Current issue: 58(5)
Articles containing the keyword 'northern Finland'
Category : Article
The profitability of jointly owned forest holdings in the two northernmost forest board districts of Finland was studied by means of ratio analysis. A time series of profit and loss statements and balance sheets from 33 holdings covering the fiscal years ending 1981–1990 served as the database. The studied area was 348,038 ha, the allowable cut 304,300 m3 per year and the average turnover, deflated by the wholesale price index, FIM 57.6 million per year. The key result obtained was that the average annual profit was FIM 107 per hectare and FIM 110 per m3. The time series showed that the ratios had increased significantly over the calculation period.
The PDF includes an abstract in Finnish.
-
Penttinen,
E-mail:
mp@mm.unknown
- Kinnunen, E-mail: mk@mm.unknown
The results of regenerating 54 and 36–38-year old strip cuttings were surveyed in the Kivalo Research Forest (N 66°20’, E 26°40’). 15 measurement plots were placed on each strip. The most common forest type was Hylocomnium-Myrtillus type. Regeneration of the strips proved to be slow. Most of the spruces growing on the strips probably originated from the time before the cutting. The average number of stems was 1,155 per ha, of which one third consisted of broadleaved trees. The average volume increment of stem wood after cutting had been about 1 m3/ha/yr, but it was increasing at the time of the inventory. Both the reforestation of the strips and the development of the emergent stands were dependent on elevation and site fertility. Site fertility was indicated by the abundance of Vaccinium myrtillus.
The PDF includes an abstract in English.
-
Pohtila,
E-mail:
ep@mm.unknown
The winter 1986–87 was unusually cold; the snow cover remained thin and consequently the soil froze to a considerable depth. In spite of the severe frost, the lowest temperatures measured at the ground surface was -10.3°C and in the soil at the depth of 10 cm -5.8°C. The temperature sum of the following summer was unusually small and the soil frost melted more slowly than usual. The winter frosts did not have a decisive influence on the survival of planted seedlings.
The PDF includes an abstract in English.
-
Kubin,
E-mail:
ek@mm.unknown
In Northern Finland as well as in Northern Sweden there is a shortage of high-quality Scots pine (Pinus sylvestris L.) seeds, mostly due to unsuitable temperatures during the development and maturation of cones and seeds. Methods have been developed for elimination of non-productive seeds and for invigoration of seeds. In the present work, these methods were tested on poorly developed seed lot from Rovaniemi, Northern Finland (66°15’–66°30’; 180 m a.s.l.). The seeds were conditioned using the following treatments:
1. PREVAC method (5 min, 97 kPa below atmospheric pressures) for removal of mechanically damaged seeds (7%)
2. Invigoration using incubation at controlled moisture content (30% f.w) and continuous air supply, for 14 days at 5°C.
3. Additional water supply for 16 hours at 5°C.
4. Drying in dehumidified air until a near maximum difference in density between viable and dead seeds was obtained
5. Separation in a sedimentation flume to achieve a gradient of fractions of different germination rate and capacity.
The treatments resulted in an improvement of germination percentage from 33 to about 95% and a reduction in mean germination time from 8.8 days to 6 days if the control and the best fractions (32% seeds) were compared.
-
Bergsten,
E-mail:
ub@mm.unknown
A survey was carried out among forest foremen and forest technicians to record their observations on the value of various swamp and forest types as producers of berries and on the effect of drainage of peatlands upon the berry yields. Comparative agreement existed on the best blueberry (Vaccinium myrtillus L.) forest types and on the best lingonberry (Vaccinium vitis-idaea L.) forest types of rather dry upland sites. Fuscum pine swamps or fuscum bogs were considered best for the most part as regards the yield of cloudberry (Rubus chamaemorus L.). The replies showed rather great dispersion.
Agreement existed as well on the relation between drainage of peatlands and the yields of our economically most important swamp berries, cloudberry and cranberry. 90% of those responding were of the opinion that drainage reduces the cloudberry yield in the long term and a full 97% indicated that cranberry crop diminishes as well.
The PDF includes a summary in English.
