An integrated approach to deriving site-specific black spruce regeneration standards by management objective

Abstract

The objectives of this study were to develop and subsequently demonstrate a mathematical compatible approach for deriving site-specific regeneration standards by yield objective for use in black spruce ( Picea mariana (Mill.) B.S.P.) management. The approach quantitatively links mean point-density estimates derived from regeneration surveys to future yields through the use of a stand density management diagram (SDMD). Specifically, the SDMD was used as a simulation model to derive periodic yield estimates for quadratic mean diameter, mean volume and merchantable volume for a range of initial density and site conditions commonly observed within naturally regenerating black spruce seedling populations. Yield prediction equations were developed employing mean point-density and dominant height as independent variables and subsequently summarized within a graphical, functional and algorithmic framework. The practical utility of the approach was demonstrated by considering regeneration assessment situations commonly encountered in operational settings: (1) estimating site-specific yields at rotation age given mean point-density estimates, and conversely, (2) determining site-specific mean point-density values required to attain specified yield objectives at rotation age. Although the operational utility of the approach is restricted to central insular Newfoundland due to data base limitations, the concepts and analytical framework underlying the approach are of general applicability.