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Table 2 Woodland key habitats recorded in the NFI since 2003, following the Complementary Hot-spot Inventory (CHI) methodology, with the main criteria for defining and mapping whole or parts of the 0.2 ha plot as a habitat polygon. The rightmost column gives the occurrence of the respective CHI habitats as of 2016 (inventory period 2014–2018)

From: A century of National Forest Inventory in Norway – informing past, present, and future decisions

CHI habitat Main criteria for inclusion in polygon Occurrence in productive forest (% of area)
Standing deadwood • ≥ 40 standing dead trees·ha−1 with dbh ≥10 cm
• Distance to other dead trees ≤15 m
Downed deadwood • ≥ 40 downed dead trees·ha−1 with diameter at root end ≥10 cm
• Distance to other downed dead trees ≤15 m
Trees with nutrient-rich bark • Occurrence of maple (Acer platanoídes L.) or any tree species with bark lichens of the lobarion group
• ≥ 20 trees·ha−1 of any of the above categories (60 in West and North Norway)
• Distance to other trees with nutrient-rich bark ≤25 (15) m
Trees with pendant lichens • ≥ 100 trees·ha−1 with at least 10 individuals/groups of pendant lichens of more than 10 cm length within 1 m2 of the vertical tree crown area
• Occurrence of trees with lichens of the species Evernia divaricata (L.) Ach. or Usnea longissima Ach.
• Only assessed for the lower 5 m of the tree
Deciduous boreal trees in late successional stage • ≥ 40 trees·ha−1 with dbh ≥20 cm of any of the species Populus tremula L., Sorbus aucuparia L., Alnus incana L., Salix caprea L., Prunus padus L., or Betula spp.
• Northern Norway: only P. tremula is considered
Old trees • ≥ 30 standing old trees·ha−1
• Minimum age for spruce/pine = 150/200 yrs.
• Deciduous trees are included dependent on dbh and species (minimum dbh is 30–40 cm for boreal species and 40–50 cm for noble hardwoods)
• Distance to other old trees ≤20 m
Luxuriant ground vegetation • Nutrient-rich forms of selected vegetation types sensu (Larsson 2005) 3.1