Pentti Alho. (1968). Pohjois-Pohjanmaan metsien käytön kehitys ja sen vaikutus metsien tilaan. Acta Forestalia Fennica no. 89 article id 7189. https://doi.org/10.14214/aff.7189

English title: Utilization of forests in north Ostrobothnia and its effect on their condition.

Original keywords: hakkuut; kaskiviljely; hakkuutavat; tervanpoltto; metsien käyttö; metsävarat; sahateollisuus; Pohjois-Pohjanmaa; poimintahakkuut

English keywords: Finland; forest utilization; selective cutting; logging methods; forest resources; Ostrobothnia

Abstract | View details | Full text in PDF | Author Info

The purpose of the present investigation was to study the extent of human interference with the forests of different epochs in the district of north Ostrobothnia in Northern Finland, and its effect on the condition of the forests.

The study revealed that the quantities of wood removed were not most detrimental to the condition of the forest; the regionally irregular loggings and the logging methods employed were the most harmful. The old forms of wood utilization, tar industry, shipbuilding, sawmill industry and timber exports, were characterized by timber selection. Public opinion considered it the only recognized cutting method long after the conditions had changed and silvicultural methods should have been used.

The spread and abandonment of selection cuttings are illustrated in the results of first National Forest Surveys in Finland. According to the first survey (1921–1924), nearly half of the loggings in the province of Oulu were based on selection, which spoiled and devastated 41% of the forests. In the 1930s one-fifth of the North Ostrobothnian forests were weakened by selection cuttings, in 1960s the figure was 6%. The article also summarises the extent of tar and pitch production, sawmill industry, shipbuilding and household wood consumption of wood in the area.

The PDF includes a summary in English

Alho, E-mail: pa@mm.unknown

Category : Research article

article id 406, category Research article

Bernt-Håvard Øyen, Petter Nilsen. (2004). Growth and recruitment after mountain forest selective cutting in irregular spruce forest. A case study in Northern Norway. Silva Fennica vol. 38 no. 4 article id 406. https://doi.org/10.14214/sf.406

Keywords: Norway spruce; mountain forests; selective cutting; North-Norway

Abstract | View details | Full text in PDF | Author Info

During the last thirty years the interest for the use of selective cutting in the sub-alpine spruce forests of Norway has increased. However, there have been very few investigations on the post harvesting development after such cuttings. Four plots in irregular Norway spruce (Picea abies (L.) Karsten) dominated forests on semi-fertile sites in Northern Norway have been the subjects of a case study. We performed a reconstruction of the stand development by means of biometric assessments and ring widths measurements of all standing trees. Tree ages, stand structure, growth and recruitment were examined. Even though a hypothetical reverse J-curve for the present diameter distribution was identified, the four plots were even-aged. Growth reactions indicate that most of the present sawtimber trees were established after heavy dimension cuttings in the late 19th century. The recruitment situation is characterized as satisfying in one of four plots. The post harvesting mean volume increment on the plots have been about two thirds of the potential yield estimated from site indices and maximum mean annual increment in regular stands. Managing strategies for irregular spruce forest stands are briefly discussed.

Øyen, Norwegian Forest Research Institute-Bergen, Fanaflaten 4, N-5244 Fana, Bergen, Norway E-mail: bernt-havard.oyen@skogforsk.no
Nilsen, Norwegian Forest Research Institute-Bergen, Fanaflaten 4, N-5244 Fana, Bergen, Norway E-mail: pn@nn.no

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