-
Sepponen,
E-mail:
ps@mm.unknown
Basic density and absorbed energy in impact bending were measured for 500 Norway spruce (Picea abies (L.) H. Karst.) samples from Northern and Southern Finland. Statistical analysis showed that the relationship between impact strength and basic density was significant and regression analysis showed that it was linear.
Furthermore, with constant density, the impact strength was higher in Northern than in Southern Finland. This was due to growth ring width: i.e. when density was kept constant the impact strength increased with decreasing growth ring width. In addition, when the growth ring width was kept constant, the basic density of wood was higher in Southern Finland than in Northern Finland.
The PDF includes a summary in English.
-
Saranpää,
E-mail:
ps@mm.unknown
A population consisting of 450 Norway spruce (Picea abies (L.) H. Karst.) samples was gathered from northern and southern Finnish wood. The static bending strength was affected greatly by the density of the wood. However, keeping the density constant, the bending strength was higher in northern than in southern Finnish wood. The reason was the effect of the growth ring width.
The basic density was affected by the growth rate. Keeping the growth ring width constant, the basic density was over 5 kg/m3 lower in northern than in southern Finnish wood. This result supports the earlier findings on the effect of latitude.
The PDF includes a summary in English.
-
Kärkkäinen,
E-mail:
mk@mm.unknown
- Dumell, E-mail: od@mm.unknown
The present study deals with the effect of forest drainage on some quality factors of brook waters. Under study were several brooks in the basin of the Kiiminkijoki River as well as its main tributary, the Nuorittajoki River. These are located in Northern Finland and belong to the international water program Project Aqua.
The following values were determined for the water samples: pH, electric conductivity, colour, concentration of suspended solids., NO2, NO3, and NH4 nitrogen concentrations, dissolved and total phosphorus, and Ca, Mg, K and Fe concentrations. Water quality in the brooks was monitored prior to and after ditching. A statistically significant change was noted in colour, in the concentration of suspended solids, in the NH4 concentration and in some brooks also in the pH value and in the total phosphorus, K, and Fe concentrations.
The PDF includes a summary in English.
-
Hynninen,
E-mail:
ph@mm.unknown
- Sepponen, E-mail: ps@mm.unknown
The study is the first report of a larger project concerning fire ecology in the Finnish boreal forests. Modern forestry has never been practiced in the Ulvinsalo strict nature reserve (2,500 ha) in Northern Finland in the county of Kuhmo. Forest fires have been uncommon because of mosaic of mineral and peat soils. The forests are mostly Norway spruce (Picea abies (L.) H. Karst.) dominated with Scots pine (Pinus sylvestris L.) often as the oldest trees of a stand. Forest fires were dated by counting annual rings from cambium to the fire scar in pines. 73 stands covering 1,207 ha were surveyed, over 80% of which was on mineral soil.
50% of the area had burned at least once during the life time of the present pine trees. 48 different forest fires were found, the first being from the year 1712 and the latest from 1969. The average time elapsed between the fires was about 82±43 years, and range 18–219 years. It was assumed that the stands where no fire scars were found, had, however, regenerated after fires but no fires have occurred since after that. In latter part of the 19th century 21 forest fires were dated, in the other half centuries only 4–9. This may have been caused by the increased human activity in the late 1800’s. The fire rotation of the area is 280 years, and spruce is almost the only tree species, which can regenerate in the present situation.
The PDF includes a summary in English.
-
Haapanen,
E-mail:
ah@mm.unknown
- Siitonen, E-mail: ps@mm.unknown
The success of certain Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) H. Karst.) provenances from Northern Finland was studied in a tree damage area occasioned by air pollution in the town of Oulu over the period of 1972-76. The pine strains from more northerly and easterly areas and the spruce strains from the immediate vicinity of the site itself were being observed to thrive best. The results point in a similar direction to those of other comparable experiments, except that the mortality rate amongst the saplings was exceptionally high and the proportion of healthy saplings in good condition was found to be unusually low. Structural properties suggestive of resistance to pollution were observable selectively in certain provenances, these including the xeromorphy of needles or thickness of the epidermis. The chief cause of mortality amongst the saplings was found to be the damage inflicted by pollution during the winter, while that arising in the summer months was relatively slight.
