Artikkelit kirjoittajalta Sirke Kajava

Summary: The habitats of particular significance referred to in the forest act 10 § include following mire site types: herb-rich spruce swamp woods, eutrophic fens (south of the Province of Lapland) and scrubland and wasteland sparsely treed mires. Lounais-Suomi forestry centre has invented those habitats of particular significance 1997-99. This matter was also studied by the 9th National Forestry Inventory (1998). The detailed directions concerning mire site types of habitats of the forest act are performed by quide Meriluoto & Soininen (1998). Also Lounais-Suomi forestry centre has observed mainly this quide. There is however a problem with some site types for ex. herb-rich sedge hardwood-spruce fens and herb-rich sedge birch-pine fens of scrubland and wasteland, which are not classified for habitats of the forest act. Because they are rare and there is no clear legal obstacle, those mire site types are also classified habitats of the forest act by Lounais-Suomi forestry centre. Only 25 % of the mires are in Southwest Finland are in virgin state and about 15 % of these mires are located in nature preserve areas. The inventory result of the forestry centre states, that there are 863 hectacres of mire habitats of particular significance referred to in the forest act in Southwest Finland mires, which is only 1.4 % of virgin mires outside nature preserve areas. NFI 9 found three times more habitats of the forest act than the inventory of the forestry centre, because NFI 9 cannot take into account territorial frequency of habitats and demand of small size of objective. However the distribution of mire site types is similar in both inventories. The inventory result of Lounais-Suomi forestry centre proves that there is a relatively small number of herb-rich level mire site types. Especially herb-rich sedge hardwood-spruce fen (RhSK) is very rare. It is important to classify all herb-rich level mires (taking into account the restrictions of the forest act) for habitats of the forest act in the future and also in natural state which is not wholly perfect. Nutrient-poor bogs are mainly consisted of virgin mire site types. They are often large mire complexes and in that sense not suitable habitats of the forest act. In this inventory nutrient-poor bogs represent one fourth of the total number. In the future it is sensible to choose only the most representative nutrient-poor bogs for habitats of the forest act.

• Silver, Sähköposti: ei.tietoa@nn.oo
• Kajava, Sähköposti: ei.tietoa@nn.oo