Abstract
The two storms Vivian (1990) and Lothar (1999) left an area of roughly 9000 ha of fully damaged protection forests in Swiss mountain regions. Given this huge dimension, questions arose on how to manage these areas to keep the protection gap, i.e. the time period with reduced overall protection against natural hazards, short. Quantifications are presented for the stability of lying logs left in place, the frequency of post-disturbance mass movements, and the tree regeneration in windthrow areas. The average height above ground of unsalvaged lying logs decreased from 2.1 m shortly after disturbance to 0.8 m 20 years later. In the period 1990–2014, the number of avalanches in windthrow areas was markedly small, and annual rates of shallow landslides and debris flows in windthrow areas did not differ from rates in comparable undamaged forested areas. Regeneration density rarely exceeded 4000 stems ha−1 20 years post-windthrow at elevations above 1200–1500 m a.s.l. Mean height of tallest trees reached 5.6 m in areas that were cleared and 6.5 m in those left unsalvaged. Trees planted post-windthrow were 1.0–2.4 m taller than naturally regenerated ones. Practitioners rated the protective effect to be acceptable 24 years post-disturbance in only 5 out from 16 observed windthrow areas (31%), with planting trees as the main cause of success. We conclude that in protection forests the regeneration speed after disturbance rarely meets practitioner’s expectations in terms of both stem density and stand structure. However, leaving woody debris from wind disturbance in place proved to replace protective effects for an astonishingly long time. An intensive management with salvage logging, planting and even technical constructions seems therefore only inevitable on windthrown areas where risks seem too high based on hazard, damage potential and possible spread of bark beetles to nearby protection forests. A management alternative applicable to many other cases of windthrown protection forests is to plant trees between lying stems.
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References
Andres N, Badoux A, Hegg C (2015) Unwetterschäden in der Schweiz im Jahre 2014. Rutschungen, Murgänge, Hochwasser und Sturzereignisse. Wasser Energie Luft 107:47–54
Angst C, Volz R (2002) A decision-support tool for managing storm-damaged forests. For Snow Landsc Res 77:217–224
BAFU (2008) Entscheidungshilfe bei Sturmschäden im Wald. Vollzugshilfe für die Wahl der Schadensbehandlung im Einzelbestand. 3. überarbeitete Auflage. Bundesamt für Umwelt, Bern (BAFU), Umwelt-Vollzug 0801:241
Bebi P, Putallaz J-M, Fankhauser M, Schmid U, Schwitter R, Gerber E (2015) Die Schutzfunktion in Windwurfflächen. Schweiz Z Forstwes 166:168–176
Berger F, Rey F (2004) Mountain protection forests against natural hazards and risks: new French developments by integrating forests in risk zoning. Nat Hazards 33:395–404
Brang P (1998) Early seedling establishment of Picea abies in small forest gaps in the Swiss Alps. Can J For Res Rev Can Rech For 28:626–639
Brang P, Lässig R (2000) Restoring protection against natural hazards in European mountain forests after wind disturbance. How much human interference? In: Krishnapillay B et al (eds) Forests and society: the role of research, XXI IUFRO World Congress. Malaysian XXI IUFRO World Congress Organising Committee, vol 1, pp 328–337
Brang P, Schönenberger W, Ott E, Gardiner B (2001) Forests as protection from natural hazards. In: Evans J (ed) The forests handbook. Applying forest science for sustainable management, vol 2. Blackwell Science, Oxford, pp 53–81
Brang P, Schönenberger W, Frehner M, Schwitter R, Thormann J-J, Wasser B (2006) Management of protection forests in the European Alps: an overview. For Snow Landsc Res 80:23–44
