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Ecological Intelligence

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Ecological Intelligence / Subject

edge effects

Peer-reviewed North America

Retention patches protect some habitat while creating new forest edges

Evidence
Peer-reviewed
Geography
Modeled managed forest landscapes, North America
System
Forest harvesting; aggregate retention; edge effects

WHAT THE EVIDENCE SAYS

Researchers used approximately 105,000 simulated managed-landscape configurations to examine aggregated retention under fixed harvested-area assumptions. The simulations found that placing 20 percent of harvested stands into retention could increase the area influenced by forest edges by roughly four to 30 percent per harvested area, depending on the chosen edge-distance definition.

WHY IT MATTERS / OUR READ

Keeping live forest inside a working landscape has value, but a stand-level retention percentage is not a landscape design. Patch shapes, connected cores and exposure of neighboring stands can materially change which ecological conditions remain.

CAVEATS / UNCERTAINTY

These are geometric model outcomes, not measured wildlife, carbon or forest-growth responses. Edge-effect distances and harvesting assumptions determine the estimates; no universal prescription follows from this calculation.

SOURCE

Landscape Ecology · forest retention and edge-modeling study
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A landscape model quantifies why the geometry of retained forest matters as well as the retained percentage.

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Peer-reviewed Asia

China — Most forests are edge habitat now, and human-made edges reach deeper

Evidence
Peer-reviewed
Geography
China
System
Fragmented forests

WHAT THE EVIDENCE SAYS

By 2023, nearly 88% of China’s forests were within one kilometre of an edge and about 95% of edges adjoined anthropogenic land uses. Human-created edges had stronger effects on productivity and temporal stability, with stability declines extending roughly 210 metres inward.

WHY IT MATTERS / OUR READ

Fragmentation metrics based only on patch area or edge length miss the ecological depth of human-adjacent edge effects. Infrastructure, agriculture and development can alter the functioning of nominally retained forest well inside mapped boundaries.

CAVEATS / UNCERTAINTY

Remote-sensing indicators of productivity and stability do not capture all biodiversity responses, and edge depth varies with climate, canopy structure and adjacent land use.

SOURCE

Communications Earth & Environment · Original evidence
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Nearly 88% of China’s forest area lies within one kilometre of an edge, with anthropogenic edges producing stronger effects on productivity and stability.

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