Silva Fennica vol. 11 no. 3 | 1977
Category : Article
The Nordic working group for forest fertilization is a group of research workers from the Nordic countries Denmark, Finland, Norway and Sweden, which has been working on plant nutrition questions and forest amelioration problems. The group has met annually to discuss current problems, hitherto mostly concerning forest fertilization. In 1976 the question of future working forms came up, and the group decided to arrange a symposium on the subject Nutrient cycle in tree stands in 1977.
This symposium took place in Harjavalta and Ikalis in Finland from the 29th of August to 1st of September 1977. During the symposium 12 papers were presented, which are published in the following, either in full or as summaries of a given lecture. Part of the lectures are in English and part in Swedish.
The paper includes the following titles:
A bioelement budget of an old Scots pine forest in Central Sweden
Mobilization of plant nutrients in a Scots pine forest Mor in Central Sweden
Accumulation of organic matter and nitrogen on sand dunes following sand fixation and planting of dwarf mountain pine
Sambandet mellan torvmarkstyp och yttorvens näringshalt
Changes in the amounts of inorganic nutrients in the soil after clear-felling
Plant nutrient balance in decoration greenery cultivation
The effect of forest fertilization on primary production and nutrient cycling in the forest ecosystem
Förändringar i humuslagret efter skogsgödling
Balanserad näringsupptagning och behovet av gödsling i trädbestånd på näringsfattiga torvmarker
Of fertilization on nutrient contents in needles and litter fall of Scots pine on dwarf shrub pine swamp
Micro-nutrient deficiencies cause growth disturbances in trees
Tallarnas växtstörningar, markens näringsbalans och micronäringsbrist
The paper describes the use of printed area in some scientific series concerned with forestry. The material consisted of 8 scientific series, the total number of analysed pages being 2,942. According to the results, the use of printed area was more efficient in journals and other similar periodicals which included several scientific papers than in series published as separate issues. The main reason was the more efficient editorial make-up. The Finnish papers included less figures but more tables than foreign series. There were marked differences between series irrespective of the country of origin. The average figure area varied from 60 to 180 cm2 between series, for example. According to the observations there are good possibilities for making more efficient use of the printed area available.
The PDF includes a summary in English.
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Kärkkäinen,
E-mail:
mk@mm.unknown
The study is part of a project designed to elucidate the nutrient budget of a Scots pine (Pinus sylvestris L.) stand. Results of variation in the nutrient contents were compared with those obtained for the previous growing season.
The potassium and calcium contents varied the greatest in the humus layer. However, in the bottom and field layer vegetation and needles the variation in the nitrogen content was the greatest. The nutrient contents of the needles were affected by the physiological stage of development, needle age and the position in the crown of the tree. The nutrient content of the rainfall increased in the order: free rainfall, throughfall, and stem flow.
The PDF includes a summary in Finnish.
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Lehtonen,
E-mail:
il@mm.unknown
The amounts of harvestable logging residues and stump and root wood were examined in the area where 100,000 solid m3 of stemwood was cut in 1975. The cutting amounts of stemwood from work sites suitable for harvesting of logging residues was 35,000 m3, and suitable for harvesting of stump and root wood 38,000 m3. The increase in the yield of wood (without bark) from logging residues compared with the unbarked stemwood was 2.4%. The same percentage of wood from stump and root wood was 5.0–5.8% depending on the harvesting loss.
The PDF includes a summary in Finnish.
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Mäkelä,
E-mail:
mm@mm.unknown
The object of the study was to give a tentative indication of the realized economic significance of the principal forest (forestry land) uses in Finnish Lapland. Data concerns the years of the 1970s. Nowadays timber harvesting generates a major part of the total value of production. Recreation (tourism) is in second place. Reindeer husbandry, collection of berries and mushrooms and hunting together produce, in the best years, an output value which is about one fifth of that of timber harvesting. Non-timber uses together produce a rather significant portion on the total value of the integrated forestry output.
The PDF includes a summary in Finnish.
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Saastamoinen,
E-mail:
os@mm.unknown
The aim of the present study was to investigate the trampling tolerance of forest ground cover of the Calluna, Vaccinium and Myrtillus type sites. Positive correlation was found between the site fertility and trampling tolerance of plant communities. Annual trampling at level of about 16,000 visits per hectare decreased the biomass of the ground cover to almost half of the original amount, and annual trampling of about 160,000 visits per hectare completely destroyed the forest ground cover irrespective of site fertility. Comparisons made between herb and grass dominated forest ground cover showed that herb and grass cover is in the long run the best alternative for the management of ground cover in intensively used recreation areas.
The PDF includes a summary in Finnish.
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Kellomäki,
E-mail:
sk@mm.unknown