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# Japan — Forest symbioses are shifting with warming and tree disease
- URL: https://intelligence.wildlandseco.com/2026-09-13-japan-mycorrhizal-tree-shift/
- Published: 2026-09-13T17:43:54.000Z
- Updated: 2026-09-13T17:43:54.000Z
- Description: More than 13,000 plots show increasing dominance of arbuscular-mycorrhizal trees, with potential consequences for soil nitrogen retention.
- Author: Benjamin Worlund
- Tags: mycorrhizae, forest soils, tree disease, nutrient cycling, Japan, Land, Climate, #ecological-intelligence, #brief-2026-09-13, #global-radar, #peer-reviewed, #geo-asia

Evidence

Peer-reviewed

Geography

Japanese archipelago

System

Temperate forests and forest soils

## WHAT THE EVIDENCE SAYS

Across more than 13,000 forest plots, arbuscular-mycorrhizal tree dominance increased significantly over roughly 15 years and was associated with climate warming and tree diseases. Higher AM dominance was negatively related to the soil carbon-to-nitrogen stock ratio.

## WHY IT MATTERS / OUR READ

Forest change can reorganize belowground symbioses and nutrient cycling before those changes are obvious in simple canopy-cover metrics. Pest and disease dynamics may therefore alter biogeochemistry at broad scales.

## CAVEATS / UNCERTAINTY

The observational design establishes broad associations rather than proving a single causal pathway from warming or disease to symbiosis shifts. Soil consequences will vary with species composition and site conditions.

## SOURCE

Nature Communications · Original evidence  
[View original evidence ↗](https://www.nature.com/articles/s41467-026-77711-w?ref=intelligence.wildlandseco.com)

From the Morning Brief · 2026-09-13

[Read the full Morning Brief →](https://intelligence.wildlandseco.com/morning-brief-2026-09-13/)