Foliar freezing resistance of Australian alpine plants over the growing season
Abstract We assessed the freezing resistance of leaves ex situ of 25 Australian alpine plant species. We compared the freezing resistance of forb, graminoid and shrub species from three alpine summits of different altitudes; from a low altitude site just above treeline, to a fully alpine tundra site...
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crwiley:10.1111/j.1442-9993.2012.02387.x 2024-09-30T14:45:23+00:00 Foliar freezing resistance of Australian alpine plants over the growing season VENN, SUSANNA E. MORGAN, JOHN W. LORD, JANICE M. 2012 http://dx.doi.org/10.1111/j.1442-9993.2012.02387.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1442-9993.2012.02387.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1442-9993.2012.02387.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Austral Ecology volume 38, issue 2, page 152-161 ISSN 1442-9985 1442-9993 journal-article 2012 crwiley https://doi.org/10.1111/j.1442-9993.2012.02387.x 2024-09-05T05:09:11Z Abstract We assessed the freezing resistance of leaves ex situ of 25 Australian alpine plant species. We compared the freezing resistance of forb, graminoid and shrub species from three alpine summits of different altitudes; from a low altitude site just above treeline, to a fully alpine tundra site. Foliar freezing resistance (LT 50 ) in spring varied from −5.9°C to −18.7°C and standardized LT 50 values within species were significantly related to site altitude. Additionally, when comparing all the species in the study, freezing resistance was significantly related to site; the LT 50 of samples from a low‐altitude summit (1696 m) were significantly lower than those of samples from mid‐ (1805 m) and high‐altitude (1860 m) summits. The LT 50 of juvenile foliage did not differ significantly from that of adult foliage. Shrubs were highly resistant to freezing. At the highest summit, we examined the course of seasonal freezing resistance from early summer to early autumn across three alpine plant communities that differed in the time of natural snowmelt; from sheltered (snowpatch) to exposed (open heath). No differences in freezing resistance over the growing season were detected for exposed or sheltered communities and there were no consistent trends indicating frost hardening over the growing season. Overall, the common Australian alpine species we investigated appear well adapted to freezing conditions throughout the snow‐free growing season. We have no evidence to suggest that freezing temperatures soon after snowmelt in spring are especially damaging to the alpine plants at these summits. Article in Journal/Newspaper Tundra Wiley Online Library Austral Ecology 38 2 152 161 |
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English |
description |
Abstract We assessed the freezing resistance of leaves ex situ of 25 Australian alpine plant species. We compared the freezing resistance of forb, graminoid and shrub species from three alpine summits of different altitudes; from a low altitude site just above treeline, to a fully alpine tundra site. Foliar freezing resistance (LT 50 ) in spring varied from −5.9°C to −18.7°C and standardized LT 50 values within species were significantly related to site altitude. Additionally, when comparing all the species in the study, freezing resistance was significantly related to site; the LT 50 of samples from a low‐altitude summit (1696 m) were significantly lower than those of samples from mid‐ (1805 m) and high‐altitude (1860 m) summits. The LT 50 of juvenile foliage did not differ significantly from that of adult foliage. Shrubs were highly resistant to freezing. At the highest summit, we examined the course of seasonal freezing resistance from early summer to early autumn across three alpine plant communities that differed in the time of natural snowmelt; from sheltered (snowpatch) to exposed (open heath). No differences in freezing resistance over the growing season were detected for exposed or sheltered communities and there were no consistent trends indicating frost hardening over the growing season. Overall, the common Australian alpine species we investigated appear well adapted to freezing conditions throughout the snow‐free growing season. We have no evidence to suggest that freezing temperatures soon after snowmelt in spring are especially damaging to the alpine plants at these summits. |
format |
Article in Journal/Newspaper |
author |
VENN, SUSANNA E. MORGAN, JOHN W. LORD, JANICE M. |
spellingShingle |
VENN, SUSANNA E. MORGAN, JOHN W. LORD, JANICE M. Foliar freezing resistance of Australian alpine plants over the growing season |
author_facet |
VENN, SUSANNA E. MORGAN, JOHN W. LORD, JANICE M. |
author_sort |
VENN, SUSANNA E. |
title |
Foliar freezing resistance of Australian alpine plants over the growing season |
title_short |
Foliar freezing resistance of Australian alpine plants over the growing season |
title_full |
Foliar freezing resistance of Australian alpine plants over the growing season |
title_fullStr |
Foliar freezing resistance of Australian alpine plants over the growing season |
title_full_unstemmed |
Foliar freezing resistance of Australian alpine plants over the growing season |
title_sort |
foliar freezing resistance of australian alpine plants over the growing season |
publisher |
Wiley |
publishDate |
2012 |
url |
http://dx.doi.org/10.1111/j.1442-9993.2012.02387.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1442-9993.2012.02387.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1442-9993.2012.02387.x |
genre |
Tundra |
genre_facet |
Tundra |
op_source |
Austral Ecology volume 38, issue 2, page 152-161 ISSN 1442-9985 1442-9993 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1442-9993.2012.02387.x |
container_title |
Austral Ecology |
container_volume |
38 |
container_issue |
2 |
container_start_page |
152 |
op_container_end_page |
161 |
_version_ |
1811646084638834688 |