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Why do mixed-species forest plantings often store more carbon than single-species plantations?

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wetland restoration — ecological restoration Wetland restoration along the Târnava Mică (Tîrnava Mică) River in Romania. A former gravel mine (left) was transformed into a functional wetland (right).

Mixed-species forest plantings often store more carbon than single-species plantations because they facilitate more efficient use of environmental resources through reduced competition and niche differentiation.

When trees of the same species are planted together, they compete intensely for the same subset of resources—such as specific nutrients, water, and light—because they share identical adaptive traits and requirements. In contrast, mixed-species forests contain trees with diverse life histories and physiological needs. By partitioning resources in both time and space, these varied species can more fully exploit the available habitat.1

For example, different species may have varying light requirements, with some adapted to rapid growth in high-light environments and others capable of persisting in the shade. Furthermore, trees can occupy different vertical layers of the canopy, allowing for a more stratified and productive structure that maximizes light capture. By minimizing the intensity of intraspecific competition and maximizing the collective ability of the forest to utilize its environment, mixed-species plantings generally achieve higher levels of productivity and, consequently, greater carbon storage.21