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High adult mortality and failure of recruitment in a population of Banksia spinulosa following high-intensity fire
Austral Ecology ( IF 1.5 ) Pub Date : 2022-06-22 , DOI: 10.1111/aec.13208
Robert J. Whelan 1 , David J. Ayre 1
Affiliation  

Serotinous plants that both release seed and resprout after fire are thought to be resistant to wildfires within the range of intensities that have been experienced up until now. However, the frequency and scale of intense wildfires is increasing under climate change. We studied annual flowering and fruit-set in a large population of Banksia spinulosa plants in south-eastern Australia from the early 1990s to 2006. The results led us to predict that there would be little recruitment from seedlings after the next fire but good resprouting from very long-lived lignotubers. Our study population burned in the widespread, high-intensity wildfires of December 2019, providing an opportunity to test the hypothesis. Most above-ground stems and cones were reduced to ash, and only 15 cones (on 10 plants) remained after the fire. We found no seedlings in the 0.3 ha site that had initially contained over 350 adult plants. Little natural mortality had been observed pre-fire, but by 5 months after the fire, nearly 25% of lignotubers had failed to resprout. We conclude that even common and widespread resprouting species will suffer population decline and reduced genetic diversity as high-intensity fires become more extensive and frequent.

中文翻译:

高强度火灾后 Banksia spinulosa 种群的高成人死亡率和招募失败

在火灾后释放种子和重新发芽的血清素植物被认为对迄今为止经历的强度范围内的野火具有抵抗力。然而,在气候变化下,强烈野火的频率和规模正在增加。我们研究了大量刺槐的年度开花和坐果从 1990 年代初到 2006 年,澳大利亚东南部的植物。结果使我们预测,下一次火灾后幼苗的补充很少,但寿命很长的木质块的重新发芽良好。我们的研究人群在 2019 年 12 月大范围、高强度的野火中燃烧,为检验该假设提供了机会。大多数地上的茎和球果被烧成灰烬,火灾后只剩下 15 个球果(在 10 株植物上)。我们在最初包含 350 多株成年植物的 0.3 公顷场地中没有发现幼苗。火灾前几乎没有观察到自然死亡,但在火灾发生 5 个月后,近 25% 的木质块茎未能重新发芽。
更新日期:2022-06-22
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