Current issue: 55(3)
Under compilation: 55(4)
A study on wild berry-bearing plants was made in five municipalities in Central Finland during 1978–81. Yield of lingonberry (Vaccinium vitis-idaea L.) was 8.0 kg/ha of forest area. Bilberry (Vaccinium myrtillus L.) produced 4.3 kg/ha and black crowberry (Empetrum nigrum coll. L.) 1.5 kg/ha. Lingonberry comprised 40%, bilberry 27% and black crowberry 14% of the total berry yield. Any other species produced less than 10% of the total yield. Lingonberry produced high yield in clear-cut areas and in old Scots pine dominated forests but bilberry production was restricted almost completely to old sparse forests.
The total lingonberry yield in Finland was estimated as 180 million kg and the total bilberry yield as 150–200 million kg. About 80% of the lingonberry yield and 60% of bilberry yield was judged to be gatherable on the basis of the yield.
The PDF includes a summary in English.
Fertilizer factory has been found to be harmful to the surrounding area through its fertilizing effect, mainly due to nitrogen compounds in the form of NOx and ammonium. In this study, pH, K, Ca and Mg contents in the humus layer were monthly monitored around a fertilizer industry in Oulu, Northern Finland, in 1975 and 1976. In addition, nutrient analyses were made in the leaves of Vaccinium vitis-idaea, V. myrtillus and Empetrum Nigrum.
The calcium, magnesium and potassium present in the emission of airborne fertilizer dust brought about an increase of the nutrient content of the surface top soil humus compared with the control samples. The nutrient contents of dwarf shrub leaves increased near the industrial site as compared with the controls. The potassium contents of Vaccinium myrtillus and Empetrum nigrum were exceptionally high. The results of this pilot study show that the overfertilization must have had an increasing effect on the nutrient status changes in the forest environment.
Several studies of air polluted forest environments have shown that dwarf shrubs suffer from air pollution. In many cases the disturbances have been attributed to the susceptibility of the dwarf shrubs, while in some cases the vegetational competition factor has been discussed. The growth pattern of dwarf shrubs is very complicated and a single individual can cover large areas due to vegetative reproduction. Since dwarf shrub individuals cannot be transplanted for the purpose of laboratory or field tests, the only possibility is to use small cuttings for the bioindication studies. Some preliminary results are discussed.