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Shrubs Surge as Warming Decouples Plant-Fungi Bonds
23 Sep
Summary
- Warming shifted meadows from herbs to shrubs, increasing them by 150%.
- Plant-fungal symbiont interactions were decoupled by sustained warming.
- Ecosystems shifted towards a more conservative resource use strategy.
For nearly three decades, a subalpine meadow in Gothic, Colorado, was artificially warmed to study the long-term effects of increased temperatures. This experiment, conducted at the Rocky Mountain Biological Laboratory, revealed significant ecological transformations.
The warmed plots experienced soils approximately 2°C warmer and earlier snowmelt by 10 to 14 days. Over 29 years, this led to a substantial shift in vegetation, with shrubs increasing by 150% while forbs and grasses declined by about 28%.
This change in plant composition was accompanied by altered belowground dynamics. The abundance of arbuscular mycorrhizal fungi, crucial for plant nutrient uptake, decreased by 48%, and root colonization fell by 17%. Simultaneously, decomposition-associated saprotrophic fungi increased.
Researchers concluded that sustained warming had decoupled the symbiotic relationship between plants and mycorrhizal fungi. The ecosystem transitioned towards a more conservative resource strategy, dominated by shrubs, with altered nutrient cycling and less efficient resource acquisition.