The PDF includes a summary in Finnish.
-
Huttunen,
E-mail:
sh@mm.unknown
The material of this study consists of 1,080 Scots pine (Pinus sylvestris L.) saw logs measures in two saw mills in Northern Finland. The largest and the smallest top-diameter of each log was measured under bark. According to the results, the ovalness was rather small, 1 mm or 4.9% on average. On the other hand, only 14.3% of all logs showed a diameter difference smaller than 2%. The ovalness was larger than 10% in 5.8% of all logs.
The PDF includes a summary in English.
-
Kärkkäinen,
E-mail:
mk@mm.unknown
Hydroelectric plants are being planned or already built in Northern Finland. The complete terracing and regulation of watercourses necessary for the power plants will mean great changes in floating conditions and hence for forestry, for which floating is the principal means of transport. Consequently, the Cabinet appointed a committee in 1958 to ascertain the economic, technical and legislative questions connected with timber transport in the area.
The committee has found that about half of the country’s forest area and two thirds of its water power resources are situated in Northern Finland. A prerequisite for the wise utilization of the forest in Northern Finland is an increase in fellings. This can only be put into effect by improving the means of transport, especially the floating channels. The financing required by the organization of floating connected with the building of the hydroelectric power plants amounts to about 10,000 million marks over a period of 20 years.
The committee has suggested that an advisory committee on floating should be established. Its most important task would be to try to produce a general programme for the organization of floating under the changed conditions, and that the State should participate in the expenditure caused by the organization as regards the capital investment needed for changing over to bundle floating.
The PDF includes a summary in English.
The aim of the study was to find out if it is possible to use Scots pine (Pinus sylvestris L.) seed from Central-Finnish origin in Northern Finland to supplement supply of local seeds. The principle has been to limit transfer of seeds to 200 km. According to this study, it seems possible to permit 300-400 km transfer of seeds at the same height above the sea level, not including the timber line area.
The author’s observations indicate that the trees originating from seeds of Central Finland at 20-35 years age withstand damage caused by snow and pine blister rust as well as the local provenience. However, the seedlings seem to be more susceptible to snow blight. Spraying of 2-3% sulphurated lime in the autumn before the arrival of snow proved to be most effective way to prevent the damage.
Southern proveniences have been found to grow faster than the local proveniences in Northern Finland. The stands of Tuomarniemi (Central Finland) and Rovaniemi (Northern Finland) provenances had no distinct difference in the summerwood percentage, and the volume weight of the Tuomarniemi provenience was higher than the weight of the provenience of Rovaniemi. The Tuomarniemi stand also gave largest yield, but the difference was probably due to partly at age difference of the sample trees. The naturally regenerated local provenance showed the greatest volume weight.
The article includes a summary in English.
-
Sirén,
E-mail:
gs@mm.unknown
Silva Fennica Issue 92 includes presentations held in 1956 in the 8th professional development courses, arranged for forest officers working in the Forest Service. The presentations focus on practical issues in forest management and administration, especially in regional level. The education was arranged by Forest Service.
The main part of arable land that could be cleared out into fields lies in Northern Finland, where climate conditions restricts agriculture. This presentation discusses conditions for profitable agriculture and settlement activities in the north.
-
Väisänen,
E-mail:
pv@mm.unknown
The wages of logging and haulage has been dependent on the decisions of foremen. The aim of this study was to provide better insight on how working conditions in a logging site affect productivity of the work. Six working sites operated by Forest Service, Veitsiluoto Oy and Kemi Oy in the communes of Salla, Muonio and Kolari in Lapland were studied. The forests in the area were mostly Scots pine (Pinus sylvestris L.).
The effect of average volume of the stems, the average daily haulage over distances of various lengths, density of the stand and shape of the stem on effectivity was calculated. The size of the team was of considerable importance to the felling and haulage result in the Northern Finland where the feller assists in loading of the logs. One of the aims of the study was to find out what size of team is most advantageous for each haulage distance. The results show the optimum distance of haulage for teams of different sizes.
