Browsing by Subject "hirvituhot"

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  • Heikkilä, Risto; Mikkonen, Timo (The Society of Forestry in Finland - The Finnish Forest Research Institute, 1992)
  • Heikkilä, Risto; Löyttyniemi, Kari (Suomen metsätieteellinen seura, 1992)
  • Pulliainen, Erkki; Loisa, Kalevi; Pohjalainen, Tauno (Suomen metsätieteellinen seura, 1968)
  • Suomen metsätieteellinen seura; The Finnish Society of Forest Science; Finlands Forstvetenskapliga Samfund (Suomen metsätieteellinen seura, 1960)
  • Lääperi, Ari (The Society of Forestry in Finland - The Finnish Forest Research Institute, 1990)
    Moose (Alces alces) cause considerable damage to traffic, agriculture and forestry in Finland. This has resulted in pressure to reduce the moose stock. The proposal that moose damage might be reduced by providing alternative sites was investigated. In spring 1987, six feeding sites and six 1-ha control areas were selected in Scots pine (Pinus sylvestris) plantations in the Ruokolahti-Imatra area, Finland. Mineral licks and aspen (Populus tremula) and Scots pine tops were provided on the feeding sites. These sites were also treated with nitrogen fertilizer. Before 1987, moose had destroyed four plantations in the immediate surroundings of the experimental areas. During the period 1987-89 only one plantation was destroyed. This was attributed to the setting up of the feeding sites. It was also noted that the reduction in damage was partly due to a probable decrease in the moose population. The number of damaged plants near one of the feeding sites was significantly greater than the damage near its corresponding control area, because there was not enough food for the moose population at this feeding site. It is concluded that the establishment of winter feeding sites may be a practical method for reducing moose damage and keeping the moose stock at its present size. The main problem was the increased risk of damage near feeding sites if the food is not replaced quickly enough.
  • Laine, Jukka; Mannerkoski, Hannu (Suomen metsätieteellinen seura, 1980)
  • Löyttyniemi, Kari; Hiltunen, Raimo (Suomen metsätieteellinen seura, 1978)
  • Heikkilä, Risto (The Society of Forestry in Finland - The Finnish Forest Research Institute, 1991)
    Studies were made at Lapinjarvi, S. Finland, in May and September 1987 and May 1988 on the utilization of available food resources by moose (Alces alces) in a Scots pine (Pinus sylvestris) plantation containing an admixture of deciduous species. Rowan (Sorbus aucuparia) and aspen (Populus tremula) were preferred-food compared to pine and both silver birch (Betula pendula) and pubescent birch (B. pubescens). However, rowan and aspen were not capable of withstanding continuous browsing by moose owing to their diminished biomass. The browsing intensity (number of browsed twigs/tree) on pine and birch was about twice that on rowan and aspen. The number of browsed twigs per tree increased as the amount of available main branches increased. The number of bites per available branch, as well as the maximum diameter of the bites, decreased as the density of the plantation increased. Silver birch was preferred to pubescent birch; planted silver birch was preferred to naturally regenerated trees. Main stem breakage was especially common in winter 1988; the average height of pine and birch was >2 m. The tops of broken stems were commonly utilized as food. The increase in moose density and the relatively deep snow cover promoted the incidence of serious damage. The number of undamaged trees/ha was greater in dense than in sparse parts of the stand.
  • Yli-Vakkuri, Paavo (Suomen metsätieteellinen seura, 1955)
  • Löyttyniemi, Kari (Suomen metsätieteellinen seura, 1985)
  • Löyttyniemi, Kari; Heikkilä, Risto; Repo, Seppo (Suomen metsätieteellinen seura, 1992)
  • Silvennoinen, Raimo; Nygrén, Kaarlo; Weissenberg, Kim von; Hämäläinen, Rauno (Suomen metsätieteellinen seura, 1991)