The Unseen Reservoir: How Dark Diversity Shapes Forest Productivity in China

Chinese ecologists have introduced a compelling new dimension to the understanding of forest ecosystems by integrating the concept of “dark diversity” into biodiversity-ecosystem functioning (BEF) research. Conducted across 414 plots in the temperate forests of northeastern China, the study moves beyond the traditional focus on locally observed species to include those absent from a site but present in the regional species pool. The findings, published in the Journal of Ecology, reveal that this hidden potential—the dark diversity—is a powerful, if indirect, force in shaping forest productivity.

The team, led by researchers using data from the Donglingshan forest dynamics plot in Beijing, discovered that the size of the regional species pool was the single best predictor of annual productivity. Intriguingly, a metric called “community completeness”—the degree to which the local community realizes the regional pool—was a stronger predictor of productivity over a five-year period. Using structural equation modelling, they found that dark diversity does not directly boost productivity; rather, it exerts its influence indirectly by modulating observed diversity and stand structure, such as basal area. This process, in turn, is shaped by climatic conditions and human disturbance.

Why it matters:
This approach reframes ecosystems not as static collections of species, but as dynamic systems constrained by environmental filters and regional context. For conservation and climate adaptation strategies in China and beyond, accounting for dark diversity could improve predictions of how forests will respond to disturbances or changing climates, guiding more effective reforestation and management efforts.

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