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Topic
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Proportion of sample plots that meet the forest definition of NFI, i.e. are covered by "forest without shrub forest" or "shrub forest".
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Classification
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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 three classes. The variable represents a simplification of the NaiS altititudinal vegetation belts in six classes (NAISHSTKOMB6KL) in which the class «hyperinsubric and colline» is mearged with «submontane» to form the class «hyperinsubric, colline, submontane», the class «lower and upper montane» with «high montane» to form the class «montane» and the class «subalpine» with «upper subalpine» to form the class «subalpine». 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).
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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).
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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
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Classification of the forest according to the forest decision and accessibility into the three classes «accessible forest without shrub forest», «inaccessible forest without shrub forest» and «shrub forest».
(6)
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Sample plots with/without current recreational use within a radius of 100 m around the sample plot centre, classified according to visitor frequency as a measure of the intensity of recreational use. No recreational use: <10 persons/year; very low intensity: <1 person/day; low: 1-10 persons/day; moderate: 11-100 persons/day; high: 101-500 persons/day; very high: >500 persons/day based on the entire year or the relevant season, taking into account all types of recreational use. Reference: Forest Service Survey (MID 330: Intensität der aktuellen Erholungsnutzung)
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region
(49)
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Demarcation of Switzerland used in NFI for protection forest analyses. The six protection forest regions were derived from the economic regions by combining individual regions according to natural and statistical criteria.
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evaluation area
(49)
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Area accessible on foot that meets the NFI's definition of forest in both NFI4 (2009-2017) and NFI5 (2018-2026), i.e. was either «forest without shrub forest» or «shrub forest».
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grid
(49)
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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).
LFI5 2018/26
protection forest region
proportion of forest plots
intensity of recreational use
accessible forest NFI4/NFI5
1.4 km grid, subgrids 1-5
column total, %
LFI5 2018/26
protection forest region
proportion of forest plots
seasonality of recreational use
accessible forest NFI4/NFI5
1.4 km grid, subgrids 1-5
column total, %
LFI5 2018/26
protection forest region
proportion of forest plots
altitudinal vegetation belts (NaiS; 6 classes)·area of largest gap (5 classes)
accessible forest NFI4/NFI5
1.4 km grid, subgrids 1-5
column total, %
subtotal, %
LFI5 2018/26
protection forest region
proportion of forest plots
area of largest gap (5 classes)·altitudinal vegetation belts (NaiS; 6 classes)
accessible forest NFI4/NFI5
1.4 km grid, subgrids 1-5
column total, %
subtotal, %
LFI5 2018/26
protection forest region
proportion of forest plots
forest type (3 classes)·intensity of recreational use
accessible forest NFI4/NFI5
1.4 km grid, subgrids 1-5
column total, %
LFI5 2018/26
protection forest region
proportion of forest plots
forest type (3 classes)·seasonality of recreational use
accessible forest NFI4/NFI5
1.4 km grid, subgrids 1-5
column total, %
LFI5 2018/26
protection forest region
proportion of forest plots
primary forest function (NFI5): nature conservation·altitudinal vegetation belts (NaiS, 3 classes)·intensity of recreational use
accessible forest NFI4/NFI5
1.4 km grid, subgrids 1-5
column total, %
subtotal, %
LFI5 2018/26
protection forest region
proportion of forest plots
protection forest against avalanches (2022)·area of largest gap (5 classes)
accessible forest NFI4/NFI5
1.4 km grid, subgrids 1-5
column total, %
subtotal, %
LFI5 2018/26
protection forest region
proportion of forest plots
protection forest against channel processes (2022)·area of largest gap (5 classes)
accessible forest NFI4/NFI5
1.4 km grid, subgrids 1-5
column total, %
subtotal, %
LFI5 2018/26
protection forest region
proportion of forest plots
protection forest against hillslope debris flows/landslides (2022)·area of largest gap (5 classes)
accessible forest NFI4/NFI5
1.4 km grid, subgrids 1-5
column total, %
subtotal, %
LFI5 2018/26
protection forest region
proportion of forest plots
protection forest against rockfall (2022)·area of largest gap (5 classes)
accessible forest NFI4/NFI5
1.4 km grid, subgrids 1-5
column total, %
subtotal, %
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