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field_methods:similarity_index [2010/01/15 11:46]
jasonkarl
field_methods:similarity_index [2012/03/08 15:15] (current)
jgillan
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-<​sup>​[[:​bug_reporting|Report a bug, broken link, or incorrect content]]</​sup>​+<​sup>​[[:​bug_reporting|Report a bug, broken link, or incorrect content]]</​sup>​[[http://​methods.landscapetoolbox.org|{{ field_methods:​methodsguide3.png?​220x120|}}]]
 ====== Similarity Index ====== ====== Similarity Index ======
- [[http://​www.rangelandmethods.org/​about/​get_involved|{{:​abstract_in_dev.gif|}}]]+<​HTML>​ 
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 + [[http://​www.landscapetoolbox.org/​about/​get_involved|{{:​abstract_in_dev.gif|}}]]\\ 
 +contributed by Karen Colson and Jason Karl
  
 ===== Method Type ===== ===== Method Type =====
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 Successional status inferred from similarity index on an ecological site. \\ Successional status inferred from similarity index on an ecological site. \\
 <​sub>​Reproduced from BLM Inventory and Monitoring Technical Reference 1734-7 - Ecological Site Inventory</​sub>​ <​sub>​Reproduced from BLM Inventory and Monitoring Technical Reference 1734-7 - Ecological Site Inventory</​sub>​
-^ Similarity Index ^ Successional Status ^+^ Similarity Index ^ Successional Status ^
 | 0-25% | early | | 0-25% | early |
 | 26-50% | mid | | 26-50% | mid |
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 The advantage of similarity index is that it is relatively quick and easy to calculate and provides a good, single number index of how close or far to a management target a site is. One significant limitation of this approach, however, is that it reduces many aspects of ecological functioning of a site down to a single number and may obscure important changes taking place. Consider, for example, Table 9 from Habich'​s (2001) Ecological Site Inventory manual. The advantage of similarity index is that it is relatively quick and easy to calculate and provides a good, single number index of how close or far to a management target a site is. One significant limitation of this approach, however, is that it reduces many aspects of ecological functioning of a site down to a single number and may obscure important changes taking place. Consider, for example, Table 9 from Habich'​s (2001) Ecological Site Inventory manual.
 \\ \\
-{{:​field_methods:​similarity_index.jpg?​width=600|}}\\ +{{:​field_methods:​similarity_index.jpg?​width=400|}}\\ 
-<sub>Taken from Habich (2001), p47</​sub>​ +<sub>Table reproduced ​from Habich (2001), p47</​sub>​ 
-\\+\\ \\
 In this example, the overall similarity index for the mesquite-short grass community is 265/​665=39.8%. However, there is much more mesquite production in this site that would be expected at reference state. The similarity index methods, however, limits the observed mesquite production to the maximum expected for the reference state. In this example, important changes may have taken place (or be taking place) that have caused production of mesquite to be so much higher than expected. ​ In this example, the overall similarity index for the mesquite-short grass community is 265/​665=39.8%. However, there is much more mesquite production in this site that would be expected at reference state. The similarity index methods, however, limits the observed mesquite production to the maximum expected for the reference state. In this example, important changes may have taken place (or be taking place) that have caused production of mesquite to be so much higher than expected. ​
 \\ \\ \\ \\
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     </​table>​     </​table>​
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 +{{tag> field qualitative PNV change potential cover composition}}
  
 ===== Discussion/​Comments ===== ===== Discussion/​Comments =====
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-~~DISCUSSION| ~~+ 
field_methods/similarity_index.1263581181.txt.gz · Last modified: 2012/02/22 13:28 (external edit)