Suo - Mires and peat vol. 40 no. 1 | 1989
Metsäojitettujen soiden luokittelu.
English title: Classification of peatlands drained for forestry.
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In the Finnish classification of drained peatlands in practical forestry, the post-drainage successional plant communities of recently drained areas have been traditionally classified according to their original mire site type (33 different types in forestry use), whereas the more stable communities of older drainage areas have been classified into so called "drained peat-land forest types" (4 types). This system is not firmly based on ecological factors or forestry requirements. The classification would be more logical and operational in forestry, if the successional plant communities of younger drainage areas already were classified into the drained peatland forest types. The paper describes seven such drained peatland forest types: herb-rich type, Vaccinium myrtillus type (I) and (II), Vaccinium vitis-idaea type (I) and (II), dwarf-shrub type and the Cladina type, which have their parallels in the series of upland forest types. The traditional V. myrtillus and V. vitis-idaea types have each been divided into two types; type (I) develops from genuine, forested mire types and type (II) from treeless and sparsely forested composite types. The proposed classification is supported by tree stand and peat property data presented in the paper.
Keywords: Classification, drained peatlands, vegetation
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Laine,
Department of Peatland Forestry, University of Helsinki, SF-00170 Helsinki, Finland
Sähköposti:
ei.tietoa@nn.oo
Metsien uudistaminen vanhoilla ojitusalueilla.
English title: Forest regeneration in old forest drainage areas.
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There are 150 000 hectares of mature stands and about 270 000 hectares of low-yielding stands in forest drainage areas in Finland. Most of them are on transforming or transformed peatlands. Conditions of these areas for forest regeneration differ from those of virgin and newly ditched peat-lands. The paper presents a review of studies in forest regeneration in old drainage areas. Also the needs for further research is discussed.
Keywords: Drainage, regeneration, transformed mires
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Saarinen,
The Finnish Forest Research Institute, Parkano Research Station, SF-39700 Parkano, Finland
Sähköposti:
ei.tietoa@nn.oo
Korpirämeet ja karut korvet suomalaisissa suoluokitusjärjestelmissä.
English title: The place of spruce-pine mires and oligotrophic spruce mires in Finnish peatland site type classifications.
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In Finland three different mire classification systems can be distinguished: 1) those for ecological purposes based on detailed botanical surveys, 2) those for scientific forestry research purposes, and 3) more extensive systems for practical forestry purposes. All systems are based upon Cajan-der's site-type principle whereby habitats which are ecologically similar are considered to support a similar vegetation. The classification (site type names, analogy/correspondence, nutrient status level) of spruce-pine mires and oligotrophic spruce mires according to the above-mentioned systems is compared. Some criticism concerning especially the confusing naming of the same type is presented. The varying post-drainage suc-cession in these site type groups is also discussed. Finally an attempt to distinguish the more oligotrophic spruce-pine mires from the less oligotrophic ones is made.
Keywords: Drainage, mire classification, site type, succession, trophy
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Hotanen,
The Finnish Forest Research Institute, Joensuu Research Station, P.O. Box 68, SF-80101 Joensuu, Finland
Sähköposti:
ei.tietoa@nn.oo
Ojitusalueiden puunkorjuun ja metsänparannustöiden yhteensovittaminen.
English title: Combining of logging and forest improvement measures on forest drainage areas.
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The paper is partly based on a practical instruction procedure to combine harvesting and forest amelioration measures on forest drainage areas. It is simply a scheme of order and schedule presented in a table, the purpose of which is to serve as a guide for planning the order and timing of harvesting and forest amelioration practices. In efficient peatland forestry it is necessary to be aware of all the operations that will be required early in the planning phase which presupposes cooperation between different organizations. In the future, with the increase of additional drainage and ditch maintenance, the presented schedule (or similar working model) must be followed in order to avoid bad results in peatland forestry.
Keywords: Drainage, forest amelioration, harvesting, peatland
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Matilainen,
Forestry Board of Eastern Häme, Vesijärvenkatu 9D, P.O. Box 110, SF-15141 Lahti, Finland
Sähköposti:
ei.tietoa@nn.oo
Satakunnan suometsien kehitys vuosina 1977-1987.
English title: The development of peatland forests in Satakunta Forestry Board District between 1977 and 1987.
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The development of peatland forests over a 10-year-period (1977-1987) in Satakunta Forestry Board District, Western Finland, is presented, based on the results of the 7th and 8th National Forest Inventories. Over this period the amount of peatlands classified as forest land (MAI over bark over a 100 years rotation ≥ 1 m3ha-1) and the total volume and increment of peatland forests considerably increased, mainly as a result of drainage.
Keywords: Forest drainage, inventory, peatland forests
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Paavilainen,
Finnish Forest Research Institute, P.O. Box 18, SF-01301 Vantaa, Finland
Sähköposti:
ei.tietoa@nn.oo
Rämemäntyalkuperien kehityksestä kangasmaalla.
English title: Development of mire originated Scots pine on mineral soil.
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Scots pine (Pinus sylvestris) transplants (2+1+1 or 1+2 years old), the seeds of which had been collected from mire pines in different localities of South Finland, were planted in the early 1930s in a sandy Vaccinium site type at Tuusula (60°22´ N; 25°00´ E), north of Helsinki. The sample plots have been measured several times. At the time of the latest inventory the stands were about 50 years old. The stand development (standing volume, volume increment, dominant height, stem form) has been compared with the local mineral soil stands. The results show that seeds originated from mire pines produce offspring with form and growth (phenotypes) similar to those of pines originating from mineral soil.
Keywords: Hereditary, mire, Scots pine, stand development, stem form, peatland
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Päivänen,
Department of Peatland Forestry, University of Helsinki, Unioninkatu 40B, SF-00170 Helsinki, Finland
Sähköposti:
ei.tietoa@nn.oo
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