The article includes a summary in English.
-
Maliniemi,
E-mail:
em@mm.unknown
The 4.4 km2 sized area of Rokua is a sandy ridge situated in the transitional zone between Central and Northern Finland. It has been suggested to become a new national park due to its, in the area unique landscape and geological characteristics.
The vegetation of the area has been little studied. A vegetation analysis was performed in 1945, 1947 and 1949. Due to low nutrients in the sandy soil, the number of species is relatively low, including 236 vascular plants. The climate is continental. Lichen covering of soil in the Scots pine (Pinus sylvestris L.) dominated forests is mostly intact compared to the more northern areas, because grazing of reindeer has been little. Fellings have increased in the surrounding areas of the planned national park. The article includes a detailed description of vegetation and flora in the area.
The article includes a summary in German.
-
Jalas,
E-mail:
jj@mm.unknown
The most common way to artificially regenerate cutting areas in Northern Finland has been sowing, which has, however, often given poor results. The aim of the study was to assess the success rate of sowing and study the causes of poor regeneration.
An inventory was made of 28 areas on Empetrum-Myrtillus and Hylocomnium-Myrtillus type sites sown with Scots pine (Pinus sylvestris L.) seeds in 1948-1950. In addition, to study the effect of substrata, a sowing experiment was established. According to the inventory, regeneration failed completely in 8 and partially in 6 of the 28 sown areas. Factors that explained the poor regeneration included unfavourable weather conditions in 1948-1952, insufficient clearing of sowing spot especially when the humus layer was thick, and insect damage by Otiorynchus dubius weevil.
The article includes a summary in English.
-
Sirén,
E-mail:
gs@mm.unknown
Silva Fennica Issue 69 includes presentations held in 1948-1950 in the fourth professional development courses, arranged for foresters working in the Forest Service. The presentations focus on practical issues in forest management and administration, especially in regional level. The education was arranged by Forest Service.
Lapland war in the end of the World War II left Northern Finland in destruction. This presentation describes in detail the work and expenditure of Forest Service in the reconstruction of the settelement in the area.
-
Aho,
E-mail:
aa@mm.unknown
Silva Fennica Issue 69 includes presentations held in 1948-1950 in the fourth professional development courses, arranged for foresters working in the Forest Service. The presentations focus on practical issues in forest management and administration, especially in regional level. The education was arranged by Forest Service.
Floating channels of Northern Finland have been unable to fulfill all the needs of wood transportation of the area. This presentation presents diferent ways to improve the efficiency of floating by improving working methods and the channels, and thus decreasing costs of wood transportation.
-
Kivelä,
E-mail:
ak@mm.unknown
Silva Fennica Issue 69 includes presentations held in 1948-1950 in the fourth professional development courses, arranged for foresters working in the Forest Service. The presentations focus on practical issues in forest management and administration, especially in regional level. The education was arranged by Forest Service.
This presentation discusses forest resources and felling potential of the state forests in different parts of the country, and how centralized fellings could be arranged. Most potential for increasing fellings is in Northern Finland.
-
Lihtonen,
E-mail:
vl@mm.unknown
A vegetation survey was conducted in the Pisavaara national park in Northern Finland in 1946 and 1947. The national park (49,9 km2) includes southern half of the Pisavaara hills. The rock is quartzite. The most common vegetation type is dry upland forest type, but also fresh mineral soil sites are typical for the area.
The most common forest type, Empetrum-Myrtillus type coveres almost as much of the area as all the other forest types combined. The article describes in detail the vegetation of all forest types and gives a complete list of all plant species found in the survey. Total of 291 vascular plants was found, 242 of which were native to the area. In addition, 49 anthropochores had spread to the area when the forest ranger’s cottage was built. Number of species growing in the northern edge of their natural range is. Southern species can be found in the southern slopes of the hill.
The article includes an abstract in German.
