Kartlegging av truete vegetasjonstyper. Erfaringer fra Inderøy og Levanger

Endangered vegetation types have been mapped in the municipalities of Inderøy and Levanger in order to evaluate how well the vegetation types are covered by the municipal mapping of valuable nature types. In Inderøy the mapping is compared with the existing survey of valuable nature types, and in Levanger registrations are made to increase our experience in mapping of endangered vegetation types. The project shows that endangered vegetation types are fairly well covered by the mapping of nature types, where this is carried out by experienced vegetation ecologists. Vegetation mapping based on field surveys is neces-sary for most of the nature or vegetation types. It gives a better survey of the species content, which can lead to more localities withvaluable nature types being recorded, and it is also an important contribution to the valuation of the localities. Studies using aerial photos or satellite images are well suited for recor-ding of particular mire types, although field surveys are necessary in order to map nutrient gradients, flora and vegetation. It is recommended that this project is followed by mapping of endangered vegetation types in a number of municipalities selected at random, which has already carried out mapping of nature types. Furthermore, that emphasis is put on increasing the knowledge about variation and distribution of vegetation types within the various nature types.