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Natural Forest Dynamics in Boreal Fennoscandia: a Review and Classification

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Natural Forest Dynamics in Boreal Fennoscandia: a Review and Classification Silva Fennica 45(5) review articles SILVA FENNICA www.metla.fi/silvafennica · ISSN 0037-5330 The Finnish Society of Forest Science · The Finnish Forest Research Institute Natural Forest Dynamics in Boreal Fennoscandia: a Review and Classification Timo Kuuluvainen and Tuomas Aakala Kuuluvainen, T. & Aakala, T. 2011. Natural forest dynamics in boreal Fennoscandia: a review and classification. Silva Fennica 45(5): 823–841. The aim here was to review and summarize the findings of scientific studies concerning the types of forest dynamics which occur in natural forests (i.e. forests with negligible human impact) of boreal Fennoscandia. We conducted a systematic search for relevant studies from selected reference databases, using search terms describing the location, structure and proc- esses, and degree of naturalness of the forest. The studies resulting from these searches were supplemented with other known works that were not indexed in the databases. This procedure yielded a total of 43 studies. The studies were grouped into four types of forest dynamics according to the information presented on the characteristics of the native disturbance- succession cycle: 1) even-aged stand dynamics driven by stand-replacing disturbances, 2) cohort dynamics driven by partial disturbances, 3) patch dynamics driven by tree mortality at intermediate scales (> 200 m2) and 4) gap dynamics driven by tree mortality at fine scales (< 200 m2). All four dynamic types were reported from both spruce and pine dominated forests, but their commonness differed. Gap dynamics was most commonly reported in spruce forests, and cohort dynamics in pine forests. The studies reviewed provide the best obtainable overall picture of scientific findings concerning the characteristics and variability of the unmanaged boreal forest dynamics in Fennoscandia. The results demonstrate that the unmanaged Fennoscandian forests are characterized by more diverse and complex dynamics than has traditionally been acknowledged. Keywords disturbance, age structure, stand replacement, cohort, gap, patch, natural disturbance emulation Addresses University of Helsinki, Department of Forest Sciences, P.O. Box 27, FI-00014 University of Helsinki, Finland E-mail [email protected] Received 2 November 2010 Revised 7 November 2011 Accepted 16 November 2011 Available at http://www.metla.fi/silvafennica/full/sf45/sf455823.pdf 823 Silva Fennica 45(5), 2011 review articles 1 Introduction Most of the remaining natural and old-growth forests of boreal Fennoscandia are located at Knowledge of the natural structure and dynamics northern, high-altitude and low-productivity sites of forests is important, both for basic understand- (Aksenov et al. 1999). Fortunately, some large ing of ecosystem functioning as well as for prac- pristine forested landscapes still exist where tical reasons. Forest habitats shaped by natural research on a variety of spatial scales is pos- forest development are those that the native spe- sible. Some of the most notable remaining land- cies have adapted to during their evolutionary his- scapes are located in Russian territory of eastern tory. Knowledge of the characteristics of natural Fennoscandia (Aksenov et al. 1999, Kuuluvainen forest habitats and their spatiotemporal dynamics 2002a), although not all of these areas are pro- at different scales is therefore indispensable for all tected, and thus face the threat of cuttings (Burnett efforts to sustain forest biodiversity (Angelstam et al. 2003). 1998, Bergeron et al. 2002). Activities using this In the southern Boreal Zone of Fennoscandia knowledge include restoration of ecologically only a low percentage of the forest cover can be impoverished managed forest ecosystems (Vanha- regarded as natural or near-natural, while consid- Majamaa et al. 2007) and the development of erably more remains in the middle and northern forest management strategies and silvicultural Boreal Zones. Often the few southern conserva- prescriptions that seek to emulate natural forest tion areas are so small that the full range of forest dynamics (Angelstam 1998, Bergeron et al. 2002, dynamic processes cannot be expected to occur Kuuluvainen 2009). For example, the debate on (Lilja and Kuuluvainen 2005). This consequently what constitutes ‘nature-based’ forestry (e.g. severely limits the opportunities to obtain rep- Diaci 2006, Larsen and Nielsen 2007) requires resentative regional understanding of the ecol- robust information on the structure and dynamics ogy of potential natural forests. For this reason, of the natural forest. Finally, it can be argued that sustained efforts should be made to combine a better understanding of the ecology of natural different methodologies and information sources forests is needed in order to devise ways to miti- to obtain a better understanding of the ecology of gate and adapt to future climate change (Keane natural forests. Although some effort has already et al. 2009). been made to synthesize information