Articles by N. A. Hildén
Category : Article
Private forests account for about 2/3 of the growth of the forests in Finland, but little is known about the economy of forestry in private farms. The study analyses the forestry in private farms using accounting data of farms, collected in a survey of profitability in agriculture that was compiled by the Board of Agriculture. The sample of 18 farms represent farms where the use of forests was sustainable. The accounting data was complemented by survey of forest recourses in the farms. The typical forest site type is Myrtillus type, and the average growing stock is 96‒136 m3/ha which is above the average of the private forests. Fellings exceeded the growth of the forests in some farms, but this was compensated by uncommonly large forest resources. In average, growth exceeded the fellings. Timber accounted for most of the sales, while fuel wood sales exceeded the pulpwood sales. The significance of thinning seems not be fully understood in the farms. Especially standing sales of timber was important for the economy of the farms.
The PDF includes a summary in German.
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Hildén,
E-mail:
nh@mm.unknown
The aim of the study was to determine the value of common alder (Alnus glutinosa (L.) Gaertn.) in forestry by studying an unusually large alder forest in Kontusaari, an island of the size of 75 hectares in the Southern Finland. The forest is grass-herb forest site type. The coastline of the island is partly flooded. Wood has been harvested mainly for fuel wood. The stands have regenerated easily from stump shoots. The annual volume growth is slightly higher than what would be in Norway spruce (Picae abies (L.) Karst.) or Betula sp. stands, estimated based on growth and yield tables made by Ilvessalo. The site is well suited for common alder, and it is difficult to judge what the yield would be for other species on the site.
The volume 34 of Acta Forestalia Fennica is a jubileum publication of professor Aimo Kaarlo Cajander. The PDF includes a summary in German.
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Hildén,
E-mail:
nh@mm.unknown
Sample trees of Betula sp. were felled in North Karelia in different forest site types. The stands, both mixed and pure stands, had been regenerated in areas where shifting cultivation had been practiced. Sample trees represented breast height diameters up to 43 cm. Diameter was measured in distances of 1/10 of the height of the tree to calculate the stem form. The form factor was higher for the good forest site types than the poor sites. The volume tables were calculated based on the assumption that diameter does not affect the form factor. Comparing the volume table to the original data, it was found that the table seems to form a successful fitting of the data. Control data proved that the method seems to give a good fitting to the used data. Thus, the volume table can be used to measure volume of birch stands in North Karelia.
The PDF includes a summary in German.
-
Hildén,
E-mail:
nh@mm.unknown
