The area covered by negative FVI increased fromApril through June.
In April and May negative FVI values were limited to portions of
the Coast Range, Puget Lowland, Cascades, and Northern Rockies. Then
in June and July negative FVI was widespread across all forested
ecoregions (Fig. 4). Only a small areawas covered by negative FVI values
during August, and these were essentially absent in September. In
October areas of negative FVI again increased in all ecoregions except
the Puget Lowland.
The large area of positive FVI values detected in central Oregon
during August (Fig. 4) is associated with Juniper forests (Table 1). The
proportion of the Juniper FTG with increased vulnerability was nearly
threefold higher in August than in September (Table 1). California
Mixed Conifer had the second highest proportion of area affected by