Data för: Forest Development and financial outcomes under shelterwood and clearcut regimes in mixed stands Data for: Forest Development and financial outcomes under shelterwood and clearcut regimes in mixed stands 2026-182-1 SLU.ltv.2026.4.2.IÄ-9 https://doi.org/10.5878/rmrv-xh80 Swedish National Data Service Svensk nationell datatjänst Landing page Data för: Forest Development and financial outcomes under shelterwood and clearcut regimes in mixed stands Data for: Forest Development and financial outcomes under shelterwood and clearcut regimes in mixed stands 2026-182-1 SLU.ltv.2026.4.2.IÄ-9 https://doi.org/10.5878/rmrv-xh80 10.14214/sf.26005 Nyberg, Therése Nyberg, Therése Holmström, Emma Holmström, Emma Lula, Mikolaj Lula, Mikolaj Adekunle, Hammed Adekunle, Hammed Swedish National Data Service Svensk nationell datatjänst Landing page Elevation Höjd Betula pendula vårtbjörk Betula pubescens glasbjörk Pinus sylvestris tall Picea abies gran 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. Data från 12 olika lokaler i Sverige, där försöket lades ut i början på 90-talet i en randomiserad split-plot. På varje lokal lades ett block ut med fyra behandlingar. Behandlingarna som testades var kalavverkning och skärmträd (av främst tall) med och utan markberedning. Så de fyra behandlingarna var; 1) kalavverkning utan markberedning, 2) kalavverkning med markberedning, 3) skärmträd utan markberedning och 4) skärmträd med markberedning. I alla behandlingar planterades 2 500 granplantor ha-1 med förhoppningarna att en blandskog av naturligt föryngrad tall och planterad gran skulle etableras. Försöket mättes in efter några år och artiklar publicerades (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 samt 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). Nu, knappt 30 år senare har 12 lokaler mätts in igen för att jämföra skillnader i produktion och kalmarksvärde mellan behandlingarna. Data samlades in i fält med provytor på en radie av 5.64 m. Mellan 2-4 provytor per behandling och lokal lades ut. Antalet provytor skiljer sig då det var svårt att avgöra vart vissa behandlingar låg. Det som samlades in på varje provyta för alla träd över 1.3 m var: trädslag och brösthöjdsdiameter. Höjden på de två högsta träden samt de tre närmast provytecentrum per trädslag mättes in med hjälp av en Vertex. Den insamlade fältdatan låg sedan som grund för de simuleringar som gjordes i StandWise, Heureka DSS. Beståndens utveckling simulerades till slutavverkning, där en eller två gallringar utfördes enligt förutbestämda kriterier. Avverkningarna gjordes när kassaflödet eller kalmarksvärdet kulminerade. För mer utförlig beskrivning, se tillhörande vetenskapliga artikel. 2022-11-01 2023-07-31 Sweden Sverige Numeric Data was collected in the field, in circulare plots, with a 5.64 m radius. Tree species and diameter at breast height was taken on all trees above 1.3 m tall. On selected sample trees, the height was also measured.Data was collected in the field, in circulare plots, with a 5.64 m radius. Tree species and diameter at breast height was taken on all trees above 1.3 m tall. On selected sample trees, the height was also measured. Data samlades in i fält, i cirkelprovytor, med en radie på 5.64 meter. Trädslag och brösthöjdsdiameter togs på alla träd med en höjd över 1.3 meter. På utvalda provträd togs mättes också höjden.Data samlades in i fält, i cirkelprovytor, med en radie på 5.64 meter. Trädslag och brösthöjdsdiameter togs på alla träd med en höjd över 1.3 meter. På utvalda provträd togs mättes också höjden. Field/Intervention experimentField/Intervention experiment FältexperimentFältexperiment Access to data through SND. Data are freely accessible. Åtkomst till data via SND. Data är fritt tillgängliga. openAccess Strömvall Nyberg T., Lula M., Adekunle H., Nilsson U., Örlander G., Holmström E. (2026). Forest development and financial outcomes under shelterwood and clearcut regimes in mixed stands. Silva Fennica vol. 60 no. 2 article id 26005. 26 p. https://doi.org/10.14214/sf.26005 Strömvall Nyberg T., Lula M., Adekunle H., Nilsson U., Örlander G., Holmström E. (2026). Forest development and financial outcomes under shelterwood and clearcut regimes in mixed stands. Silva Fennica vol. 60 no. 2 article id 26005. 26 p. https://doi.org/10.14214/sf.26005 10.14214/sf.26005 2026