Mixed-Species Forests Increase Carbon Absorption

Smithsonian research finds diverse forests grow faster through complex canopy structures that capture more light.

Updated on Oct. 28, 2026 in Environmental

Mixed-Species Forests Increase Carbon Absorption

Live Poll

Should local reforestation projects prioritize planting diverse tree species over single-species plots?

A 2025 study reveals that mixed-species forests achieve significantly higher productivity compared to single-species plantations. By utilizing diverse tree shapes, these forests develop more complex canopies that absorb light more efficiently.

Why it matters

The findings suggest that biodiversity plays a critical role in forest carbon sequestration rates. Complex canopy structures allow trees to fit together more efficiently, directly increasing their growth potential.

Researchers studied 70 plots across 60 acres, comparing growth rates against canopy complexity metrics derived from LiDAR data. Twelve-species plots exhibited a 71% increase in canopy complexity compared to those with only one species.

The players

Smithsonian Environmental Research Center

This institution conducts long-term scientific research on coastal ecosystems and environmental change.

Smithsonian Conservation Biology Institute

This organization focuses on global conservation programs and the study of endangered species and habitats.

National Ecological Observatory Network

This facility provides continental-scale data to the scientific community for ecology and climate research.

The details

Researchers at the Smithsonian Environmental Research Center in Edgewater, Maryland, and the Smithsonian Conservation Biology Institute in Front Royal, Virginia, conducted the study. The team analyzed approximately 17,850 trees planted in plots containing 1, 4, or 12 distinct species to compare their growth performance.

2016: Liang et al. published a global forest study.
2025: Fahey et al. published the findings in the journal Ecology.

The Big Picture

This study shifts the scientific consensus by identifying specific structural mechanisms that drive productivity in diverse ecosystems. It builds upon the National Ecological Observatory Network data to replace simpler models of forest growth with a framework focused on canopy geometry.

The findings could lead to more effective reforestation practices that maximize carbon capture for climate mitigation efforts. Improved planting strategies may help optimize land-use policies by prioritizing tree species diversity in future environmental projects.

The takeaway

Forests with higher species variety can outperform monoculture plantations in both growth speed and carbon sequestration. Readers interested in conservation can support local reforestation efforts that prioritize native biodiversity to enhance natural carbon capture.