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Understanding the relative role of ecological neutrality and niche based competition in structuring the soil community: a comparative field study on arbuscular mycorrhizal fungi and microarthropods

了解生态中立和基于生态位的竞争在构建土壤群落中的相对作用：丛枝菌根真菌和微型节肢动物的比较实地研究

基本信息

批准号：
186274974
负责人：
Dr. Stefan Hempel, since 8/2013
金额：
--
依托单位：
School of Biology and Environmental Science
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2011
资助国家：
德国
起止时间：
2010-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/186274974?language=en
关键词：
Understanding relative role ecological neutrality

项目摘要

Soil biota represents a unique opportunity for testing competing models of community assembly since it is characterized by an astonishing diversity. Surprisingly, there are only a few studies that directly addressed neutral (demographic stochasticity with limited dispersal) vs. niche (competition with environmental heterogeneity) processes in the soil. We will study the assemblages formed by arbuscular-mycorrhizal fungi (AMF), collembolans and oribatid mites in a natural grassland and we will test four hypotheses: (1) at the smallest scale of the study (the single plant canopy) community is randomly assembled (ecological drift); (2) at the plot scale (≈ 1m), distance between plants is the main predictor of community similarities (dispersal limitation); (3) at larger scales (transects, 5-10 m), that encompass environmental heterogeneities (e.g. soil texture and moisture), species composition varies randomly (niche overlap); (4) at all scales geographic distances is sufficient to predict species distribution. Soil will be characterized by key variables such as moisture, pH and organic C. AMF communities will be assessed molecularly, in the roots and the soil, while microarthropods will be assessed morphologically. There are no comparative studies that addressed in detail the different scales at which assemblages of different organisms may diverge. This is a topical issue, given the functional role of AMF and microarthropods in the ecosystem (e.g. carbon cycling). This research will enhance our understanding of processes shaping natural communities.

土壤生物群是一个独特的机会，测试竞争模式的社区大会，因为它的特点是惊人的多样性。令人惊讶的是，只有少数研究直接解决中性（人口随机性与有限的扩散）与生态位（与环境异质性的竞争）在土壤中的过程。本研究对天然草地丛枝菌根真菌（AMF）、弹尾虫和甲螨的组合进行了研究，并检验了以下四个假设：（1）在最小研究尺度上（单个植物冠层）群落是随机组合的，（2）在样地尺度（1 m）上，植物间距离是群落相似性的主要预测因子（3）在较大尺度（5-10米样带），包括环境异质性（如土壤质地和湿度），物种组成随机变化（生态位重叠）;（4）在所有尺度上，地理距离足以预测物种分布。土壤将通过关键变量来表征，如水分、pH值和有机碳。AMF群落将在根部和土壤中进行分子评估，而微型节肢动物将进行形态评估。目前还没有比较研究详细讨论不同生物体组合可能出现分歧的不同尺度。鉴于AMF和微型节肢动物在生态系统中的功能作用（例如碳循环），这是一个热门问题。这项研究将提高我们对自然群落形成过程的理解。