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Inventory

(58)
i
2018/26
(57)
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2009/17

Topic

area
basal area
forest plots

Classification

(10)
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Altitude above sea level in classes of 400 m. Reference: Digital height model DHM 25 from Swisstopo
(60)
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Altitudinal vegetation belts in the system used in the guidelines for monitoring the sustainability and performance of protection forests (NaiS; Frehner et al. 2005), reduced to six classes. The variable represents a simplification of the NaiS altitudinal vegetation belts with ten classes (NAISHSTKOMB) in which the classes «hyperinsubric» and «colline» are merged with «colline with beech» to form the class «hyperinsubric and colline» and the class «lower montane» with «upper montane» and «lower/upper montane» to form the class «lower and upper montane». The information is based on the altitudinal vegetation belts determined by experts (accessible forest sample plots of NFI4 on the 1.4-km network; Arge Frehner et al. 2020), as well as on the altitudinal vegetation belts modelled for the period 1981-2010 (other sample plots; Zischg et al. 2021).
(8)
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Sample plots without/with gaps ≥100 m² from canopy edge to canopy edge that intersect with the interpretation area (50 × 50 m), classified according to the area of the largest gap into five classes. Reference: aerial photo interpretation
(6)
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Measure of inter-tree crowding of the tree crowns in a stand. Reference: Field Survey (MID 266: Schlussgrad)
(12)
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Proportion of the ground area covered by tree crowns according to the aerial photo interpretation – in five 20-percent classes. The percentage is calculated using the 25 grid points on the interpretation area (50 × 50 m). Reference: aerial photo interpretation
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region

(115)
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Demarcation of Switzerland into five regions (Jura, Plateau, Pre-Alps, Alps and Southern Alps) with relatively uniform growth and timber production conditions. The production regions were established by the Federal Office of Forestry long before the first National Forest Inventory (NFI1, 1983-1985). With a small exception along Lake Geneva, the boundaries of the production regions still follow the municipal boundaries of the time. Unlike the NFI, the Forestry Statistics of the Federal Statistical Office don't use the production regions as demarcation but rather the forestry zones, whose boundaries are somewhat different.
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evaluation area

(115)
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Area designated in both NFI4 (2009-2017) and NFI5 (2018-2026) as «accessible forest without shrub forest», a.f.w.s.f. i.e. «forest without shrub forest» that can be accessed on foot and is situated in a forest that the cantons designated «protection forest» in 2022 according to the harmonised criteria of SilvaProtect-CH (Losey & Wehrli 2013).
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grid

(115)
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Sub-grids 1, 2, 3, 4 and 5 of the field surveys on the sampling grid with a mesh size of 1.4 km (base grid).
search result: 115 entries on 7 pages
LFI5 2018/26
production region
forest area
altitude (in 400 m classes)
protection forests (2022): a.f.w.s.f. NFI4/NFI5
1.4 km grid, subgrids 1-5
column total, %
1000 ha
LFI5 2018/26
production region
forest area
altitudinal vegetation belts (NaiS; 6 classes)
protection forests (2022): a.f.w.s.f. NFI4/NFI5
1.4 km grid, subgrids 1-5
column total, %
1000 ha
LFI5 2018/26
production region
forest area
forest type (12 classes)
protection forests (2022): a.f.w.s.f. NFI4/NFI5
1.4 km grid, subgrids 1-5
column total, %
1000 ha
LFI5 2018/26
production region
forest area
slope (in 20% classes)
protection forests (2022): a.f.w.s.f. NFI4/NFI5
1.4 km grid, subgrids 1-5
column total, %
1000 ha
LFI5 2018/26
production region
forest area
time of last treatment (in 10-year classes)
protection forests (2022): a.f.w.s.f. NFI4/NFI5
1.4 km grid, subgrids 1-5
column total, %
1000 ha
LFI5 2018/26
production region
forest area
altitudinal vegetation belts (NaiS; 6 classes)·degree of cover (aerial photo, 5 classes)
protection forests (2022): a.f.w.s.f. NFI4/NFI5
1.4 km grid, subgrids 1-5
column total, %
subtotal, %
1000 ha
LFI5 2018/26
production region
forest area
altitudinal vegetation belts (NaiS; 6 classes)·degree of cover of established regeneration
protection forests (2022): a.f.w.s.f. NFI4/NFI5
1.4 km grid, subgrids 1-5
column total, %
subtotal, %
1000 ha
LFI5 2018/26
production region
forest area
altitudinal vegetation belts (NaiS; 6 classes)·regeneration cover
protection forests (2022): a.f.w.s.f. NFI4/NFI5
1.4 km grid, subgrids 1-5
column total, %
subtotal, %
search result: 115 entries on 7 pages

Citation

Abegg, M.; Ahles, P.; Allgaier Leuch, B.; Cioldi, F.; Didion, M.; Düggelin, C.; Fischer, C.; Herold, A.; Meile, R.; Rohner, B.; Rösler, E.; Speich, S.; Temperli, C.; Traub, B.,
2023: Swiss national forest inventory NFI. Result tables and maps of the NFI surveys 1983–2022 (NFI1, NFI2, NFI3, NFI4, NFI5.1–5) on the internet. [Published online 30.05.2023] Available from the World Wide Web <http://www.lfi.ch/resultate/> . Birmensdorf, Swiss Federal Research Institute WSL
https://doi.org/10.21258/1769925