Rare trees were missing from the youngest and oldest size classes in a Chinese watershed forest

Thirty-six plots in a major water-diversion intake area found that rare woody species occupied a narrow structural window.

Wild Lands Ecological Intelligence Editor
Wild Lands Institute · 14 October 2026

Evidence: Peer-reviewed
Geography: Nanyang, Henan, China
System: Temperate–subtropical transition forest; reservoir catchment

WHAT THE EVIDENCE SAYS

Surveys counted 2,210 woody stems belonging to 39 species in 36 permanent plots. Common species occupied most diameter and height classes, while rare woody taxa were largely clustered at intermediate sizes and absent from the largest classes, suggesting weak recruitment or progression.

WHY IT MATTERS / OUR READ

Presence on a species list is not the same as a viable age structure; conservation plans should look for regeneration and canopy progression.

CAVEATS / UNCERTAINTY

Diameter-class patterns are a snapshot, not followed individuals. Recruitment failure, competition and gap dependence need repeated plots before attributing causes.

SOURCE

Frontiers in Ecology and Evolution — primary forest plot study
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