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Forestry Advance Access published online on April 24, 2009
Forestry, doi:10.1093/forestry/cpp014
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© Institute of Chartered Foresters, 2009. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

A volume change index for forest growth and sustainability

Paul C. Van Deusen1,* and Francis A. Roesch2

1 National Council for Air and Stream Improvement, 600 Suffolk Street, Lowell, MA 01854, USA
2 US Department of Agriculture, Forest Service, Southern Research Station, 200 WT Weaver Boulevard, Asheville, NC 28804-3454, USA

* Corresponding author. E-mail: PVanDeusen{at}ncasi.org


  Abstract

A volume change index is suggested that is derived from growth components that can be estimated from remeasured plots. The new index incorporates more information than the traditional growth over removals ratio. The new index directly indicates whether the standing volume will be increasing or decreasing if current conditions persist, whereas the ratio of growth over removals obscures the impact of mortality. The details of estimating the components of growth are discussed with regard to interpreting the new index. The effect of spatial scale on the index is explored and a variance estimator is suggested. The new index is estimated from US Department of Agriculture Forest Service annual inventory data for two example applications. The first application looks at spatial trends in the index. The second application applies the index to a mill working circle.


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