Decline in plant species richness with a chronic decrease of precipitation: The mediating role of the dominant species

IF 5.6 1区 环境科学与生态学 Q1 ECOLOGY Journal of Ecology Pub Date : 2025-01-31 DOI:10.1111/1365-2745.14483
Gábor Ónodi, Miklós Kertész, Ákos Bede-Fazekas, Péter Batáry, György Kröel-Dulay, Zoltán Botta-Dukát
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植物物种丰富度随降水的长期减少而下降:优势种的中介作用
尽管许多地区干旱的频率和严重程度都有所增加,生物多样性也在下降,但现有的实验证据表明,植物物种丰富度的变化与水分供应的改变有关。旱地面积的不断扩大凸显了预测物种丰富度与降水相关的变化的必要性,这需要更好地了解其机制。我们在一个限水温带草原上进行了一次极端干旱事件的野外试验,并将其与随后7年夏季降水的慢性变化相结合。我们评估了改变的降水制度和之前的极端干旱如何影响物种丰富度。我们比较了仅考虑降水对物种丰富度净效应的简单分析与采用结构方程模型的复杂方法,该方法既包括降水的直接效应,也包括优势草种生物量的间接效应。通过简单的分析,我们发现在存在和不存在极端干旱的情况下,降水与物种丰富度的关系分别为显著的正相关和不显著的正相关。复杂分析揭示了降水量与物种丰富度之间的直接和间接关系。间接途径只在没有干旱的情况下起作用。在这种情况下,降水的增加增加了优势物种的生物量,从而降低了物种丰富度,这是一个中介变量。这种直接关系是正的,独立于干旱的存在。合成。与水分有效性与物种丰富度之间的全球关系一致,我们的实验表明,降雨量减少会降低物种丰富度。此外,我们还发现,降水增加还可能通过优势种生物量的间接途径降低植物物种丰富度。我们的研究结果强调,在极端干旱事件导致优势物种灭绝或倒退后,物种丰富度对降水变化更加敏感。
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来源期刊
Journal of Ecology
Journal of Ecology 环境科学-生态学
CiteScore
10.90
自引率
5.50%
发文量
207
审稿时长
3.0 months
期刊介绍: Journal of Ecology publishes original research papers on all aspects of the ecology of plants (including algae), in both aquatic and terrestrial ecosystems. We do not publish papers concerned solely with cultivated plants and agricultural ecosystems. Studies of plant communities, populations or individual species are accepted, as well as studies of the interactions between plants and animals, fungi or bacteria, providing they focus on the ecology of the plants. We aim to bring important work using any ecological approach (including molecular techniques) to a wide international audience and therefore only publish papers with strong and ecological messages that advance our understanding of ecological principles.
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