Similar Processes but Different Environmental Filters for Soil Bacterial and Fungal Community Composition Turnover on a Broad Spatial Scale

Spatial scaling of microorganisms has been demonstrated over the last decade. However, the processes and environmental filters shaping soil microbial community structure on a broad spatial scale still need to be refined and ranked. Here, we compared bacterial and fungal community composition turnovers through a biogeographical approach on the same soil sampling design at a broad spatial scale (area range: 13300 to 31000 km2): i) to examine their spatial structuring; ii) to investigate the relative importance of environmental selection and spatial autocorrelation in determining their community composition turnover; and iii) to identify and rank the relevant environmental filters and scales involved in their spatial variations. Molecular fingerprinting of soil bacterial and fungal communities was performed on 413 soils from four French regions of contrasting environmental heterogeneity (Landes

近十年来，微生物的空间尺度效应已得到学界证实。然而，在大空间尺度下塑造土壤微生物群落结构的相关过程与环境过滤因子，仍有待进一步细化厘清与优先级排序。本研究依托统一的土壤采样设计，采用生物地理学研究方法，在13300至31000平方千米的空间范围（面积区间：13300~31000 km²）内，对比分析了细菌与真菌群落的组成更替：（i）探究两类群落的空间构建格局；（ii）解析环境筛选与空间自相关在调控群落组成更替过程中的相对重要性；（iii）明确并排序参与其空间变异的关键环境过滤因子与相关空间尺度。本研究对法国4个环境异质性存在显著差异的区域（朗德[Landes]）的413份土壤样品，开展了土壤细菌与真菌群落的分子指纹分析。