on natural Currently in boreal Fennoscandia, the oppor- forest dynamics in Fennoscandia (Kuuluvainen tunities for studying natural forest ecosystems 1994, 2002b, Esseen et al. 1997, Engelmark 1999, have become severely limited. The historical Engelmark and Hytteborn 1999), no systematic roots of the disappearance of natural forest lie in review of the existing scientific literature has hundreds of years of diverse and intense forest hitherto been carried out. exploitation. As a result of increasing population The aim here was therefore to conduct a sys- pressure during recent centuries, the most pro- tematic review (cf. Pullin and Stewart 2006, Pullin ductive southern forest types were the first to be et al. 2009) of existing studies dealing with distur- converted to permanent agricultural land. Other bance and successional dynamics of unmanaged wide spread uses of the forest included slash-and- forests in boreal Fennoscandia and to classify the burn cultivation, tar production, forest pasturage, forest dynamics reported according to predefined ship building and iron mining. The onset of forest categories. Although the studies reviewed do not industry in the 19th century further accelerated represent an unbiased or a representative sample the disappearance of primeval forest cover. How- of the prevalence of different forest dynamics ever, due to logistic restrictions, more remote types, they nevertheless can provide a large-scale areas remained unaffected until fairly recently. picture of what has been reported on the charac- For example, as late as the mid-19th century a teristics and variability of natural forest dynamics large part of the inland in southern and all of in Fennoscandia. northern Finland was covered by natural or near- natural forests; this estimate was based on the first national-level assessment of forest resources by C.W. Gyldén of 1850 (Lindholm 2004). 824 Kuuluvainen and Aakala Natural Forest Dynamics in Boreal Fennoscandia: a Review and Classification 2 Material and Methods 2.1 Geographic Scope of the Review 70 1 1, 5 The study focused on boreal forests in the Fen- 11 7 6 noscandian Shield (henceforth Fennoscandia). 12 23, 40 8, 13 35 Geographically, the area encompasses Norway, 5 6 26 14, 19, 20, 32 9, 3 28 Finland, most of Sweden, as well as the Mur- , ºN 27 41 36 39 39 mansk province and Republic of Karelia in 16 30 17, 31 Russia. Part of the Leningrad province in Russia Latitude 18 24 also lies within Fennoscandia (see Fig. 1). The 37 29 0 area of the Fennoscandian boreal forest stretches 6 33, 22 from 58°N in southern Norway and Sweden, to 4 69°N in northern Norway. Longitudinally, the area is demarcated by the Atlantic Ocean at the Norwegian coast at app. 5°E and the White Sea 5 off the Kola Peninsula at 41°E. 5 Most of the bedrock in Fennoscandia is made 5 10 15 20 25 30 35 40 Longitude, ºE up of Precambrian granites and gneisses, cov- Fig. 1. Fennoscandia, with its eastern and southern ered by young Quaternary and Holocene sedi- limit, and the geographical distribution of sites of ments, consisting mainly of podzolized moraines the studies reviewed. The numbers refer to the list (Lidmar-Bergström and Näslund 2005). The area of studies reviewed in Appendix 1. The studies at exhibits a varied topography. In the west the regional scales are not included. These include Uut- Scandes reach heights between 1000 and 2500 tera et al. (1997) from the Ladenso forest inventory m above sea level (a.s.l.). A ridge at an elevation area in Russian Karelia, Sirén (1955), Aaltonen exceeding 200 m a.s.l. extends from the Scandes 1919 and Lassila (1920) in northern Finland, and mountain range through northern Finland and the Zackrisson (1977) in midnorthern Sweden. The Kola Peninsula, along which the summits of the following Russian studies also lack information on gently rolling hills (fells) rarely reach elevations the exact location: Kazimirov (1971), Zyabchenko above 1000 m. Finland and the southern part of (1984) and Volkov (2003). Sweden are mainly lowland, whereas Norway only has a narrow strip of lowland lying along the coastline. The main factor influencing the climate in Fen- 2000 mm on the Norwegian coast to 450–500 noscandia is its position between the Atlantic mm in the interior of northern Lapland (Tikkanen Ocean and Eurasia. The Scandes Mountains in the 2005). In southwestern Norway 11% and in north- west give rise to major differences in precipitation ern Sweden 38% of the precipitation comes as particularly between the western and eastern parts snow (FAO 2005). of the region. The Norwegian coast is highly mar- The main forest-forming tree species in the itime, while the eastern parts of Fennoscandia are region include Scots pine Pinus sylvestris L., intermediate between maritime and continental. Norway spruce Picea abies (L.) Karst., birches However, in all parts of the area at least moderate Betula spp., and aspen Populus tremula (L.). Of precipitation is recorded throughout the year. In these, Pinus sylvestris, Betula spp., and Populus the area covered by boreal forest, the mean tem- tremula are considered shade-intolerant pioneer perature of the warmest month (July) ranges from species.
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