Microbial Community Structure and Function of Soil Following Ecosystem Conversion from Native Forests to Teak...

Area of Science:

• Ecology
• Soil Science
• Microbiology

Background:

• Soil microbial communities are crucial for forest ecosystem functioning.
• Impacts of converting diverse native forests to monoculture plantations on soil microbes are not well understood.

Purpose of the Study:

• To test if converting native forests to Teak (Tectona grandis) monoculture plantations reduces soil microbial diversity.
• To investigate changes in soil microbial community structure and function.

Main Methods:

• Examined soils from Teak plantations and adjacent native forests in Trinidad.
• Used Illumina sequencing for bacterial 16S rRNA and fungal ITS regions.
• Analyzed phospholipid fatty acid (PLFA) profiles and extracellular enzyme activity (EEA).

Main Results:

• No significant effect of Teak conversion on bacterial or fungal species richness, evenness, or EEA.
• Multivariate analyses revealed significant differences in microbial community composition between Teak and native forest soils.
• Specific bacterial phyla (Cyanobacteria, Nitrospirae) were more abundant in native forests, while others (TM7, WS6) were more abundant in Teak plantations.
• Arbuscular mycorrhizal fungi (AMF) abundance was higher in Teak soils.

Conclusions:

• Conversion to Teak monoculture did not reduce overall soil microbial diversity indices.
• Significant shifts in the composition of specific bacterial taxa and AMF occurred following forest conversion.
• Forest type significantly influences soil microbial community structure, even without changes in diversity metrics.