{"@context": "https://schema.org", "@type": "Dataset", "@id": "https://doi.org/10.5878/k65t-qb32", "identifier": [{"@type": "PropertyValue", "unitCode": "DOI", "value": "https://doi.org/10.5878/k65t-qb32"}, {"@type": "PropertyValue", "unitCode": "https://www.rikstermbanken.se/termposter/1848/diarienummer", "unitText": "principalRegistrationNumber", "value": "SLU.srh.2023.4.1-30"}, {"@type": "PropertyValue", "unitCode": "DOI", "value": "https://doi.org/10.5878/ktjd-ch26"}], "version": "1", "name": [{"@value": "Sample tree data from the Swedish National Forest Inventory", "@language": "en"}, {"@value": "Data f\u00f6r provtr\u00e4d fr\u00e5n Riksskogstaxeringen", "@language": "sv"}], "description": [{"@value": "The data set include a list of sample trees  \u226510 cm DBH from the Swedish National Forest Inventory. Individual sample trees measured and cored within a ten metre wide transect during the 1923-1929 survey or circular sample plots during the 1953-1962, 1983-1992, and 2013-2022 surveys are included. The 10 cm threshold was used to exclude smaller diameter trees measured on small parts of sections or plots. Variables include cluster and plot ID, tree species, diameter, tree age at breast height and total tree age, land-cover class and expansion factors for estimation of number of trees and volumes. The current NFI is based on an annual sample of about 20,000 circular plots, grouped into clusters, of which about 12,000 are surveyed in the field each year. Data for additional sample trees and more variables for individual sample trees can be obtained from the Swedish National Forest Inventory. More details are presented in the article, see\n\nJacobsson, Jonas, Fridman, Jonas, Axelsson, Anna-Lena, Milberg, Per (2025). An aging population? A century of change among Swedish forest trees. Forest Ecology and Management. 580:122509. https://doi.org/10.1016/j.foreco.2025.122509\n\nThe data file contains 17 columns and 384790 rows. ", "@language": "en"}, {"@value": "Datasetet inneh\u00e5ller en f\u00f6rteckning \u00f6ver provtr\u00e4d \u226510 cm DBH fr\u00e5n Riksskogstaxeringen. Enskilda provtr\u00e4d som uppm\u00e4tts och borrats inom en tio meter bred transekt under unders\u00f6kningen 1923-1929 eller cirkul\u00e4ra provytor under unders\u00f6kningarna 1953-1962, 1983-1992 och 2013-2022 ing\u00e5r. Tr\u00f6skelv\u00e4rdet p\u00e5 10 cm anv\u00e4ndes f\u00f6r att utesluta tr\u00e4d med mindre diameter som endast registrerades p\u00e5 delytor. Variablerna inkluderar bland annat kluster- och provyte-ID, tr\u00e4dslag, diameter, tr\u00e4d\u00e5lder i br\u00f6sth\u00f6jd och total tr\u00e4d\u00e5lder, markt\u00e4ckeklass samt expansionsfaktorer f\u00f6r uppskattning av antal tr\u00e4d och volymer. Den nuvarande riksskogstaxeringen bygger p\u00e5 ett \u00e5rligt urval av cirka 20 000 cirkul\u00e4ra provytor, grupperade i kluster, varav cirka 12 000 inventeras i f\u00e4lt varje \u00e5r. Data f\u00f6r ytterligare provtr\u00e4d samt fler variabler f\u00f6r enskilda provtr\u00e4d kan erh\u00e5llas fr\u00e5n Riksskogstaxeringen. F\u00f6r mer detaljerad information se: \n\nJacobsson, Jonas, Fridman, Jonas, Axelsson, Anna-Lena, Milberg, Per (2025). An aging population? A century of change among Swedish forest trees. Forest Ecology and Management. 580:122509. https://doi.org/10.1016/j.foreco.2025.122509\n\nDatafilen omfattar 17 kolumner och 384790 rader. 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