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field_methods:twig_length_measurement [2009/09/10 16:55]
jasonkarl
field_methods:twig_length_measurement [2012/03/08 15:42] (current)
jgillan
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 +<​sup>​[[:​bug_reporting|Report a bug, broken link, or incorrect content]]</​sup>​[[http://​methods.landscapetoolbox.org|{{ field_methods:​methodsguide3.png?​220x120|}}]]
 ====== Browse Removal - Twig Length Measurement Method ====== ====== Browse Removal - Twig Length Measurement Method ======
- ​[[http://​www.rangelandmethods.org/​about/​get_involved|{{:​abstract_in_dev.gif|}}]]+ ​[[http://​www.landscapetoolbox.org/​about/​get_involved|{{:​abstract_in_dev.gif|}}]]\\ 
 +written by Karen Colson and Jason Karl 
 + 
 +===== Method Type ===== 
 +Utilization - Quantitative 
 + 
 +===== Other Names ===== 
 +None known
  
 ===== Description and Uses ===== ===== Description and Uses =====
Line 9: Line 17:
 ===== Advantages and Limitations ===== ===== Advantages and Limitations =====
 From the Utilization Studies and Residual Measurements manual: From the Utilization Studies and Residual Measurements manual:
-  - Percent utilization determined by measurement is more accurate than +  - Percent utilization determined by measurement is more accurate than utilization determined by ocular observation. This method is useful in determining the amount of use made on browse plants by livestock and the amount of use made on the same browse plants by wildlife, wild horses, and/or wild burros. The degree of direct forage competition among different kinds of animals can be determined where there are discrete periods of use by different animals. Growth and use indexes can also be determined. 
-utilization determined by ocular observation. This method is useful in +  - Good utilization estimates can be obtained with this method even though twig volume is not uniformly distributed along the length of twigs. The results will vary with species due to twig growth characteristics. 
-determining the amount of use made on browse plants by livestock and the +  - The method is not reliable on species that do not clearly exhibit annual twig growth, such as sagebrush and serviceberry. It is also not reliable in areas of the Southwest where annual twig growth may be masked by almost continuous growth or erratic seasonal growth after rains. 
-amount of use made on the same browse plants by wildlife, wild horses, +  - The time and expense needed for gathering data are doubled because the measurements must be made twice a year.
-and/or wild burros. The degree of direct forage competition among different +
-kinds of animals can be determined where there are discrete periods of +
-use by different animals. Growth and use indexes can also be determined. +
-  - Good utilization estimates can be obtained with this method even though +
-twig volume is not uniformly distributed along the length of twigs. The +
-results will vary with species due to twig growth characteristics. +
-  - The method is not reliable on species that do not clearly exhibit annual +
-twig growth, such as sagebrush and serviceberry. It is also not reliable in +
-areas of the Southwest where annual twig growth may be masked by +
-almost continuous growth or erratic seasonal growth after rains. +
-  - The time and expense needed for gathering data are doubled because the +
-measurements must be made twice a year.+
  
  
 ===== Manuals/​Instructions ===== ===== Manuals/​Instructions =====
  
-  *[[http://usda-ars.nmsu.edu/Monit_Assess/monitoring_main.php|Monitoring Manual for Grasslands, Shrublands, ​and Savanna Ecosystems ​(Herrick et al. 2005)]]. +  *[[http://www.blm.gov/nstc/library/​pdf/​utilstudies.pdf|Utilization Studies ​and Residual Measurement:​ Interagency Technical Reference ​(BLM 1999)]]. 
  
  
 ===== Technical and Application References ===== ===== Technical and Application References =====
  
 +  * Jensen, Charles H. and George W. Scotter. 1977. A comparison of twiglength and browsed-twig methods of determining browse utilization. J. Range Manage. 30:64-67.
 +  * Ferguson, Robert B. and Michael A. Marsden. 1977. Estimating overwinter bitterbrush utilization from twig diameter-length-weight relations. J.  Range Manage. 30:231-236.
 +  * Smith, Arthur D. and Philip J. Urness. 1962. Analyses of the Twig Length Method of determining utilization of browse. Utah State Dept. of Fish & Game. Publication No. 62-9. 35p.
 +  * U.S. Department of Interior Bureau of Land Management. 1984. Rangeland Monitoring - Utilization Studies, TR4400-3.
  
