Willow above, changes below: Seedless tree invader impacts riparian seed bank in the Patagonian ecotone

IF 2.2 3区环境科学与生态学 Q2 ECOLOGY

Journal of Vegetation Science Pub Date : 2024-12-10 DOI:10.1111/jvs.70003

María del Milagro Torres, Jorgelina Franzese, Melisa Blackhall, María Andrea Relva

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引用次数: 0

Abstract

Aim

The soil seed bank, an ecosystem component with a crucial role in the natural regeneration of plant communities, can be impacted by invasive non-native plants. The impact of non-native plants can be direct with the production of their own seeds or indirect without producing seeds, which has been less investigated. We determined the impact of an invasive seedless tree, non-native willow (Salix × rubens), on the soil seed bank in a riparian ecosystem.

Location

Northwestern Patagonia, Argentina.

Methods

In autumn and spring 2022, we collected soil samples and estimated understorey cover, respectively, in plant communities invaded by willow and in uninvaded communities with a canopy dominated by native species. Over a year, we recorded the seedling emergence of soil samples to estimate the abundance, richness, and composition of the seed bank. We also compared the composition between the seed bank and understorey.

Results

Total seed abundance and native woody species seed abundance decreased twofold and fourfold, respectively, in invaded plant communities in comparison with uninvaded communities. The most affected woody species was Ochetophila trinervis, a key tree species, because of its dominance in the canopy and understorey, and its role in various ecological processes (nitrogen cycling). In addition, willow invasion moderately changed the seed bank species composition producing species turnover. For both the seed bank and the understorey, species composition was more similar between invaded and uninvaded communities than between the seed bank and understorey. Willow invasion had more impact on understorey composition than on the seed bank.

Conclusions

Although willows do not produce seeds regionally, their invasion negatively impacts the soil seed bank by replacing native woody canopy species that supply seeds to the seed bank. These impacts could result in notable changes in the structure of the plant communities and the ecosystem dynamics of riparian areas.

Abstract Image

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上面的柳树，下面的变化：无籽树入侵影响了巴塔哥尼亚交错带的河岸种子库

目的土壤种子库是植物群落自然更新的重要生态系统组成部分，可受到外来入侵植物的影响。非本地植物的影响可以是直接产生种子，也可以是间接不产生种子，这方面的研究较少。研究了外来无籽树柳树对河岸生态系统土壤种子库的影响。位置：阿根廷巴塔哥尼亚西北部。方法于2022年秋季和春季，分别在柳树入侵的植物群落和以本土物种为主的未入侵植物群落中采集土壤样品和估算林下盖度。在一年多的时间里，我们记录了土壤样品的幼苗出现情况，以估计种子库的丰度、丰富度和组成。我们还比较了种子库和林下植被的组成。结果入侵植物群落总种子丰度和本地木本物种种子丰度分别比未入侵植物群落降低2倍和4倍。受影响最严重的木本树种是关键树种Ochetophila trinervis，因为它在林冠和林下具有优势，并且在各种生态过程（氮循环）中起着重要作用。此外，柳树入侵适度改变了种子库的物种组成，产生了物种更替。无论是种子库还是林下，物种组成在入侵与未入侵群落之间比在种子库与林下群落之间更为相似。柳树入侵对林下植被组成的影响大于对种子库的影响。结论杨柳虽然不产生种子，但其入侵取代了本地木本树冠物种，对土壤种子库产生了负面影响。这些影响可能导致河岸地区植物群落结构和生态系统动态的显著变化。

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来源期刊

Journal of Vegetation Science 环境科学-林学

CiteScore

6.00

自引率

3.60%

发文量

审稿时长

2 months

期刊介绍： The Journal of Vegetation Science publishes papers on all aspects of plant community ecology, with particular emphasis on papers that develop new concepts or methods, test theory, identify general patterns, or that are otherwise likely to interest a broad international readership. Papers may focus on any aspect of vegetation science, e.g. community structure (including community assembly and plant functional types), biodiversity (including species richness and composition), spatial patterns (including plant geography and landscape ecology), temporal changes (including demography, community dynamics and palaeoecology) and processes (including ecophysiology), provided the focus is on increasing our understanding of plant communities. The Journal publishes papers on the ecology of a single species only if it plays a key role in structuring plant communities. Papers that apply ecological concepts, theories and methods to the vegetation management, conservation and restoration, and papers on vegetation survey should be directed to our associate journal, Applied Vegetation Science journal.