-
Teivainen,
E-mail:
lt@mm.unknown
Finnish tree species have adapted differently to heavy snow loads that occur especially in fell areas in Kuusamo and Salla as well as Maanselkä area in Sotkamo and Rautavaara in Northern Finland. Norway spruce (Picea abies Karst. L) is adapted better than Scots pine (Pinus sylvestris L.). The aim of this study was to investigate how crown and stem form of Norway spruce in the snow damage area of Maanselkä area differ from other areas in the same region.
Relatively broad crown at the base of the stem, quickly tapering crown and narrow and even upper crown were typical for trees growing in the snow damaged areas. The higher the altitude is, the stronger tapering the crown is. The tapering begins usually in a height of 4-5 meters. Even the stem diameter begins to taper strongly at this height. In the areas where heavy snow does not cause snow damage, top of crown is broader. Also, in the snow damage areas the damaged trees seem to have broader crown shape than the trees with little damages.
Height of the trees decreases in the snow damage areas compared to forests in lower altitudes, which can be caused both by wind and snow load.
The article includes a German summary.
-
Mikola,
E-mail:
pm@mm.unknown
The aim of the study was to follow development of vegetation in dry upland forest sites after forest fire. The sample sites were situated in the counties of Muonio, Kolari, Sodankylä, Pelkosenniemi, Savukoski, Kemijärvi and Salla, in the northernmost Finland.
The growth of plant communities can arise either from the vegetation and seeds that survived the fire, or from seeds that spread from the surrounding areas. The development of vegetation in the burned areas was unexpectedly independent of the surrounding areas, which indicates that role of the seeds from the outside of the burned ares is small. The occurence of different species of lichens, moss, scale moss and vascular plants in the burned areas are described in detail. The development of vegetation was strongly dependent on the forest site type. The thin humus layer of Cladina site type burns usually evenly, and also the vegetation develops more evenly than in the more fresh site types. Vegetation typical for burned areas was fully developed within 10-15 years, and after 25 years it began to resemble the vegetation of Cladina site type forests. The ground vegetation of Calluna type burned area was more patchy. It developed quicker than in Cladina type. Absense of lichens made it seem more fertile than is usual for Calluna type. The humus layer of Empetrum-Myrtillus site type burned unevenly, and if the area was lightly burned, the vegetation recovered quickly. The vegetation was often patchy.
The PDF includes a summary in German.
-
Sarvas,
E-mail:
rs@mm.unknown
Norway spruce (Picea abies (L.) H. Karst.) is rarely the dominant species on dry mineral soil sites in Northern Finland. These sites are, in general, too poor and dry for spruce, and suit better for Scots pine (Pinus sylvestris L.). According to the study, the natural regeneration of spruce is in Northern Finland poor. In the sample plots, cones could be found in 35% of spruce trees in the stands in natural state and 46% in the harvested stands. Compared to the spruce areas in Northern Finland, or fresh mineral soil sites in Southern Finland, cone and seed production of Norway spruce was in dry mineral soil sites very low due to scarcity of seed trees and their low cone number. There were few spruce seedlings in the sample plots, but according to the observations, spruce is able to regenerate on lichen and heath covered sites. The seedling growth was, however, poor on dry sites. Spruce seedlings were often found near fallen trees and stumps. The growing trees prevent growth of seedlings of all species. Norway spruce seems, however, to be able to spread also to the poor sites. The success depends on the vegetation and dryness of the site. For instance, spruce can spread to dry mineral soil sites from seed trees of nearby peatlands.
The PDF includes a summary in German.
-
Tikka,
E-mail:
pt@mm.unknown
The article gives a proposal for areas that would be suitable for protected areas, situated in state-owned lands in Northern Finland. Eight areas are described in the article, namely Oulankajoki area in Northern Kuusamo, Kutsajoki area in Kuolajärvi, Pyhätunturi in Kemijärvi, Pisavaara in Rovaniemi, Pallastunturi and Ounastunturi area, Malla fells in Kilpisjärvi, Pääskyspahta area in Petsamo and Heinäsaari in Petsamo.
