Abstract
Analysis of the vegetation cover is an important part of plant ecology, and the monitoring of temporal changes in the abundance of different plant species is important in relation to the biodiversity aspects, for example. In addition, floristic mapping produces information on species ranges and the abundance of rare plant species. The abundance and occurrence of understorey plant species has also been used as an indicator of site fertility. Assessment of the vegetation forms a part of some national forest inventories, as on the permanent sample plots of the National Forest Inventory (NFI) in Finland. The aims of specific inventories of wild berries and mushrooms differ from those of other vegetation inventories, however, as interest may be focused on only the part of the population, those berries that are important for picking. Important aspects are then the prediction of annual yields and the time of ripening and the analysis of regional variability in yields.
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