Drought-adapted geophytes are responding to the effects of climate change in arid and semi-arid environments. In this study, herbarium and historical rainfall data were used to examine the impact of rainfall changes on flowering trends of Pancratium tenuifolium Hochst. ex A.Rich and Scadoxus multiflorus (Martyn) Raf. subsp. multiflorus. Flowering was delayed by approximately 7 days per decade for P. tenuifolium during the period 1930 to 2018 and by approximately 14 days per decade for S. multiflorus subsp. multiflorus during the period 1924 to 2008. Scadoxus multiflorus subsp. multiflorus delayed the day of flowering by approximately 0.3 days per millimetre increase of rainfall, with Pancratium tenuifolium showing a non-significant response to summer rainfall during the same period. Overall, a linear mixed-effects model revealed that the day of flowering was delayed by approximately 8 days per degree rise in latitude and advanced by approximately 9 days per degree rise in longitude. Additionally, summer rainfall had significant effects on the day of flowering with a 1-mm increase in summer rainfall delaying the day of flowering by approximately 0.16 days. These changes in flowering times may ultimately alter the distribution of geophytes in Namibia.

中文翻译：

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使用地球植物的开花物候学追踪气候变化的生物足迹：Pancrateum tenuifolium 和 Scadoxus multiflorus

干旱和半干旱环境中适应干旱的地球植物正在响应气候变化的影响。在这项研究中，植物标本馆和历史降雨数据用于检查降雨变化对 Pancratium tenuifolium Hochst 开花趋势的影响。ex A.Rich 和 Scadoxus multiflorus (Martyn) Raf。亚种 多花。在 1930 年至 2018 年期间，细叶 P. tenuifolium 的开花每十年延迟约 7 天，而 S. multiflorus subsp. 的开花每十年延迟约 14 天。multiflorus 在 1924 年至 2008 年期间。 Scadoxus multiflorus subsp。何首乌使开花日每增加一毫米降雨量延迟约 0.3 天，而 Pancratium tenuifolium 在同一时期对夏季降雨量的反应不显着。全面的，线性混合效应模型显示，纬度每升高一度，开花日就会延迟约 8 天，而经度每升高度，开花日就会提前约 9 天。此外，夏季降雨对开花日有显着影响，夏季降雨量增加 1 毫米会使开花日延迟约 0.16 天。开花时间的这些变化可能最终会改变纳米比亚地质植物的分布。