高纬度北极地区三十年变化后啮齿类动物的增加

IF 1.9 4区 地球科学 Q3 ECOLOGY Polar Research Pub Date : 2023-12-08 DOI:10.33265/polar.v42.9560
James A. Schaefer
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引用次数: 0

摘要

气候变化预示着对北极植被的严重影响。通过对永久性地块的长期观测,可能会加深对这些影响的理解。我评估了加拿大努纳武特维多利亚岛东南部 80 个永久性地块三十年来苔原植被的变化。我比较了基线期(1991 年和 1992 年)和当代(2019 年和 2022 年)禾本科植物、苔藓以及常见草本植物、灌木和地衣物种的覆盖率和频率。我发现一些物种和生长形式的覆盖率发生了重大变化--禾本科植物增加,Dryas integrifolia、Polygonum viviparum和Saxifraga oppositifolia减少,苔藓和Cassiope tetragona略有减少,但其他类群没有发现变化。Dryas integrifolia  的减少在海拔较低的地方更为明显,在地块内和其他地方都有明显的死亡斑点。物种丰度的变化与土壤深度的变化没有明显的相关性。这些变化表现为禾本科植物群落更加丰富,与北极寒冷地区预期的气候变化影响一致。对永久性地块进行重复观测有助于检测和了解长期的生态变化。
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Increases in graminoids after three decades of change in the High Arctic

Climate change portends serious implications for Arctic vegetation. Understanding these effects is likely to be enhanced with long-term observations from permanent plots. I evaluated three decades of change in tundra vegetation from 80 permanent plots on south-eastern Victoria Island, Nunavut, Canada. I compared baseline (1991 and 1992) and contemporary (2019 and 2022) periods in the cover and frequency of graminoids, mosses and common species of forbs, shrubs and lichens. I found substantial shifts in cover of several species and growth forms—an increase in graminoids, decreases in Dryas integrifolia, Polygonum viviparum and Saxifraga oppositifolia, and marginally significant declines in mosses and Cassiope tetragona, but no detectable changes in other groups. The decline in Dryas integrifolia was more pronounced at lower elevations and was noticeable as patches of apparent mortality, inside the plots and elsewhere. The shifts in species abundance were not significantly correlated with each other, nor with changes in soil depth. These changes, manifest as communities with more abundant graminoids, are consistent with expected climate change effects in colder regions of the Arctic. Repeated observations of permanent plots can aid in detecting and understanding long-term ecological change.

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来源期刊
Polar Research
Polar Research 地学-地球科学综合
CiteScore
3.20
自引率
5.30%
发文量
22
审稿时长
>12 weeks
期刊介绍: Since 1982, Polar Research has been the international, peer-reviewed journal of the Norwegian Polar Institute, Norway''s central institution for research, environmental monitoring and mapping of the polar regions. Aiming to promote the exchange of scientific knowledge about the Arctic and Antarctic across disciplinary boundaries, Polar Research serves an international community of researchers and managers. As an open-access journal, Polar Research makes its contents freely available to the general public. Original primary research papers comprise the mainstay of Polar Research. Review articles, brief research notes, letters to the editor and book reviews are also included. Special issues are published from time to time. The scope of Polar Research encompasses research in all scientific disciplines relevant to the polar regions. These include, but are not limited to, the subfields of biology, ecology, geology, oceanography, glaciology and atmospheric science. Submissions from the social sciences and those focusing on polar management and policy issues are welcome. Contributions about Antarctica are particularly encouraged.
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