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Impact of soil negative feedbacks on plant-species diversity

土壤负反馈对植物物种多样性的影响

基本信息

批准号：
193513063
负责人：
Professorin Dr. Jasmin Joshi
金额：
--
依托单位：
HSR Hochschule für Technik Rapperswil
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2011
资助国家：
德国
起止时间：
2010-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/193513063?language=en
关键词：
Impact soil negative feedbacks plant

项目摘要

Recent research indicates that plant-soil feedbacks may contribute to explaining a large proportion of the relative abundance of plant species in communities and therefore to mechanisms enabling species coexistence. We wish to use the framework of the Biodiversity Exploratories to test two main hypotheses: (1) that plant species with large individual biomass production that are not locally dominant are most strongly limited by specific negative soil feedbacks; and that (2) potentially invasive plant species profit from the absence of specific soil-negative feed-backs in their new habitat. These two hypotheses will be examined by two different sets of plant species, which show the relevant variability in the traits examined, i.e. for (1) biomass and relative abundance, and for (2) occurrence along a South-North gradient in the Exploratories. For these tests, we will use soil microbial samples from all 50 experimental grassland plots. In greenhouse experiments, we will additionally provide mechanistic resolution regarding the nature of the soil (negative) feedback, by examining different soil fractions, including arbuscular mycorrhizal fungi, root pathogenic fungi, and a microbial mish (mixture of pathogens and saprobes). Additionally, we will test FTIR, a new and high-throughput fast analysis of root material, which could subsequently be utilized also for other projects in the Exploratories that are faced with large sample numbers. With our large-scale and phylogenetially diverse screening, we hope to make an unprecedented contribution to the study of mechanisms enabling plant species coexistence and biodiversity; this knowledge can be integrated with other soil biota and plant-focused projects in the Exploratories.

最近的研究表明，植物-土壤反馈可能有助于解释群落中植物物种相对丰富的很大比例，从而有助于实现物种共存的机制。我们希望利用生物多样性探索的框架来检验两个主要假设：(1)具有大量个体生物量而不是局部占优势的植物物种最强烈地受到特定的土壤负反馈的限制；(2)潜在的入侵植物物种受益于它们新的栖息地没有特定的土壤负反馈。这两个假设将由两组不同的植物物种来检验，这两组植物在所考察的性状中显示了相关的变异性，即(1)生物量和相对丰度，(2)在探索实验室中沿着南北梯度发生。在这些测试中，我们将使用来自所有50个试验草地的土壤微生物样本。在温室实验中，我们还将通过检查不同的土壤组分，包括丛枝菌根真菌、根部病原真菌和微生物MISH(病原体和腐生菌的混合物)，提供关于土壤(负)反馈性质的机械解决方案。此外，我们将测试FTIR，这是一种新的、高通量的牙根材料快速分析方法，随后也可以用于探索实验室中面临大量样本的其他项目。通过我们的大规模和系统发育多样化的筛选，我们希望为植物物种共存和生物多样性的机制研究做出前所未有的贡献；这些知识可以与探索实验室中的其他土壤生物群和植物项目相结合。