Brang P, Bugmann H, Bürgi A, Mühlethaler U, Rigling A, Schwitter R (2008) Klimawandel als waldbauliche Herausforderung. Schweiz Z Forstwes 159:362–373
Brang P, Hilfiker S, Roth B, Wasem U, Wohlgemuth T (2015) Langzeitforschung auf Sturmflächen zeigt Potenzial und Grenzen der Naturverjüngung. Schweiz Z Forstwes 166:147–158
Brang P, Küchli C, Schwitter R, Bugmann H (2016) Waldbauliche Strategien im Klimawandel. In: Pluess AR, Augustin S, Brang P (eds) Wald und Klimawandel. Grundlagen für Adaptationsstrategien. Haupt, Bern, pp 341–365
Bründl M, Rickli C (2002) The storm Lothar 1999 in Switzerland—an incident analysis. For Snow Landsc Res 77:207–216
Bühler U (2005) Jungwaldentwicklung als Eingangsgrösse in die Jagdplanung: Erfahrungen aus dem Kanton Graubünden. Forum Wissen 2005:59–65
Dodet M, Collet C, Frochot H, Wehrlen L (2011) Tree regeneration and plant species diversity responses to vegetation control following a major windthrow in mixed broadleaved stands. Eur J For Res 130:41–53
Dorren LKA, Berger F, Imeson AC, Maier B, Rey F (2004) Integrity, stability and management of protection forests in the European Alps. For Ecol Manag 195:165–176
Dorren LKA, Berger F, Le Hir C, Mermin E, Tardif P (2005) Mechanisms, effects and management implications of rockfall in forests. For Ecol Manag 215:183–195
Dorren LKA, Berger F, Frehner M, Huber M, Kühne K, Métral R, Sandri A, Schwitter R, Thormann J-J, Wasser B (2015) Das neue NaiS-Anforderungsprofil Steinschlag. Schweiz Z Forstwes 166:16–23
Feistl T, Bebi P, Teich M, Bühler Y, Christen M, Thuro K, Bartelt P (2014) Observations and modeling of the braking effect of forests on small and medium avalanches. J Glaciol 60:124–138
Fink AH, Brücher T, Ermert V, Krüger A, Pinto JG (2009) The European storm Kyrill in January 2007: synoptic evolution, meteorological impacts and some considerations with respect to climate change. Nat Hazards Earth Syst Sci 9:405–423
Fischer A, Lindner M, Abs C, Lasch P (2002) Vegetation dynamics in central European forest ecosystems (near-natural as well as managed) after storm events. Folia Geobot 37:17–32
Frehner M, Wasser B, Schwitter R (2005) Nachhaltigkeit und Erfolgskontrolle im Schutzwald. Wegleitung für Pflegemassnahmen in Wäldern mit Schutzfunktion. Bundesamt für Umwelt. Wald und Landschaft BUWAL, Bern
Frey W, Thee P (2002) Avalanche protection of windthrow areas: a ten year comparison of cleared and uncleared starting zones. For Snow Landsc Res 77:89–107
Frey W, Forster B, Gerber W, Graf F, Heiniger U, Kuhn N, Thee P (1995) Risiken und Naturgefahren auf Windwurfflächen. Schweiz Z Forstwes 146:863–872
Fuhr M, Bourrier F, Cordonnier T (2015) Protection against rockfall along a maturity gradient in mountain forests. For Ecol Manag 354:224–231
Gardiner B, Schuck A, Schelhaas M, Orazio C, Blennow K, Nicoli B (2013) What science can tell us 3: living with storm damage to forests. European Forest Institute, Joensuu
Gauquelin X, Courbaud B (2006) Guide des sylvicultures de montagne—Alpes du Nord françaises. Cemagref de Grenoble, Saint-Martin-d'Hères.
Holenstein B (1994) Sturmschäden 1990 im Schweizer Wald. Schrreihe Umw 218:1–41
Hollaus M, Aubrecht C, Hofle B, Steinnocher K, Wagner W (2011) Roughness mapping on various vertical scales based on full-waveform airborne laser scanning data. Remote Sens 3:503–523
Humphreys M, Nettelton I, Leech K (2015) Risk assessment and management of unstable slopes on the national forest estate in Scotland. In: IOP conference series: earth and environmental science, vol 26, pp 012011:1–012011:9
Ishikawa M, Sato S, Kawaguchi T (1968) Stand density of avalanche prevention forest. Annu Rep Tohoku Br For Exp Stn 9:204–211
Jonášová M, Vávrová E, Cudlín P (2010) Western Carpathian mountain spruce forest after a windthrow: natural regeneration in cleared and uncleared areas. For Ecol Manag 259:1127–1134