 ===== Similar Approaches ===== ===== Similar Approaches =====
 +Other browse removal methods include:
 +  * [[Cole Browse Method]]
 +  * [[Extensive Browse Method]]
  
 +Related utilization and residue measurement methods include:
 +  * [[Stubble Height]]
 +  * [[Paired Plot Method]]
 +  * [[comparative_yield_method]]
 +  * [[Utilization - Grazed Class Method]]
 +  * [[Herbaceous Removal-Height-Weight Method]]
 +  * [[Herbaceous Removal-Actual Weight Method]]
 +  * [[Herbaceous Removal-Ocular Method]]
  
 ===== Additional Information ===== ===== Additional Information =====
  
-  * Printable data forms for the Tree Density method ​can be downloaded from the [[http://usda-ars.nmsu.edu/monit_assess/data_forms/line_point_intercept_dataform.pdf|Jornada Experimental Range Monitoring ​and Assessment Site]].+  * Printable data forms for the Twig Length Measurement Method ​can be found on pages 30-33 of the [[http://www.blm.gov/nstc/library/pdf/​utilstudies.pdf|Utilization Studies ​and Residual Measurement Methods Interagency Technical Reference]]. 
 + 
 +===== Web Search Results ===== 
 +<​html>​ 
 +<script src="​http://​www.google.com/​jsapi"></​script>​ 
 + 
 +    <script language="​Javascript"​ type="​text/​javascript">//<​![CDATA[ 
 +      google.load('​search',​ '​1.0'​);​ 
 +       
 +      function OnLoad() { 
 + 
 +        var searchString = '"​browse removal twig measurement"';​ 
 +        // create a tabbed mode search control 
 +        var searchControl = new google.search.SearchControl();​ 
 +        options = new google.search.SearcherOptions();​ 
 +        options.setExpandMode(google.search.SearchControl.EXPAND_MODE_OPEN);​ 
 +        options.setRoot(document.getElementById("​web_results"​));​ 
 +        searchControl.addSearcher(new google.search.WebSearch(),​ options); 
 + 
 +        var drawOptions = new google.search.DrawOptions();​ 
 + 
 +        options2 = new google.search.SearcherOptions();​ 
 +        options2.setExpandMode(google.search.SearchControl.EXPAND_MODE_OPEN);​ 
 +        searchControl.addSearcher(new google.search.BookSearch(),​ options2);​ 
 +        searchControl.draw(document.getElementById("​book_results"​),​ drawOptions);​ 
 + 
 +        // execute searches 
 +        searchControl.execute(searchString);​
  
-  * An Excel version of the Tree Density method data form that automatically calculates cover percentages can also be found at the [[http://​usda-ars.nmsu.edu/monit_assess/data_forms/​LPI_automated_calc_7Nov2006.xls|Jornada Experimental Range Monitoring and Assessment Site]].+      } 
 +      google.setOnLoadCallback(OnLoad,​ true); 
 +    ​//]]
 +    </​script>​
  
 +    <table border="​0">​
 +       <​tr><​td width="​50%">​ <div class="​search-control"​ id="​book_results">​Loading...</​div>​
 +           </​td>​
 +           <​td width="​50%">​ <div class="​search-control"​ id="​web_results">​Loading...</​div>​
 +           </​td>​
 +       </​tr>​
 +    </​table>​
 +</​html>​
  
 +===== Discussion/​Comments =====
 +<​sub>​**You must have an account and be logged in to post or reply to the discussion topics below. [[http://​wiki.landscapetoolbox.org/​doku.php/​Home?​do=login&​sectok=db3676cff5bcd873b609b4e582432d73|Click here]] to login or register for the site.**</​sub>​
 +~~DISCUSSION| ~~
  
field_methods/twig_length_measurement.1252623357.txt.gz · Last modified: 2012/02/22 13:28 (external edit)