Appendix 5 benchmark comparisons with the adjusted motyka coefficient




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APPENDIX 5 BENCHMARK COMPARISONS WITH THE ADJUSTED MOTYKA COEFFICIENT

Two comparisons were selected to provide benchmarks for viewing the method and the level of distinction used in my classification. The first used a value of 1.0, representing approximately equal similarities and differences, the second used the average value (0.57) obtained from the comparisons.



EQUAL SIMILARITIES AND DIFFERENCES

An Adjusted Motyka value of 1.0 was obtained for a comparison of the Oak - Bromus sterilis c23 and the Oak - Poa pratensis c29a plant communities, so this was selected as a benchmark that should relate an approximately equal degree of similarities and differences. The following describes the differences and similarities (see Ecosystem Descriptions (5.11) for cover classes):

In c29a, Poa pratensis (introduced Kentucky bluegrass) is on all sites and averages cover class 3 or 4, whereas in c23 it is present at less than the requirement of 0.70.

Bromus sterilis (introduced barren barngrass) is present on all sites, with an average class 4 cover in c23. The species is present on most sites in c29a and averages class 2 cover.

Vicia sativa (introduced common vetch) is present on all sites in c23 and averages class 2 to 3 cover. Vicia sativa is also present on most sites in c29a and averages cover class 3, but is present on less than 0.70 of sites in c23.

Geranium molle (introduced dovefoot geranium) and Vicia hirsuta (introduced hairy vetch) are present on most sites in c29a and average class 2 to 3. Geranium molle is present on less than 0.70 of sites in c23. Vicia hirsuta is present on most sites in c23 and averages class 2 cover.

Elymus glaucus (blue wildrye), Sanicula crassicaulis (Pacific snakeroot) and Galium aparine (cleavers) are present on most sites in c29a and c23, averaging cover class 2. Bromus carinatus (California bromegrass) is present on most sites in both c23 and c29a, averaging class 2 cover in c23 and class 1 to 2 cover in c29a.

Festuca bromoides (introduced annual fescue) is present on most sites in both c23 and c29a, averaging class 2 and 1 cover, respectively.

Hypochaeris radicata (introduced hairy cats ear) is present on most sites in c29a and averages class 1 cover. The species is present on less than 0.70 of the sites of c23.

AVERAGE COMPARISON

However, the mean value of 0.57 from the adjusted Motyka comparisons suggest that the average degree of differences and similarities can be represented by the comparison of c47 Oak- Elymus glaucus and c14 Oak - Carex inops, the middle of three comparisons with this value.



Elymus glaucus (blue wildrye) is present in c47 on all sites and averages cover class 3 to 4. Elymus glaucus is present on most sites in c14 and averages class 2 cover.

Carex inops (long-stoloned sedge) is present on all sites in c14 and averages a cover of class 4. Carex inops is present on most sites in c47 averages cover class 2 to 3.

Vicia sativa (introduced common vetch) is present on all sites in c14 and averages a cover of class 1 to 2. The species is present on less than 0.70 of sites in c47.

Galium aparine (cleavers) is present on most sites in both c14 and c47 and averages class 2 cover.

Sanicula crassicaulis (Pacific snakeroot) is present on most sites in c47 and averages cover class 2. It is present on less than 0.70 of sites in c14.

Ranunculus occidentalis (western buttercup) and Vicia hirsuta (introduced hairy vetch) are present on most sites in c14 and average class 2 cover. Danthonia californica (California oatgrass) and Rumex acetosella (introduced sheep sorrel) on most sites in c14 and average class 1 cover. All these last four species are present at less than 0.70 cover in c47.


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