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Understanding the ecology of soil aggregation: interrelationships between arbuscular mycorrhizal fungi and associated microbiota

了解土壤聚集的生态学：丛枝菌根真菌与相关微生物群之间的相互关系

基本信息

批准号：
58427310
负责人：
Professor Dr. Matthias C. Rillig, Ph.D.
金额：
--
依托单位：
Arbeitsgruppe Ökologie der Pflanzen
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2008
资助国家：
德国
起止时间：
2007-12-31 至 2013-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/58427310?language=en
关键词：
Understanding ecology soil aggregation interrelationships

项目摘要

Soil aggregation is a crucial aspect of agricultural sustainability and ecosystem functioning. Arbuscularmycorrhizal fungi (AMF) have a prominent role in the process of soil aggregation. As a ubiquitous and significant portion of soil microbial biomass AMF also exert potentially strong influences on the microbial communities associated with the mycorrhizal symbiosis. Our central hypotheses are that (a) soil microbial communities will be changed by AMF as a function of AMF species and mycorrhizosphere compartment; (b) and that these altered microbial communities are functionally significant in soil aggregation.The soil zone under influence by the mycorrhizal symbiosis (the mycorrhizosphere) can be conceptualized to consist of the hyphosphere (the soil under influence of AMF hyphae in soil) and the rhizosphere (the AMFinfluenced zone surrounding the root). The remaining soil is referred to as bulk soil. In this proposal we are explicitly distinguishing among these compartments, since different potential mechanisms for microbial community change act in each zone. Further, there are significant differences among AMF species/ isolates in their influences on plants and soil (in particular aggregation), and hence we propose a comparative approach using several isolates of AMF. Soil microbial communities will be assessed by DGGE analyses. Soil aggregation will be assessed by measuring soil aggregate distribution and water stability.This research will enhance our understanding of the microbial ecology of the AMF symbiosis and our knowledge of organism interactions in soil aggregation.

土壤团聚是农业可持续性和生态系统功能的一个重要方面。丛枝菌根真菌（Arbuscularmycorrhizal fungi，AMF）在土壤团聚过程中具有重要作用。AMF作为土壤微生物生物量的重要组成部分，对与菌根共生相关的微生物群落也有潜在的影响。我们的中心假设是：（a）AMF改变了土壤微生物群落，这是AMF种类和菌根区室数量的函数（B），这些改变的微生物群落在土壤聚集中具有重要的功能。（菌根）可以被概念化为由菌丝层组成。AMF菌丝影响的土壤）和根际（AMF影响的根周围区域）。剩余的土壤称为散装土壤。在这个建议中，我们明确区分这些隔间，因为不同的潜在机制，微生物群落变化的行为在每个区域。此外，有显着差异AMF物种/菌株在其对植物和土壤的影响（特别是聚集），因此，我们提出了一个比较的方法，使用几个菌株的AMF。将通过DGGE分析评估土壤微生物群落。通过测定土壤团聚体的分布和水稳定性来评估土壤团聚体。这项研究将加深我们对AMF共生的微生物生态学的理解，以及我们对土壤团聚体中生物相互作用的认识。