Browsing by Subject "avohakkuut"

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  • Rajakallio, Maria; Jyväsjärvi, Jussi; Muotka, Timo; Aroviita, Jukka (Blackwell, 2021)
    Journal of Applied Ecology 58: 7, 1523-1532
    1. Growing bioeconomy is increasing the pressure to clear-cut drained peatland forests. Yet, the cumulative effects of peatland drainage and clear-cutting on the biodiversity of recipient freshwater ecosystems are largely unknown. 2. We studied the isolated and combined effects of peatland drainage and clear-cutting on stream macroinvertebrate communities. We further explored whether the impact of these forestry-driven catchment alterations to benthic invertebrates is related to stream size. We quantified the impact on invertebrate biodiversity by comparing communities in forestry-impacted streams to expected communities modelled with a multi-taxon niche model. 3. The impact of clear-cutting of drained peatland forests exceeded the sum of the independent effects of drainage and clear-cutting, indicating a synergistic interaction between the two disturbances in small streams. Peatland drainage reduced benthic biodiversity in both small and large streams, whereas clear-cutting did the same only in small streams. Small headwater streams were more sensitive to forestry impacts than the larger downstream sites. 4. We found 11 taxa (out of 25 modelled) to respond to forestry disturbances. These taxa were mainly different from those previously reported as sensitive to forestry-driven alterations, indicating the context dependence of taxonomic responses to forestry. In contrast, most of the functional traits previously identified as responsive to agricultural sedimentation also responded to forestry pressures. In particular, taxa that live temporarily in hyporheic habitats, move by crawling, disperse actively in water, live longer than 1 year, use eggs as resistance form and obtain their food by scraping became less abundant than expected, particularly in streams impacted by both drainage and clear-cutting. 5. Synthesis and applications. Drained peatland forests in boreal areas are reaching maturity and will soon be harvested. Clear-cutting of these forests incurs multiple environmental hazards but previous studies have focused on terrestrial ecosystems. Our results show that the combined impacts of peatland drainage and clear-cutting may extend across ecosystem boundaries and cause significant biodiversity loss in recipient freshwater ecosystems. This information supports a paradigm shift in boreal forest management, whereby continuous-cover forestry based on partial harvest may provide the most sustainable approach to peatland forestry.
  • Kubin, Eero; Kemppainen, Lauri (The Society of Forestry in Finland - The Finnish Forest Research Institute, 1991)
    Air and soil temperatures were measured in 1974-85 in 3 clear felled areas and 3 neighbouring forest stands dominated by Norway spruce (Picea abies) in N. Finland. Daily temperatures were measured with thermograph plotters and maximum and minimum thermometers in meteorological screens (2 m above the ground), and a Grant device at 10 cm above the ground and at 5, 50 and 100 cm below ground level. Clear felling had no significant influence on air temperature at 2 m above the ground. The daily air temperature maxima at 10 cm were greater in the clear fell area than in the forest; the daily temperature minima at 10 cm were less in the clear fell area. Night frosts were more common in the clear fell area. Daily soil temperatures at 5 cm depth were 2-3 degrees C greater in the clear fell area than in the forest; temperatures at 50 cm and 100 cm depth were 3-5 degrees C greater. A sparse sapling stand developed from plantings and natural regeneration. Consequently, the differences between the clear fell area and the forest did not diminish during the 12 years following clear felling.
  • Hytönen, Outi (Helsingfors universitet, 2013)
    This thesis deals with public opinion of the decision making concerning forest policy in Finland. The data used was part of a nationwide mail survey examining the perceptions of the legitimacy of forest policy and its predictors in Finland. The data comprised of the answers to the question “What would you like to focus on in the decision making concerning forest use?”. The answers were analysed using inductive content analysis. The topics from the data were categorised under four themes: values, political decision-making, actors and practises. Based on the answers forests are regarded as multifunctional and the different value conceptions are equally respected. However, the existing value conflict between economic and ecological values was evident. The forest policy cannot be legitimised only on the basis of economic use of the forest resources. The biodiversity, nature protection and the recreational benefits of the forests must also be taken into account according the citizens. The results were analysed in the light of the goals and procedures set in the main documents of the Finnish forest policy. The aim was to compare the similarities and differences between current forest policy and citizens’ perspectives, and to find out if one can make any judgements about the acceptability and legitimacy of the forest policy. In general, citizens know what is included in forest policy decisionmaking, and the opinions are consistent with current policy. Certain forestry actions and forest owners’ decision-making power are the main points of conflict. Clear cuttings and especially the objection of them was the most essential topic in the data. This is against the prevailing forestry practises, since clear cuttings are the most used method in final felling. Citizens suggest alternative forestry practises like thinning and uneven-age management to be used in the felling of timber. According to the results concerning political decision making the main conflict arises from forest owners’ participation possibilities and the distribution of power. The procedural justice of the forest policy is not fully justified and legitimate, since citizens feel forest owners have too little decision-making power on their own forest property.