限水植物群落中土壤水分的增加和减少会导致生物量的非对称反应,但不会导致多样性的非对称反应

IF 2.2 3区 环境科学与生态学 Q2 ECOLOGY
Liesbeth van den Brink, Rafaella Canessa, Pierre Liancourt, Harald Neidhardt, Lohengrin A. Cavieres, Yvonne Oelmann, Maaike Y. Bader, Katja Tielbörger
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引用次数: 0

摘要

目的 降水模式的变化,如预测的极端气候频率的增加,很可能会改变植物群落,但究竟是对干旱还是对更湿润条件的反应会导致一致的、相反的反应还存在争议。在此,我们评估了限水植物群落的生物量生产和物种多样性对土壤水分变化的方向(增加或减少)和程度(微观和宏观气候影响)的响应。 地点 我们将智利两种气候(半干旱和地中海)的含有种子库的土壤在微观气候(对面山坡)和宏观气候(气候之间)尺度上进行了相互转移。 结果 从较湿润气候转移到较干燥气候的土壤的生物量产生与可用土壤湿度无关。在气候最潮湿的湿坡上,生物量最低。转移到较干燥气候(代表最大的气候变化)后,生物量产量增加。尽管如此,在土壤湿度适中的地中海干坡上,从湿坡到干坡的迁移所产生的总生物量最高。然而,在同一片地中海干坡上,反向迁移(从较干到较湿)的土壤的生物量几乎为零。24 个月后的多样性不受微气候变化的影响,但移植到较干旱气候的土壤中的植物群落多样性有所增加。 结论 我们的研究结果表明了气候变化的方向和幅度,以及所研究的响应因子对检测方向依赖性响应的重要性;即物种丰富度具有线性和可逆的响应。然而,生物量的响应取决于移植材料的来源(土壤和植物群落),这表明了历史依赖性(滞后性)。这强调了单向气候操纵实验的响应可能无法捕捉到植物群落对气候变化响应的全部性质。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Increases and decreases in soil moisture in water-limited plant communities cause asymmetrical responses in biomass but not in diversity

Increases and decreases in soil moisture in water-limited plant communities cause asymmetrical responses in biomass but not in diversity

Aims

Changes in precipitation patterns, such as the predicted increases in the frequency of climatic extremes, are likely to alter plant communities, but whether responses to drought or to wetter conditions respectively cause consistent, opposite responses is debated. Here, we assessed the response in biomass production and species diversity of water-limited plant communities to the direction (increase or decrease) and magnitude (micro- and macro-climatic effects) of changes in soil moisture.

Location

We reciprocally translocated soils containing seed banks from two climates (semi-arid and mediterranean) at a micro-climatic (opposite slopes) and a macro-climatic scale (between climates) in Chile.

Results

Biomass production for the soils that were translocated from wetter to drier climates was unrelated to the available soil moisture. The lowest biomass was produced in the wettest climate on the wet slope. Biomass production increased after a translocation to the drier climate (representing the largest change in climate). Nonetheless, the highest overall biomass for the wet to dry translocation was produced on the mediterranean dry slope with intermediate soil moisture. However, on the same mediterranean dry slope, biomass was almost zero for soil translocated the other way round (from drier to wetter). Diversity after 24 months was unaffected by micro-climatic change, but soils transplanted toward the drier climate yielded a plant community with increased diversity.

Conclusion

Our results showed direction and magnitude of climate change but also the response factor that is studied matters to detect direction-dependent responses; i.e., species richness had a linear and reversible response. However, the response of biomass depended on the origin of the transplanted material (soil and plant community), indicating history dependence (hysteresis). This emphasizes that responses to unidirectional climate manipulation experiments may not be able to capture the entire nature of the response of plant communities to climate change.

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来源期刊
Journal of Vegetation Science
Journal of Vegetation Science 环境科学-林学
CiteScore
6.00
自引率
3.60%
发文量
60
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.
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