in winter when vapour pressure deficit is low and (b)leaf temperature approaches damaging levels during low wind run conditions in Leucospermum conocarpodendron on the Cape Peninsula over a given time period. High levels of vapour pressure deficit (>l.5 kPa.w4hr⁻¹) did not occur simultaneously with high levels of wind run (>250 m.24hr⁻¹) and therefore the effects that these factors have on transpiration could be separated. Variable rates of transpiration corresponded with reduced wind run under low vapour pressure deficit conditions in winter, therefore decreased wind run may have the potential to reduce transpiration. However, transpiration is highly sensitive to minor fluctuations in vapour pressure deficit during low wind run conditions. Variable leaf temperatures corresponded with low wind run and low vapour pressure deficit conditions, therefore decreased wind run may have the potential to increase leaf temperatures. However, leaf temperature is highly sensitive to low wind run and low vapour pressure deficit conditions. Low wind run conditions, currently predicted for the future, does not pose a threat to transpiration, nutrient uptake and leaf temperature of Leucospermum conocarpodendron plants on the Cape Peninsula. 2017-10-11T10:53:53Z 2017-10-11T10:53:53Z 2012 2017-02-07T13:51:42Z Bachelor Thesis Honours BSc (Hons) http://hdl.handle.net/11427/25574 eng eng application/pdf Department of Biological Sciences Faculty of Science University of Cape Town University of Cape Town |
| spellingShingle | Botany Karpul, Rebecca Karpul, Rebecca The effect of wind run on transpiration and leaf temperature of Leucospermum concarpodendron on the Cape Peninsula |
| thesis_degree_str | Bachelor's / Honours |
| title | The effect of wind run on transpiration and leaf temperature of Leucospermum concarpodendron on the Cape Peninsula |
| title_full | The effect of wind run on transpiration and leaf temperature of Leucospermum concarpodendron on the Cape Peninsula |
| title_fullStr | The effect of wind run on transpiration and leaf temperature of Leucospermum concarpodendron on the Cape Peninsula |
| title_full_unstemmed | The effect of wind run on transpiration and leaf temperature of Leucospermum concarpodendron on the Cape Peninsula |
| title_short | The effect of wind run on transpiration and leaf temperature of Leucospermum concarpodendron on the Cape Peninsula |
| title_sort | effect of wind run on transpiration and leaf temperature of leucospermum concarpodendron on the cape peninsula |
| topic | Botany |
| url | http://hdl.handle.net/11427/25574 |
| work_keys_str_mv | AT karpulrebecca theeffectofwindrunontranspirationandleaftemperatureofleucospermumconcarpodendrononthecapepeninsula AT karpulrebecca theeffectofwindrunontranspirationandleaftemperatureofleucospermumconcarpodendrononthecapepeninsula AT karpulrebecca effectofwindrunontranspirationandleaftemperatureofleucospermumconcarpodendrononthecapepeninsula AT karpulrebecca effectofwindrunontranspirationandleaftemperatureofleucospermumconcarpodendrononthecapepeninsula |