Framework / Assessment Oregon Indicators of Sustainable Forest Management Summary This indicator will provide tabular and graphical information about forest vegetation. A forest vegetation map is also desirable, but such a map will be a product of future assessment work and not a product of this indicator. The composition, diversity, and structure of vascular plants are important factors in assessing biological diversity of forested ecosystems. Vegetation is the source of primary production and a primary determinant of habitat for many species.