https://orcid.org/0000-0002-5840-3051
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David Ray, Robert Seymour, Shawn Fraver, John-Pascal Berrill, Laura Kenefic, Nicole Rogers, Aaron Weiskittel, Relative Density as a Standardizing Metric for the Development of Size-Density Management Charts, Journal of Forestry, Volume 121, Issue 5-6, September/November 2023, Pages 443–456, https://doi.org/10.1093/jofore/fvad029
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Abstract
Stand density management is central to achieving diverse silvicultural objectives. Decision-support tools in this domain range from expert opinion to sophisticated computer models that vary by forest type, region, and organization. The graphical frameworks represented by density management diagrams (DMDs) and stocking guides (SGs), collectively called size-density management charts (SDMCs), are well established and balance quantitative rigor with user accessibility. Regional differences in species composition and site quality are known to influence maximum size-density relationships, historically limiting the development of reliable charts. Advances in statistical modeling and data availability are overcoming this issue and should encourage more widespread use. We briefly review the history of SDMCs and propose the adoption of relative density based on stand density index as a logical metric for linking the DMD and SG formats. Examples of SDMC construction and use are illustrated for spruce-fir stands in Maine, USA.
Study Implications: Recognition of the importance of stand density management has increased in recent years owing to its potential to address threats such as susceptibility to catastrophic wildfires and forest health issues exacerbated by environmental stress. Natural resource managers will benefit from adopting a language around density management that is both biologically grounded and consistent. A relative density framework is compatible with the two primary types of size-density management charts and thus meets this objective well. Relative density provides an ideal launching point for articulating levels of stand density, or stocking, to meet diverse management objectives determined under relevant socioecological constraints.
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