Kramer K, Brang P, Bachofen H, Bugmann H, Wohlgemuth T (2014) Site factors are more important than salvage logging for tree regeneration after wind disturbance in Central European forests. For Ecol Manag 331:116–128
Kupferschmid AD, Bugmann H (2005) Effect of microsites, logs and ungulate browsing on Picea abies regeneration in a mountain forest. For Ecol Manag 205:251–265
Lachat T, Brändli U-B, Bolliger M (2015) Totholz. In: Rigling A, Schaffer HP (eds) Waldbericht 2015: Zustand und Nutzung des Schweizer Waldes. Bundesamt für Umwelt, Eidg. Forschungsanstalt WSL, Bern, Birmensdorf, pp 80–81
Lauber K, Wagner G, Gygax A (2012) Flora Helvetica, 5th edn. Haupt, Bern
Losey S, Wehrli A (2013) Schutzwald in der Schweiz: Vom Projekt SilvaProtect-CH zum harmonisierten Schutzwald. Bundesamt für Umwelt (BAFU), Bern, p 29
Mather AS, Fairbairn J (2000) From floods to reforestation: the forest transition in Switzerland. Environ Hist 6:399–421
Messier C, Doucet R, Ruel JC, Claveau Y, Kelly C, Lechowicz MJ (1999) Functional ecology of advance regeneration in relation to light in boreal forests. Can J For Res Rev Can Rech For 29:812–823
Meyer-Grass M, Schneebeli M (1992) Die Abhängigkeit der Waldlawinen von Standorts-, Bestandes- und Schneeverhältnissen. In: Internationales Symposion Interpraevent 1992, Bern, pp 443–454
Nováková MH, Edwards-Jonášová M (2015) Restoration of Central-European mountain Norway spruce forest 15 years after natural and anthropogenic disturbance. For Ecol Manag 344:120–130
Olmedo I, Bourrier F, Bertrand D, Berger F, Limam A (2015) Felled trees as a rockfall protection system: experimental and numerical studies. Engineering Geology for Society and Territory, vol 2. Landslide Processes
Olschewski R, Bebi P, Teich M, Wissen Hayek U, Grêt-Regamey A (2012) Avalanche protection by forests: a choice experiment in the Swiss Alps. For Policy Econ 15:108–113
Ott E, Frehner M, Frey HU, Lüscher P (1997) Gebirgsnadelwälder. Ein praxisorientierter Leitfaden für eine standortgerechte Waldbehandlung. Haupt, Bern
Pfister C (2009) Die “Katastrophenlücke” des 20. Jahrhunderts und der Verlust traditionalen Risikobewusstseins. Gaia 18:239–246
Priewasser K, Brang P, Bachofen H, Bugmann H, Wohlgemuth T (2013) Impacts of salvage-logging on the status of deadwood after windthrow in Swiss forests. Eur J For Res 132:231–240
Rammig A, Fahse L, Bugmann H, Bebi P (2006) Forest regeneration after disturbance: a modelling study for the Swiss Alps. For Ecol Manag 222:123–136
Rammig A, Fahse L, Bebi P, Bugmann H (2007) Wind disturbance in mountain forests: simulating the impact of management strategies, seed supply, and ungulate browsing on forest succession. For Ecol Manag 242:142–154
Schelhaas MJ, Nabuurs GJ, Schuck A (2003) Natural disturbances in the European forests in the 19th and 20th centuries. Glob Change Biol 9:1620–1633
Scherrer HU (1993) Projekt zur flächenhaften Erfassung und Auswertung von Sturmschäden. Allg Forstz 48:712–714
Scherrer Ingenieurbüro AG (2001) Sturmschaden inventar Lothar, im Auftrag des Bundesamts für Wald. Schnee und Landschaft BUWAL
Schönenberger W (2002a) Post windthrow stand regeneration in Swiss mountain forests: the first ten years after the 1990 storm Vivian. For Snow Landsc Res 77:61–80
Schönenberger W (2002b) Windthrow research after the 1990 storm Vivian in Switzerland: objectives, study sites, and projects. For Snow Landsc Res 77:9–16
Schönenberger W, Kuhn N, Lässig R (1995) Forschungsziele und -projekte auf Windwurfflächen in der Schweiz. Schweiz Z Forstwes 146:859–862
Schönenberger W, Fischer A, Innes JL (2002) Vivian’s legacy in Switzerland—impact of windthrow on forest dynamics. For Snow Landsc Res 77:1–224
Schönenberger W, Noack A, Thee P (2005) Effect of timber removal from windthrow slopes on the risk of snow avalanches and rockfall. For Ecol Manag 213:197–208
