期刊
MICROBIAL ECOLOGY
卷 75, 期 2, 页码 468-478出版社
SPRINGER
DOI: 10.1007/s00248-017-1047-2
关键词
Soil fungi; Illumina metabarcoding; Terrestrial model ecosystems (TME); Soil moisture; Community ecology
资金
- LOEWE - Landes-Offensive zur Entwicklung Wissenschaftlich-Okonomischer Exzellenz of Hesse's Ministry of Higher Education, Research, and the Arts (Senckenberg Biodiversity and Climate Research Centre BiK-F)
Using terrestrial model ecosystems (TMEs), we investigated how reduced moisture conditions impact soil fungal communities from a temperate grassland over the course of an entire season. Starting at about 65% of the soil's maximum water holding capacity (WHCmax), TME soils were adjusted to three moisture levels for 15 weeks: 70% WHCmax, approximating starting conditions, 50% WHCmax, and 30% WHCmax, representing reduced moisture conditions. Diversity and abundances of soil fungi at the start and at the end of the experiment were characterized using Illumina meta-barcoding. Community diversity at the end of the experiment did not differ between experimental moisture levels and was comparable to diversity measures from the field. However, fungal communities did change compositionally in both abundances and presence/absence of species. Analyzing class-level and individual contributions of fungi to these changes revealed that only a minor portion reacted significantly, indicating that most compositional change was likely driven by many consistent small-scale shifts in presence/absences or abundances. Together, our results show that prolonged reduction in soil moisture conditions will trigger compositional changes in soil fungal communities but not necessarily change overall diversity. We highlight the cumulative contribution of minor but consistent changes among community members, as opposed to significant responses of individual species. We also detected a strong general experimental effect on soil fungi that are moved from the field to experimental TMEs, suggesting the importance of acclimatization effects in these communities under laboratory conditions.
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