Bark functional ecology and its influence on the distribution of Australian half-butt eucalypts,Austral Ecology

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Bark functional ecology and its influence on the distribution of Australian half-butt eucalypts
Austral Ecology ( IF 1.6 ) Pub Date : 2021-05-03 , DOI: 10.1111/aec.13045
Michael J. Lawes ₁ , Leigh‐Ann Woolley _{2,

3} , Sam Van Holsbeeck ₃ , Brett P. Murphy ₄ , Geoffrey E. Burrows ₅ , Jeremy J. Midgley ₆

Affiliation

Half-butt eucalypts (genera: Eucalyptus and Corymbia) have both thick outer bark at the stem base (half-butt) conferring resistance to surface fire, and thin photosynthetic canopy bark that reduces moisture stress. Here we examine how the functional ecology of dual outer bark types influences the wide distribution of Australian half-butt species. We evaluate the proposition that half-butts should predominate in semi-arid environments prone to surface fires. We measured the bark thickness, butt height relative to flame/fire char height and tree height, height of first branch, and the location and prevalence of epicormic resprouting of co-occurring Eucalyptus miniata (half-butt) and E. tetrodonta (fibrous bark only) individuals, across 15 sites with contrasting fire frequencies (2000–2015) in the Darwin region. Total tree height was compared with butt height for all E. miniata individuals. The survival of half-butt and other eucalypt species, as well as non-eucalypts, was investigated at three sites affected by intense gamba grass (Andropogon gayanus) fire. The proportion of half-butt species in each of Australia’s 85 bioregions was calculated from geographic distribution records of 618 eucalypt species. Mean annual fire frequency (1997–2010), fire type (crown or surface fires) and climate in each bioregion was determined from satellite-derived records.

中文翻译：

树皮功能生态学及其对澳大利亚半臀桉树分布的影响

半臀桉树（属：桉属和Corymbia）在茎基部（半臀）有厚厚的外皮，可以抵抗地表火灾，还有薄的光合树冠树皮，可以减少水分胁迫。在这里，我们研究了双重外树皮类型的功能生态学如何影响澳大利亚半屁股物种的广泛分布。我们评估了半屁股应该在容易发生表面火灾的半干旱环境中占主导地位的命题。我们测得的树皮的厚度，相对于火焰/火炭高度和树高，第一分支的高度，和共同发生的epicormic resprouting的位置和患病对接高度桉树 君子兰（半对接）和Ë。河豚（仅限纤维树皮）个体，分布在达尔文地区 15 个火灾频率不同的地点（2000-2015 年）。将所有E 的总树高与对接高度进行比较。miniata个人。在受强烈冈巴草 ( Andropogon gayanus ) 火灾影响的三个地点调查了半屁股和其他桉树物种以及非桉树的生存情况。根据 618 种桉树物种的地理分布记录，计算了澳大利亚 85 个生物区中每个生物区的半屁股物种的比例。每个生物区的平均年度火灾频率（1997-2010）、火灾类型（冠部或地表火灾）和气候是根据卫星衍生记录确定的。

更新日期：2021-05-03

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