Shifts in Ectomycorrhizal Fungal Communities and Exploration Types Relate to the Environment and Fine-Root Traits Across Interior Douglas-Fir Forests of Western Canada

Summary

This research examined how different types of beneficial fungi that live on tree roots respond to changes in climate and soil conditions across forests in western Canada. The study found that different fungi thrive in different environments – some prefer warmer conditions while others do better in colder areas. This has important implications for forest health and adaptation to climate change. Key impacts on everyday life: • Understanding these fungi-tree relationships helps predict how forests will cope with climate change • This knowledge can help forest managers choose appropriate trees and maintain healthy forests • Healthy forests provide essential ecosystem services like clean air, water filtration, and carbon storage • The findings help explain why some trees may struggle when transplanted to new environments • This research contributes to developing climate-resilient forestry practices

Background

Ectomycorrhizal fungi (EMF) play a dominant role in temperate and boreal forest ecosystems, controlling plant acquisition of soil resources and soil carbon dynamics. Large-scale studies examining EMF responses across biogeographic gradients are needed to assess their role in mediating current and predicted future alterations in forest ecosystem processes.

Objective

To assess the extent of environmental filtering on interior Douglas-fir ectomycorrhizal fungal communities across regional gradients in precipitation, temperature, and soil fertility in interior Douglas-fir dominated forests of western Canada. The study also examined relationships between fine-root traits and mycorrhizal fungal exploration types by combining root and fungal trait measurements with next-generation sequencing.

Results

Temperature, precipitation, and soil C:N ratio affected fungal community dissimilarity and exploration type abundance but had no effect on α-diversity. Fungi with rhizomorphs or proteolytic abilities dominated communities in warmer and less fertile environments. Ascomycetes or shorter distance explorers were favored in colder/drier climates where soils were richer in total nitrogen. No evidence was found for a link between root and fungal resource foraging strategies at the regional scale.

Conclusion

Environmental filtering of ectomycorrhizal fungal communities is potentially related to co-evolutionary history between Douglas-fir populations and fungal symbionts, suggesting success of interior Douglas-fir as climate changes may be dependent on maintaining strong associations with local communities of mycorrhizal fungi. The lack of evidence for root-fungi trait relationships supports the need for a mycorrhizal symbiosis framework that is independent of root trait frameworks.
Scroll to Top