Browsing by Author "Walters, David K."
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Item Analysis of the Cloquet Forestry Center continuous forest inventory 1959-1990.(University of Minnesota, 1994-12) Tuhus, Erik H.; Walters, David K.; Ek, Alan R.This report describes procedures, analysis, and results from a study of the Cloquet Forestry Center continuous forest inventory (CFI). The CFI on the property was established in 1959 and plots have since been measured five additional times. Summary tables are presented for individual covertypes and for covertype aggregates, for all measurement years. Trends in covertype acreage, growing stock, age class, and size class distribution for the forest over the 31-year period are also discussed. This study was conducted using an Rbase 4.5 relational database on a PC. A description of Rbase command files developed and used in the study and necessary editing and changes made to the database are included as appendices.Item Regeneration imputation models and analysis for forests in Minnesota.(University of Minnesota, 1996-05) Ek, Alan R.; Robinson, Andrew P.; Radtke, Philip J.; Walters, David K.Tabular imputation models were developed and tested to estimate post-harvest forest stand characteristics in Minnesota. The models were based on a sorting of statewide inventory plot data into sets of tables containing estimates of number of trees and basal area per acre by covertype, diameter classes, and species for young post-harvest stands. The primary bases for sorting within the sets of tables were stand age input data to existing growth and yield models. Analysis of these tables indicated that basal area increased rapidly for young stands and then began to level off as stand ages approached 20 years; furthermore, the variability within the tables decreased as forest stands matured. Implications for alternative methods of implementing the models are also discussed.