Each of the areas possess special features in Finnish nature, samples of which should be reserved in pristine state. Furthermore, costs of the protection are small. The resident population is, however, in general against protection. The protection should therefore be organized in a way that minimizes the disadvantages caused by limitations to land use, for example grazing, reindeer husbandry, fishing and hunting.
According to Finnish Nature Conservation Act, all wildlife in the conservation areas should be protected. Protection of wolverine and wolf is, however, difficult because of the damages they cause for domestic animals. Protection of bear is regarded to be possible in most of the proposed protected areas.
-
Linkola,
E-mail:
kl@mm.unknown
Category : Article
Examination of stands developed under natural conditions can be used to provide basis for comparison for study of the development and yield of stands treated with intermediate fellings. In Finland, the first investigation and the yield and the structure of natural normal stands were published in 1920. This investigation on development and yield of the natural forests of Kainuu in southeastern Northern Finland is based on 92 sample plots on three forest types; Empetrum-Vaccinium type (EVT), Empetrum-Calluna type (ECT) and Vaccinium-Myrtillus type (VMT).
The Scots pine (Pinus sylvestris L.) sample plots represented variation of age classes for construction of mean development series. The Norway spruce (Picea abies (L.) H. Karst.) of the region are so old that development series could be obtained only for dominant trees based on stem analysis.
The average development of Scots pine stand on EMT type within the region is on average more rapid and the yield in cubic volume quantitatively larger and structurally better than that on ECT type. Self-thinning during the early decades of EVT is slower. The pine stands are denser in the age of 70 in Kainuu compared to Central Northern Finland, but the development and yield are similar.
The development, yield and structure of natural Norway spruce stand on VMT proved considerably inferior to the average level of pine stands on EVT, and to a major part on ECT. The mixed pines on spruce sample plots have developed better than spruces of equal age. Spruce stands on VMT in the area developed markedly better than Geranium-Dryopteris-Myrtillus (GDMT) in Central Northern Finland.
It seems that a spruce stand seems to require more fertile site type in north than in the southern part of Finland. These fertile types are relative rare in the north. In the region, the best results are received with pine. As a rule, also the yield of birch (Betula sp.) is poor in the region.
The PDF includes a summary in English.
-
Ilvessalo,
E-mail:
yi@mm.unknown
According to the National Forest Inventory of Finland, the age structure of forests in Northern Finland require large-scale fellings. One of the problems is regeneration of low-productive Norway spruce (Picea abies (L.) Karst.) forests in the area. The objectives of this investigation were to study the natural development of Hylocomnium-Myrtillus (HMT) type Norway spruce forests in Northern Finland and the ecological causes of the development. A total of 83 sample plots were studied in 1950-52. The stands were chosen to have a total effective temperature during growing season between 600-800 ºC.
According to the results, the HMT type forests represent secondary developmental stages of the northern Myrtillus type, characterized by tree stands of poor quality. By returning the habitats that have reached their secondary stages to their primary stage, e.g. by means of fires, the potential site quality is restored. The climax theory is inapplicable to the Northern Finland’s spruce stands on fresh site types. The natural development of HMT follows not the climax theory, i.e. a return in each succession to the same type stage expressing the same site quality. One reason is accumulation of the thick humus layer, caused by incomplete decomposition of litter. The humus binds nutrients inaccessible to the trees, and the substratum becomes cold, more acid, and moist.
These forests should be managed by clear-cutting, burning-over and artificial regeneration. When thinning the stands, at least a slight mixture of deciduous trees must be left in the stand.
The article is divided into two separate PDFs. The second PDF is in a supplementary file and includes a summary in Finnish.
-
Sirén,
E-mail:
gs@mm.unknown
The different kinds of injuries in Norway spruce (Picea abies (L.) Karst.) stands was studied in 52 sample plots in Peräpohjola in the northernmost Finland. The age classes of the stands varied from 100 years to over 220 years. Most of the stands were unevenaged, as is usual in the area.
