Negative biotic soil-effects enhance biodiversity by restricting potentially dominant plant species in grasslands
Negative biotic soil-effects enhance biodiversity by restricting potentially dominant plant species in grasslands
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DOI：
10.1016/j.ppees.2015.03.002
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发表时间：
2015-01-01
影响因子：
3.6
通讯作者：
Joshi, Jasmin
中科院分区：
文献类型：
--
作者：
Heinze, Johannes;Bergmann, Joana;Joshi, Jasmin
土壤微生物与植物之间的相互作用对植物的适宜性起着至关重要的作用，因此也对植物群落组成和生物多样性起着至关重要的作用。然而，很少有人知道生物植物土壤相互作用如何影响当地的优势和丰富的植物物种，以及是否特定的植物分类或功能群的差异，这种生物土壤效应的影响。在两个温室实验中，我们测试了33个草地物种不同的个体大小和本地丰度的生物土壤效应。我们假设，大型植物，不是当地占主导地位（尽管他们的大小相关的竞争优势，使他们能够潜在地遮蔽竞争对手）是最强烈的限制，负面的生物土壤效应。我们采样土壤在温带草原土地利用强度梯度的两端，以解释土地利用强度对生物土壤效应的调节作用，正如假设的那样，大型但非优势物种（尤其是草）与小型和丰富的植物物种相比，经历了更多的负面生物土壤效应。土地利用强度对牧草和草本植物的影响形成鲜明对比，导致在管理不那么集中的草地上对牧草产生更负面的生物土壤效应。我们的结论是，生物土壤的影响有助于控制潜在的优势植物，从而使物种共存和生物多样性，特别是在物种丰富的不太密集的管理草原。(C)2015 Geobotanisches Institut ETH，Stiftung Ruebel.由Elsevier GmbH出版。All rights reserved.
Interactions between soil microorganisms and plants can play a vital role for plant fitness and therefore also for plant community composition and biodiversity. However, little is known about how biotic plant soil interactions influence the local dominance and abundance of plant species and whether specific taxonomic or functional groups of plants are differentially affected by such biotic soil-effects. In two greenhouse experiments, we tested the biotic soil-effects of 33 grassland species differing in individual size and local abundance. We hypothesized that large plants that are not locally dominant (despite their size-related competitive advantage enabling them to potentially outshade competitors) are most strongly limited by negative biotic soil-effects. We sampled soils at the opposite ends of a gradient in land-use intensity in temperate grasslands to account for putative modulating effects of land-use intensity on biotic soil-effects.As hypothesized, large, but non-dominant species (especially grasses) experienced more negative biotic soil-effects compared with small and abundant plant species. Land-use intensity had contrasting effects on grasses and herbs resulting in more negative biotic soil-effects for grasses in less intensively managed grasslands. We conclude that biotic soil-effects contribute to the control of potentially dominant plants and hence enable species coexistence and biodiversity especially in species-rich less intensively managed grasslands. (C) 2015 Geobotanisches Institut ETH, Stiftung Ruebel. Published by Elsevier GmbH. All rights reserved.