Modeling Regions
Modeling Region
225 : Oregon and California Klamaths
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OverviewThis modeling region encompasses the Klamath province in both Oregon and California. The province is influenced by unique geologic conditions. In many areas, serpentine soils formed by the accretion of rocks onto the continent control the native vegetation, which is dominated by mixed-conifer and mixed conifer/hardwood forest such as Douglas-fir/tanoak/madrone. The province is characterized by historically high fire frequencies (0-35-year fire-return intervals), and fire suppression has resulted in areas with significant accumulations of fuel, shifts in species composition, and changes in stand structure. Forests are highly fragmented as a result of dry climate, poor soils, and past harvest practices, as well as ownership patterns, especially in areas of 'checkerboard' ownership. Slightly over half of the province in Oregon is federally managed. In California, National forests cover about three-quarters of the province.
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Map Products
| GNN species-size map and accuracy assessment report | FINAL | 2007 | 03/03/2010 |  (85.8 MB) |
Plot Database
LEMMA offers a number of data tables associated with
this region. Many of the tables can be downloaded by clicking
on the plot database link below, but the larger tables are
only available upon request. The database contains plot data
for all modeling regions within a project. Documentation for these
tables is embedded in the Data Dictionary section below.
| Plot database (MS Access format) and associated documentation | FINAL | N/A | 05/05/2010 | (25.7 MB) |
Data Dictionary
| dbo | TREE_BA_CROSSTAB | Plot by tree species basal area cross-tabulation table | Included in plot database download |
| dbo | TREE_COV_CROSSTAB | Plot by tree species percent cover cross-tabulation table | Included in plot database download |
| dist | SPPSZ_ATTR_NWFP | Plot information and stand level summary variables attached to GNN grids by default for the NWFP project | Included in plot database download |
| dist | SPPSZ_ATTR_ALL | Plot information and all stand level summary variables (for attaching to GNN grids) | Included in plot database download |
| dbo | TREE_LIVE | Live tree piece-level data | Contact us |
| dbo | TREE_SNAG | Standing dead (snag) piece-level data | Contact us |
| dbo | TREE_CWD | Coarse woody debris piece-level data | Contact us |
| dbo | UNDERSTORY | Understory (non-tree) tally data (cover by species on plots) | Contact us |
| dbo | SPECIES_CLASS | Species classification (family, genus, species, etc.) | Included in plot database download |
Associated Projects
This table lists projects whose study areas partially overlap the region
of interest. Click on the link to be taken to the associated project
pages.
