The role of local environment and geographical distance in determining community composition of arbuscular mycorrhizal fungi at the landscape scale
The role of local environment and geographical distance in determining community composition of arbuscular mycorrhizal fungi at the landscape scale
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DOI：
10.1038/ismej.2012.127
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发表时间：
2013-03-01
期刊：
影响因子：
11
通讯作者：
Bending, Gary D.
中科院分区：
文献类型：
--
作者：
Hazard, Christina;Gosling, Paul;Bending, Gary D.
丛枝真菌在指导陆地生态系统的功能方面具有重要作用，但对其地理分布知之甚少。通过调查丛枝菌根真菌（AMF）在景观尺度上的分布以及环境因子和地理距离对确定群落组成的影响，验证了Baas-Becking假说（“万物皆有，但环境选择”）。在代表不同土地利用和土壤类型的爱尔兰的40个地理上分散的地点，三叶草和多年生黑麦草根AMF社区进行了评估。现场采样和实验室生物测定，AMF社区的特点是使用18 S rRNA末端限制性片段长度多态性。AMF的景观尺度分布受当地环境的驱动。AMF群落组成的影响，非生物变量（pH值，降雨量和土壤类型），但不是土地利用或地理距离。白三叶和L.多年生植物支持AMF的对比社区，和社区殖民每个植物物种是一致的牧场栖息地和距离。此外，L.多年生AMF群落按土壤类型在牧场栖息地内分组。这是迄今为止规模最大、最全面的AMF分布研究。我们的研究结果支持Baas-Becking假设在景观尺度上，并证明了当地环境对AMF群落组成的强烈影响。The ISME Journal（2013）7，498-508; doi：10.1038/ismej.2012.127; 2012年10月25日在线发表
Arbuscular fungi have a major role in directing the functioning of terrestrial ecosystems yet little is known about their biogeographical distribution. The Baas-Becking hypothesis ('everything is everywhere, but, the environment selects') was tested by investigating the distribution of arbuscular mycorrhizal fungi (AMF) at the landscape scale and the influence of environmental factors and geographical distance in determining community composition. AMF communities in Trifolium repens and Lolium perenne roots were assessed in 40 geographically dispersed sites in Ireland representing different land uses and soil types. Field sampling and laboratory bioassays were used, with AMF communities characterised using 18S rRNA terminal-restriction fragment length polymorphism. Landscape-scale distribution of AMF was driven by the local environment. AMF community composition was influenced by abiotic variables (pH, rainfall and soil type), but not land use or geographical distance. Trifolium repens and L. perenne supported contrasting communities of AMF, and the communities colonising each plant species were consistent across pasture habitats and over distance. Furthermore, L. perenne AMF communities grouped by soil type within pasture habitats. This is the largest and most comprehensive study that has investigated the landscape-scale distribution of AMF. Our findings support the Baas-Becking hypothesis at the landscape scale and demonstrate the strong influence the local environment has on determining AMF community composition. The ISME Journal (2013) 7, 498-508; doi:10.1038/ismej.2012.127; published online 25 October 2012