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  5.     <title>UTas ePrints - Stem water transport and freeze-thaw xylem embolism in conifers and angiosperms in a Tasmanian treeline heath</title>
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  13.     <meta content="Feild, Taylor S." name="eprints.creators_name" />
  14. <meta content="Brodribb, Tim J." name="eprints.creators_name" />
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  21. <meta content="Stem water transport and freeze-thaw xylem embolism in conifers
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  27. <meta content="Chlorophyll fluorescence · Freezing stress ·
  28. Stem hydraulics · Treeline plants · Winteraceae" name="eprints.keywords" />
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  31. <meta content="The effect of freezing on stem xylem hydraulic conductivity and leaf chlorophyll a fluorescence was measured in 12 tree and shrub species from a treeline heath in Tasmania, Australia. Reduction in stem hydraulic conductivity after a single freeze-thaw cycle was minimal in conifers and the vessel-less angiosperm species Tasmannia lanceolata (Winteraceae), whereas mean loss of conductivity in vessel-forming angiosperms fell in the range 17-83%. A positive linear relationship was observed between percentage loss of hydraulic conductivity by freeze-thaw and the average conduit diameter across all 12 species. This supports the hypothesis that large-diameter vascular conduits have a greater likelihood of freeze-thaw cavitation because larger bubbles are produced, which are more likely to expand under tension. Leaf frost tolerances, as measured by a 50% loss of maximum PSII quantum yield, varied from -6 to -13°C, indicating that these species were more frost-sensitive than plants from northern hemisphere temperate forest and treeline communities. There was no evidence of a relationship between frost tolerance of leaves and the resilience of stem water transport to freezing, suggesting that low temperature survival and the resistance of stem water transport to freezing are independently evolving traits. The results of this study bear on the ecological importance of stem freezing in the southern hemisphere treeline zones." name="eprints.abstract" />
  32. <meta content="2001" name="eprints.date" />
  33. <meta content="Oecologia" name="eprints.publication" />
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  36. <meta content="314-320" name="eprints.pagerange" />
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  39. <meta content="http://dx.doi.org/10.1007/s004420000603" name="eprints.official_url" />
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  117. trees and shrubs. NZ J Ecol 1:51–61
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  119. of the south temperate zone, especially sub-alpine species of
  120. Australasia. Ecology 62:563–570
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  127. freeze-thaw cycles and water stress in ring-porous, diffuse-porous,
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  135. embolism in ring-porous, diffuse-porous, and coniferous trees
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  148. Utsumi Y, Sano Y, Funada R, Fujikawa S, Ohtani J (1999) The
  149. progression of cavitation in earlywood vessels of Fraxinus
  150. mandshurica var japonica during freezing and thawing. Plant
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  157. Bot 23:263–271
  158. Yang S, Tyree MT (1992) A theoretical model of hydraulic conductivity
  159. recovery from embolism with comparison to experimental
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  163. Springer, Berlin Heidelberg New York
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  165. stems of some American woody plants. Can J Bot 59:1882–
  166. 1892
  167. Zwieniecki MA, Hutyra L, Thompson MV, Holbrook NM (2000)
  168. Dynamic changes in petiole conductivity in red maple (Acer
  169. rubra L.), tulip tree (Liriodendron tulipifera L.), and northern
  170. fox grape (Vitis labrusca L.). Plant Cell Environ 23:407–414" name="eprints.referencetext" />
  171. <meta content="Feild, Taylor S. and Brodribb, Tim J. (2001) Stem water transport and freeze-thaw xylem embolism in conifers and angiosperms in a Tasmanian treeline heath. Oecologia, 127 (3). pp. 314-320." name="eprints.citation" />
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  294.     <h1 class="ep_tm_pagetitle">Stem water transport and freeze-thaw xylem embolism in conifers and angiosperms in a Tasmanian treeline heath</h1>
  295.     <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Feild, Taylor S.</span> and <span class="person_name">Brodribb, Tim J.</span> (2001) <xhtml:em>Stem water transport and freeze-thaw xylem embolism in conifers and angiosperms in a Tasmanian treeline heath.</xhtml:em> Oecologia, 127 (3). pp. 314-320.</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a href="http://eprints.utas.edu.au/2615/1/feild__and__brod__freez.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/2615/1/feild__and__brod__freez.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />79Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="3424" name="docid" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1007/s004420000603">http://dx.doi.org/10.1007/s004420000603</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">The effect of freezing on stem xylem hydraulic conductivity and leaf chlorophyll a fluorescence was measured in 12 tree and shrub species from a treeline heath in Tasmania, Australia. Reduction in stem hydraulic conductivity after a single freeze-thaw cycle was minimal in conifers and the vessel-less angiosperm species Tasmannia lanceolata (Winteraceae), whereas mean loss of conductivity in vessel-forming angiosperms fell in the range 17-83%. A positive linear relationship was observed between percentage loss of hydraulic conductivity by freeze-thaw and the average conduit diameter across all 12 species. This supports the hypothesis that large-diameter vascular conduits have a greater likelihood of freeze-thaw cavitation because larger bubbles are produced, which are more likely to expand under tension. Leaf frost tolerances, as measured by a 50% loss of maximum PSII quantum yield, varied from -6 to -13°C, indicating that these species were more frost-sensitive than plants from northern hemisphere temperate forest and treeline communities. There was no evidence of a relationship between frost tolerance of leaves and the resilience of stem water transport to freezing, suggesting that low temperature survival and the resistance of stem water transport to freezing are independently evolving traits. The results of this study bear on the ecological importance of stem freezing in the southern hemisphere treeline zones.</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Additional Information:</th><td valign="top" class="ep_row">The original publication is available at www.springerlink.com&#13;
  296. </td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Chlorophyll fluorescence · Freezing stress ·&#13;
  297. Stem hydraulics · Treeline plants · Winteraceae</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/270402.html">270000 Biological Sciences &gt; 270400 Botany &gt; 270402 Plant Physiology</a><br /><a href="http://eprints.utas.edu.au/view/subjects/270400.html">270000 Biological Sciences &gt; 270400 Botany</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">2615</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Scholarly Publications Librarian</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">03 Dec 2007 14:51</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=2615;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&amp;eprintid=2615">item control page</a></p>
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