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Plant-Soil Relationships Diminish Under Major Versus Moderate Climate Change in Subalpine Grasslands
Tyson J Terry1,2, Peter Wilfahrt1,3, Diana R Andrade-Linares4
1Disturbance Ecology and Vegetation Dynamics, Bayreuth Center of Ecology and Environmental Research Bayreuth University Bayreuth Germany.
Ecology and Evolution
|December 15, 2025
Summary
Climate change disrupts the crucial links between plants and soil microbes in grasslands. Major warming and drying cause these relationships to break down, impacting ecosystem stability.
Area of Science:
- Ecology
- Environmental Science
- Soil Science
Background:
- Plant and soil microbial communities interact through resource pools.
- Climate change impacts on these plant-soil relationships are not well understood.
- Subalpine grasslands are sensitive ecosystems potentially impacted by climate shifts.
Purpose of the Study:
- To investigate how climate change (warmer, drier conditions) affects plant-soil relationships in subalpine grasslands.
- To determine the influence of altered climate on plant community structure and soil microbial dynamics.
- To identify potential thresholds in plant-soil interactions under varying climate change scenarios.
Main Methods:
- Downslope translocation of intact soil-plant mesocosms to different elevations.
- Simulating moderate (+1°C, +8 days) and major (+3°C, +21 days) climate change conditions.
- Analyzing soil nutrient pools, microbial community composition, and plant community metrics.
Main Results:
- Soil nutrients and microbial composition were key drivers of plant communities under control and moderate climate change.
- These plant-soil relationships weakened significantly under major climate change.
- Positive correlations between fungi/nitrogen-fixing bacteria and plant growth diminished under severe climate change.
- Evidence of threshold-like responses in plant-soil relationships to climate change intensity.
Conclusions:
- Climate change impacts not only individual components (plants, soil, microbes) but also the ecological coupling between them.
- Major climate change can lead to a breakdown of plant-soil interactions, potentially increasing their independence.
- Subalpine grasslands may exhibit threshold-like ecological shifts in response to climate change, altering ecosystem dynamics.
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