Soil seed banks reveal the legacy of shifting plant assemblages in late-lying alpine snowpatch communities

IF 2.6 3区 生物学 Q2 PLANT SCIENCES
Jerónimo Vázquez-Ramírez, Brodie Verrall, Emily Newling, Tricia Wevill, Catherine Pickering, Ken Green, Jessica A. Rowland, Susanna E. Venn
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Abstract

Snowpatch plant communities, which occur in parts of alpine landscapes where snow accumulates and persists well into the summer, are highly sensitive to climate change. The formation of persistent soil seed banks is recognised as a critical component of a plant community’s resilience to a changing environment. However, our understanding of the ecology of snowpatch soil seed banks and their potential role in the persistence of these threatened communities remains limited. To address this knowledge gap, we (1) characterised the density, diversity and composition of snowpatch soil seed banks along a snowmelt gradient (with early, mid, and late melt zones defined); and (2) contrasted their similarity with long-term vegetation surveys (2020, 2013, 2007) to assess the relationship between soil seed banks and standing vegetation over time. We found persistent soil seed banks in all snowmelt zones and that the snowmelt gradient significantly influenced their density, diversity and composition. Species density and diversity in soil seed banks were higher in the early and mid zones compared to the late zone. However, seedlings from the late zone emerged faster and more synchronously than those emerging from the early and mid zones. The species similarity between seed banks and standing vegetation was relatively high in the two most recent surveys (2020, 2013) compared to the initial survey (2007). However, the composition of life forms and regeneration strategies (i.e. sexual or vegetative reproduction) of seedlings that emerged from the soil seed banks was more similar to the composition of the initial standing vegetation survey (2007) than to the more recent surveys (2020, 2013). Our results suggest that although soil seed banks may be changing as the standing vegetation changes, they still have a compositional similarity to historical plant assemblages, contributing to the resilience of these endangered communities to climate change.

Abstract Image

土壤种子库揭示了晚期高山雪原群落植物组合变化的遗留问题
雪地植物群落出现在积雪并持续到夏季的部分高山地貌中,对气候变化高度敏感。持久性土壤种子库的形成被认为是植物群落抵御环境变化的关键组成部分。然而,我们对雪地土壤种子库的生态学及其在这些受威胁群落的持久性中的潜在作用的了解仍然有限。为了填补这一知识空白,我们:(1)沿着融雪梯度(定义了早期、中期和晚期融雪区)描述了雪场土壤种子库的密度、多样性和组成;(2)对比了它们与长期植被调查(2020 年、2013 年和 2007 年)的相似性,以评估土壤种子库与长期植被之间的关系。我们在所有融雪区都发现了持久的土壤种子库,融雪梯度对其密度、多样性和组成有显著影响。与晚融化区相比,早融化区和中融化区土壤种子库的物种密度和多样性更高。然而,晚发区的幼苗比早发区和中发区的幼苗萌发得更快、更同步。与最初的调查(2007 年)相比,最近两次调查(2020 年和 2013 年)中种子库和常绿植被之间的物种相似度相对较高。然而,从土壤种子库中培育出的幼苗的生命形式组成和再生策略(即有性繁殖还是无性繁殖),与最初的立地植被调查(2007 年)相比,与最近的调查(2020 年、2013 年)更为相似。我们的研究结果表明,虽然土壤种子库可能会随着常绿植被的变化而变化,但它们在组成上仍与历史上的植物组合相似,这有助于这些濒危群落抵御气候变化。
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来源期刊
Alpine Botany
Alpine Botany PLANT SCIENCES-
CiteScore
5.10
自引率
18.50%
发文量
15
审稿时长
>12 weeks
期刊介绍: Alpine Botany is an international journal providing a forum for plant science studies at high elevation with links to fungal and microbial ecology, including vegetation and flora of mountain regions worldwide.
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