Olympic Habitat Development Study
US FOREST SERVICE

 

Station 5 - Edges

At Stations 2, 3 and 4 we were talking about what happened in the center of a skip, a gap or the thinned matrix away from an edge with another part of the variable-density thinning treatment. But one of the interesting aspects of VDT (variable-density thinning) is that there are lots of edge effects. Thus, the gaps have a "halo" effect with more vegetation development in the thinned matrix around the edges of the gaps than further away. More vegetation develops along the edge of a skip than in the center because of tree removal in the adjacent thinned matrix. Gaps were purposely not located directly adjacent to skips.


 

Gaps have a halo effect in the surrounding thinned matrix.
Vegetation growth is higher around edges of skips than in the center. Gaps have a halo effect in the surrounding thinned matrix. Bracken Fern (Pteridium aquilinim)is one of the sun-loving species that benefits from the edge effect.
Gaps have a halo effect in the surrounding thinned matrix.