Schüepp M, Schiesser HH, Huntrieser H, Scherrer HU, Schmidtke H (1994) The winterstorm “Vivian” of 27 February 1990: about the meteorological development, wind forces and damage situation in the forests of Switzerland. Theor Appl Climatol 49:183–200
Schwitter R (1996) Schutzwald im Taminatal—Wiederherstellung nach dem Sturm. Forstwiss Centbl 115:273–286
Schwitter R, Sandri A, Bebi P, Wohlgemuth T, Brang P (2015) Lehren aus Vivian für den Gebirgswald—im Hinblick auf den nächsten Sturm. Schweiz Z Forstwes 166:159–167
Seidl R, Schelhaas MJ, Rammer W, Verkerk PJ (2014) Increasing forest disturbances in Europe and their impact on carbon storage. Nat Clim Change 4:806–810
Stoffel L, Schär M, Margreth S, Müller R (2006) Berücksichtigung der Lawinen- und Schneedruckgefährdung bei touristischen Transportanlagen. Bundesamt für Verkehr, Bern
Svoboda M, Fraver S, Janda P, Bace R, Zenáhlíková J (2010) Natural development and regeneration of a Central European montane spruce forest. For Ecol Manag 260:707–714
Teich M, Fischer JT, Feistl T, Bebi P, Christen M, Grêt-Regamey A (2014) Computational snow avalanche simulation in forested terrain. Nat Hazards Earth Syst Sci 14:2233–2248
Usbeck T, Wohlgemuth T, Dobbertin M, Pfister C, Bürgi A, Dobbertin M (2010) Increasing storm damage to forests in Switzerland from 1858 to 2007. Agric For Meteorol 150:47–55
Vacchiano G, Berretti R, Mondino EB, Meloni F, Motta R (2016) Assessing the effect of disturbances on the functionality of direct protection forests. Mt Res Dev 36:41–55
Van Couwenberghe R, Collet C, Lacombe E, Gégout JC (2011) Abundance response of western European forest species along canopy openness and soil pH gradients. For Ecol Manag 262:1483–1490
Vergani C, Chiaradia EA, Bassanelli C, Bischetti GB (2014) Root strength and density decay after felling in a Silver Fir-Norway Spruce stand in the Italian Alps. Plant Soil 377:63–81
Wehrli A, Brang P, Maier B, Duc P, Binder F, Lingua E, Ziegner K, Kleemayr K, Dorren L (2007) Schutzwaldmanagement in den Alpen–eine Übersicht. Schweiz Z Forstwes 158:142–156
Winter MB, Baier R, Ammer C (2015) Regeneration dynamics and resilience of unmanaged mountain forests in the Northern Limestone Alps following bark beetle-induced spruce dieback. Eur J For Res 134:949–968
Wohlgemuth T, Kramer K (2015) Waldverjüngung und Totholz in Sturmflächen 10 und 20 Jahre nach Lothar (1999) und Vivian (1990). Schweiz Z Forstwes 166:135–146
Wohlgemuth T, Kull P, Wüthrich H (2002) Disturbance of microsites and early tree regeneration after windthrow in Swiss mountain forests due to the winter storm Vivian 1990. For Snow Landsc Res 77:17–47
WSL (2001) Lothar: Der Orkan 1999. Ereignisanalyse. Eidg. Forschunganstalt WSL und Bundesamt für Umwelt. Wald und Landschaft BUWAL, Birmensdorf
Zeller E (1982) Stabilitätspflege im Gebirgswald [Stability management in mountain forests]. Bündnerwald 6:304–325
Zielonka T (2006) When does dead wood turn into a substrate for spruce replacement? J Veg Sci 17:739–746
Acknowledgements
The study was supported by Swiss Federal Office of the Environment, by the cantons Aargau, Bern, Freiburg, Grison, Jura, Luzern, Obwalden, St. Gallen, Solothurn, Schwyz, Waadt, Wallis and Zurich. We thank Arthur Sandri (Federal Office of the Environment) for access to the SilvaProtect-CH data.
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Handling Editor Manfred J. Lexer.
This article originates from the conference “Mountain Forest Management in a Changing World”, held 7–9 July 2015 in Smokovec, High Tatra Mountains, Slovakia.
Nomenclature: Lauber et al. (2012)
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Wohlgemuth, T., Schwitter, R., Bebi, P. et al. Post-windthrow management in protection forests of the Swiss Alps. Eur J Forest Res 136, 1029–1040 (2017). https://doi.org/10.1007/s10342-017-1031-x
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DOI: https://doi.org/10.1007/s10342-017-1031-x