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The use of [[allometry]] is widespread in [[forestry]] and [[forest ecology]]. In order to develop an allometric relationship there must be a strong relationship and an ability to quantify this relationship between the parts of the subject measured and the other quantities of interest.<ref>Smith, W.B., and G.J. Brand. 1983 Allometric biomass equations for 98 species of herbs, shrubs, and small trees. Research note NC-299. USDA Forest Service, North Central Forest Experiment Station, St. Paul, MN 8p.</ref> Also when developing this equation one must play in factors which affect tree growth such as age, species, site ___location, etc.<ref>Avery and Burkhart. Forest Measurements. Copyright 2002 by McGraw-Hill Companies Inc. New York.</ref> Once all these guidelines are met, one may attempt to develop an allometric equation.
===Assessment of forest biomass and carbon stocks===
In 2013, the [[Food and Agriculture Organization of the United Nations]] launched [http://www.fao.org/forestry/databases/allometric-equation/en/ GlobAllomeTree], a web-based platform designed to improve global access to tree allometric equations and support forest and climate-change project developers, researchers, scientists and foresters to assess forest volume and biomass, and carbon stocks. Jointly developed by [[FAO]], the [[CIRAD|French Research Centre CIRAD]] and [[Tuscia University|Tuscia University of Italy]], the GlobAllomeTree platform provides a consistent and harmonized database of tree and stand volume and biomass allometric equations; software to compare equations and assess variables of interests, such as volume, biomass and carbon stocks; access to scientific research information on allometric equations; and access to tutorials, manuals and documentation supporting the development and use of tree allometric equations.
In 2012, FAO and CIRAD published a manual for building tree volume and biomass allometric equations for students, technicians or researchers working to assess forest resources such as volume, biomass and carbon stocks for commercial, bioenergy or climate change mitigation purposes<ref>[http://www.fao.org/docrep/018/i3058e/i3058e.pdf Picard N., Saint-André L., Henry M. 2012. Manual for building tree volume and biomass allometric equations: from field measurement to prediction. Food and Agricultural Organization of the United Nations, Rome, and Centre de Coopération Internationale en Recherche Agronomique pour le Développement, Montpellier]</ref>.
===Methodology===
First thing to do is select a group of some subject (for forestry: trees). Then measure several easily measured attributes such as DBH, height, species, etc. Graph the results and perform a regression analysis and transform some of the variables until a correct [[Regression analysis|regression]] is found.
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