Plant-soil-microbial interactions mediate vegetation succession in retreating glacial forefields

Area of Science:

• Ecology
• Microbiology
• Plant Science

Background:

• Global warming causes glacial retreat, creating new land for plant colonization.
• Soil microbial communities are crucial for plant succession but specific drivers remain unclear.

Purpose of the Study:

• To investigate how plant-soil-microbial interactions shape primary plant succession in a glacial retreat chronosequence.
• To identify key microbial groups influencing plant establishment and competition during succession.

Main Methods:

• Quantified plant-soil-microbial interactions by comparing plant biomass under different soil conditions (sterilized vs. live) and competition types (inter- vs. intra-specific).
• Assessed plant species performance across a glacial retreat chronosequence (5-100 years).

Main Results:

• Early-stage soils (5-10 years) had negative impacts on most plants, while mid- (30-40 years) and late-stage (80-100 years) soils showed positive effects.
• Salicaceae species from mid-successional habitats thrived across all stages, inhibiting later plant establishment.
• Microbial drivers shifted from saprophytic fungi (early) to bacterial and arbuscular mycorrhizal fungi (mid), then to ectomycorrhizal fungi (late).

Conclusions:

• Microbial community turnover significantly influences plant-soil interactions.
• These interactions accelerate primary plant succession in recently deglaciated environments.
• Understanding microbial dynamics is key to predicting ecosystem recovery post-glaciation.