In the younger age classes (121-160 years) majority of the trees were of normal quality or had smaller injuries in all forest types. In age classes over 160 years the trees of merchantable quality decreased markedly in all forest types. The quality of the trees decreases with the age especially because of butt rot, braking of trees and crooks, forks and heart and top decay caused by the injuries. To ensure future quality it would be important that the stand is healthy from the beginning. When old spruce stands of the area are in large extent diseased by the root rot, it is questionable if they can be regenerated using natural regeneration. The spruce stands of the area are also relatively branchy. This could be prevented by growing the young stands dense. Changing the dominant tree species to Scots pine (Pinus sylvestris L.) in the dry upland forest sites could be a way to improve the quality of the forests in the area.
The PDF includes a summary in German.
-
Tikka,
E-mail:
pt@mm.unknown
The article presents the studies about the vegetation communes on moisture soils in northern Finland. The studies are part of another study about calcium carbonate content of the soil as a factor influencing the vegetation.
The PDF contains a summary in Finnish.
-
Pesola,
E-mail:
vp@mm.unknown
The study includes a detailed survey of 154 farms in the area. Part of the results are presented in the second and third part of the article series about agriculture in Perä-Pohjola and Lapland. The typical breed of cattle in the area was the white Northern Finnish landrace (pohjoissuomenkarja). The size of herds in the farms varied from one to 25, but exceeded seldom 10 cows. Summer pastures were mostly forest pastures. For the winter hay and leaf fodder was gathered. The article includes a detailed description of cattle-keeping in the area. In addition, the farms often had horses and sheep. Keeping pigs or poultry was rare.
The PDF includes a summary in English. This is a fourth part of four-article series about the natural resources in the area of Perä-Pohjola and Lappi.
-
Jutila,
E-mail:
kj@mm.unknown
Perä-Pohjola and Lappi are situated almost entirely north of the Arctic Circle, being one of the northernmost areas, where agriculture and forestry are practiced. The state owns 87% of the land, of which 42% are productive forests. Only 0.8% of the land is agricultural land, mostly meadows. Agriculture is mainly dependent on animal husbandry. The most important agricultural crops were barley and potato. From the economic point of view, forestry is the most important industry in the area. Forestry also gives the agricultural population extra income, especially in the winter. The total population of the area was 31,488 in 1917. Development of the connections to the area is important for both agriculture and forestry.
The PDF includes a summary in English. This is a first part of four-article series on the natural resources in the area of Perä-Pohjola and Lappi.
-
Jutila,
E-mail:
kj@mm.unknown
The study is based chiefly on statistics of forest fires in the state forests in 1911-1921, published in the annual reports of Board of Forests (now Metsähallitus, Forest Service). Forest fires burned 37,200 hectares of forests in the state forests in 1911-1921. In Southern Finland the number of fires was 795 and in the Northern Finland 610. The frequency of forest fires is higher in south because of the denser population in the area. The average forest fire ranged 118 hectares in Southern Finland and 39 hectares in the north. Fires broke out most often because of careless use of fire. Weather conditions and the type of the forests influenced the risk of fire. In the north, risk for forest fire is lower because of the high proportion of peatlands. Only 14% of the fires burn the trees of the stand. In Southern Finland 50% of the fires and in Northern Finland 42% of the fires damage only part of the stand. Rest of the fires were surface fires that do not burn the trees. The value of damages by forest fires in the state forests in 1901-1922 was annually in average 139,400 Finnish marks.
The PDF includes a summary in English.
-
Saari,
E-mail:
es@mm.unknown
Category : Research article
-
Hallikainen,
Finnish Forest Research Institute, Eteläranta 55, FI-96301 Rovaniemi, Finland
E-mail:
ville.hallikainen@metla.fi
- Hyppönen, Finnish Forest Research Institute, Eteläranta 55, FI-96301 Rovaniemi, Finland E-mail: mh@nn.fi
- Pernu, Finnish Forest Research Institute, Eteläranta 55, FI-96301 Rovaniemi, Finland E-mail: lp@nn.fi
- Puoskari, Finnish Forest Research Institute, Eteläranta 55, FI-96301 Rovaniemi, Finland E-mail: jp@nn.fi
