三种北极高纬度植物的热发芽特性:它们对气候变暖反应的影响

IF 1.5 4区 地球科学 Q3 ECOLOGY
Soshi Osaki , Masaki Uchida , Takayuki Nakatsubo
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引用次数: 0

摘要

尽管温度对高纬度地区植物种子的繁殖起着至关重要的作用,但人们对这些植物的萌芽对气候变暖的反应却知之甚少。我们进行了一项发芽实验,研究斯瓦尔巴群岛三种常见高纬度植物的热发芽特性:Dryas octopetala、Oxyria digyna 和 Salix polaris。我们将种子置于两种温度条件下:4 至 15 °C 之间逐渐升高和降低的温度。此外,我们还测量了研究地点的地表温度。所有这三种高纬度北极植物的发芽都没有特定的温度要求,最低发芽温度在 4-8 °C 之间。根据地表温度数据,每周平均地表温度超过这一最低发芽温度范围(可发芽期)的时间跨度为 6 月中旬至 8 月中旬。通过模拟 2 ℃ 和 4 ℃ 的升温情景,我们估计可发芽期的开始时间将分别提前 1-2 周和 2-3 周。此外,我们的研究结果表明,在未来气候变暖的条件下,高纬度北极地区有可能出现秋季发芽现象。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermal germination characteristics of three High Arctic plants: Implications for their response to climate warming

Although temperature plays a crucial role in governing seed reproduction in High Arctic plants, little is known about the germination response of these plants to climate warming. We conducted a germination experiment to examine the thermal germination characteristics of three common High Arctic plant species in Svalbard: Dryas octopetala, Oxyria digyna, and Salix polaris. We exposed the seeds to two temperature regimes: gradually increasing and decreasing temperatures between 4 and 15 °C. Additionally, we measured the ground surface temperatures at the study site. All three High Arctic plant species exhibited no specific temperature requirements for germination, with minimum germination temperatures falling within the range of 4–8 °C. Based on the ground surface temperature data, the period during which the weekly average ground surface temperature exceeded this minimum germination temperature range (period available for germination) spanned from mid-June to mid-August. By simulating a warming scenario of 2 and 4 °C, we estimated that the onset of the period available for germination would advance by 1–2 and 2–3 weeks, respectively. Furthermore, our results suggest the possibility of autumn germination in the High Arctic region under future warming conditions.

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来源期刊
Polar Science
Polar Science ECOLOGY-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
3.90
自引率
5.60%
发文量
46
期刊介绍: Polar Science is an international, peer-reviewed quarterly journal. It is dedicated to publishing original research articles for sciences relating to the polar regions of the Earth and other planets. Polar Science aims to cover 15 disciplines which are listed below; they cover most aspects of physical sciences, geosciences and life sciences, together with engineering and social sciences. Articles should attract the interest of broad polar science communities, and not be limited to the interests of those who work under specific research subjects. Polar Science also has an Open Archive whereby published articles are made freely available from ScienceDirect after an embargo period of 24 months from the date of publication. - Space and upper atmosphere physics - Atmospheric science/climatology - Glaciology - Oceanography/sea ice studies - Geology/petrology - Solid earth geophysics/seismology - Marine Earth science - Geomorphology/Cenozoic-Quaternary geology - Meteoritics - Terrestrial biology - Marine biology - Animal ecology - Environment - Polar Engineering - Humanities and social sciences.
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