Data for: Forest Development and financial outcomes under shelterwood and clearcut regimes in mixed stands

Data from 12 different locations in Sweden, where the experiment was set up in the early 1990s in a randomized split-plot. At each location, one block was set up with four treatments. The treatments tested were clearcutting and shelterwood (mainly pine) with and without mechanical site preparation. So, the four treatments were; 1) clearcutting without mechanical site preparation, 2) clearcutting with mechanical site preparation, 3) shelterwood without mechanical site preparation and 4) shelterwood with mechanical site preparation. In all treatments, 2 500 spruce seedlings ha-1 were planted with the hopes that a mixed forest of naturally regenerated pine and planted spruce would be established. The experiment was measured after a few years and articles were published (Nilsson U, Örlander G, Karlsson M (2006) Establishing mixed forests in Sweden by combining planting and natural regeneration—Effects of shelterwoods and scarification. Forest Ecol Manag 237: 301-311, https://doi.org/10.1016/j.foreco.2006.09.053 and Karlsson M, Nilsson U (2005) The effects of scarification and shelterwood treatments on naturally regenerated seedlings in southern Sweden. Forest Ecol Manag 205: 183-197, https://doi.org/10.1016/j.foreco.2004.10.046). Now, almost 30 years later, 12 locations have been measured again to compare differences in production and land expectation value between the treatments. Data was collected in the field in sample plots with a radius of 5.64 m. Between 2-4 sample plots per treatment and location were laid out. The number of sample plots differs as it was difficult to determine where the outer bounds of certain treatments were located. The data collected in each sample plot for all trees over 1.3 m was: tree species and breast height diameter. The height of the two tallest trees and the three closest to the centre of the sample plot per tree species was measured using a Vertex. The collected field data was then used as the starting values for the simulations that were made in StandWise, Heureka DSS. The stands were simulated until final harvest, with one or two thinnings performed according to predefined criteria. The final harvests were conducted when the cash flow or the land expectation value culminated. For more detailed information about the method, see the scientific article.