Vascular plant and moss species across successional mire basins on the land uplift coast of Northern Ostrobothnia, Finland

Kirjoittajat

• Sakari Rehell Metsähallitus, Parks & Wildlife
• Jarmo Laitinen Dept. of Biology, University of Oulu

Abstrakti

Succession of mire vegetation was studied in mire basins providing uniform chronosequences on the land uplift coast of the Bothnian Bay. The research was performed from transects crossing mire basins with similar hydrology in order to highlight the occurrence on different mire species in catchment areas. Material from vegetation sample plots was used, central species for each altitude belt were presented. Also the differences between the mire basins on moraine and sand were handled. On the mires under 5 m asl, the vegetation is dominated by species typical for swamps and seashores. Most Sphagnum species spread to the mire basins very quickly after the disappearance of the brackish sea-water effect. Along with the Sphagna are spreading most species typical for the mature hummock, lawn and carpet levels. The occurring of rich fen species seems to be closely connected with the groundwater discharge pattern. The study areas are situated on the coast of northern Bothnian Bay, where the developed mire systems are dominated by aapa mires. The results are compared with those from the more southern zone of bogs. The main difference seems to be the larger coverage of Sphagnum mosses even on the wetter sites on the development of bogs.