The Tree and Stand Simulator (TASS II) is a biologically-oriented model that simulates the growth of crowns and stems of individual trees in a 3-D growing space. Since the early 1980s, TASS-generated yield tables have provided most of the growth and yield projections used in BC for Timber Supply Analysis and the evaluation of silviculture options. The Table Interpolation Program for Stand Yield (TIPSY) was developed in the early 1990s to manage and rapidly manipulate a large database of TASS tables to meet the needs of yield analysts and silviculturists (Mitchell et al. 2000). However, the potential of TASS II and TIPSY to address complex stands is limited to certain applications (e.g., variable retention (VR) in even-aged stands; Di Lucca et al. 2004). This proposed project will integrate and calibrate new and revised modules (already developed) into a new version (TASS III) designed specifically for the complex structures found in uneven-aged and mixed-species stands, and the complex treatments now being designed and implemented in BC. We expect to deliver the following new features: ? Improved and expanded biological fidelity; ? Realistic and accurate predictions for complex stand structures (e.g., multi-species, multi-cohort, spatially heterogeneous), and complex treatments (e.g., Variable Retention, partial cutting, clearcutting-with-reserves) ; ? Capacity to assess light levels (e.g., light maps before and after partial cutting); ? User friendly and familiar front end similar to TIPSY interface; ? Visual display of thinning/partial harvesting with the capacity to view the trees from different positions above or within the stand, and zoom in on features of interest.
James W. Goudie, Kenneth J. Mitchell, Ian Cameron.
Goudie, James W.. 2006. TASS III: simulating the management, growth and yield of complex stands. Forest Investment Account (FIA) - Forest Science Program. Forest Investment Account Report. FIA2006MR272