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# Multiple global-change pressures do not add up neatly—and can reverse expected effects on grassland stability
- URL: https://intelligence.wildlandseco.com/2026-09-15-global-change-interactions-grassland-stability/
- Published: 2026-09-15T14:01:31.000Z
- Updated: 2026-09-15T14:01:31.000Z
- Description: A 13-year factorial experiment shows CO₂, nitrogen, warming and reduced rainfall interact in strongly non-additive, time-dependent ways.
- Author: Benjamin Worlund
- Tags: global change, ecosystem stability, grassland, multifactor experiment, species asynchrony, Climate, Land, Methods, #ecological-intelligence, #brief-2026-09-15, #priority-read, #peer-reviewed, #geo-north-america, #edition-lead

Evidence

Peer-reviewed

Geography

Cedar Creek, Minnesota, USA

System

Temperate experimental grassland

## WHAT THE EVIDENCE SAYS

In the long-running TeRaCON experiment, researchers manipulated elevated CO₂, nitrogen enrichment, warming and reduced rainfall in all combinations for 13 years. Single drivers changed the temporal stability of aboveground productivity through different pathways, while combined effects frequently departed from additive expectations and sometimes changed direction through time. Across treatments, species asynchrony was the dominant correlate of stability, with soil moisture and functional composition contributing secondarily.

## WHY IT MATTERS / OUR READ

The practical warning is methodological as much as ecological: responses measured one driver at a time, or over only a few years, can misrepresent how real ecosystems behave under simultaneous pressures. Stability emerges from interactions among resources, traits and community dynamics—not from a simple sum of stressors.

## CAVEATS / UNCERTAINTY

This is one long-term temperate grassland experiment, and the stability metric is temporal mean productivity divided by its variability; a treatment that increases this metric is not necessarily healthier or more biodiverse. Results should not be generalized unchanged to forests, wetlands or other systems.

## SOURCE

Nature Ecology & Evolution · Original evidence  
[View original evidence ↗](https://www.nature.com/articles/s41559-026-03190-3?ref=intelligence.wildlandseco.com)

From the Morning Brief · 2026-09-15

[Read the full Morning Brief →](https://intelligence.wildlandseco.com/morning-brief-2026-09-15/)