Environmental change shapes understory plant diversity and dominance in boreal forests

Xinli Chen (), Peter B. Reich, Xin Chen, Masumi Hisano, Anthony R. Taylor, Daijiang Li and Scott X. Chang ()
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Xinli Chen: Zhejiang A&F University, State Key Laboratory for Development and Utilization of Forest Food Resources
Peter B. Reich: University of Michigan, Institute for Global Change Biology, and School for Environment and Sustainability
Xin Chen: University of Maryland Center for Environmental Science, Appalachian Lab
Masumi Hisano: Hiroshima University, Graduate School of Advanced Science and Engineering
Anthony R. Taylor: University of New Brunswick, Faculty of Forestry and Environmental Management
Daijiang Li: University of Wisconsin-Madison, Department of Botany
Scott X. Chang: Zhejiang A&F University, State Key Laboratory for Development and Utilization of Forest Food Resources

Nature Communications, 2025, vol. 16, issue 1, 1-13

Abstract: Abstract Ongoing environmental change threatens ecosystems worldwide, yet little is known about its effect on understory plant diversity, which underpins ecosystem functioning and sustainability. Here, we use Canada’s National Forest Inventory database to evaluate decade-long changes in local plant diversity within understory communities. Species richness of shrubs and bryophytes increases by 8 and 11% per decade, while species evenness of herbs and bryophytes declines by 14 and 8%, respectively. Temporal increases in species richness and declines in species evenness are both associated with rising temperature, nitrogen deposition, water availability, and increased temperature seasonality. Additionally, the proportion of bryophyte biomass increases, whereas that of shrub biomass decreases over time, with the effects of temperature seasonality and water availability on these temporal shifts strongly dependent on overstory basal area. Species richness is positively associated with biomass across shrubs, herbs, and bryophytes, suggesting that changes in diversity alter understory biomass distribution under environmental changes. Contrary to the common view that climate warming uniformly reduces biodiversity, our findings show that understory communities undergo complex and dynamic shifts in plant diversity and composition. We suggest that environmental change-driven shifts in resource availability and heterogeneity may shape understory composition and species dominance, ultimately influencing forest ecosystem function.

Date: 2025
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DOI: 10.1038/s41467-025-65633-y

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