Holocen skogshistoria i Stenshuvuds nationalpark, Skånes östra kust, Sverige

Sammanfattning: A palaeoecological investigation of two peat deposits in the national park of Stenshuvud (N 55° 39´ 21´´, O 14° 16´ 06´´), southeastern coast of Sweden, was performed to date the immigration of tree species and study the landscape history during Holocene. The sequences were analysed for pollen and plant macrofossil. The chronology is based on 14 AMS-14C dates of plant macroremains from terrestrial species. The peat sequences cover the time periods 10 200-5 600 cal. yrs BP (Mossen) and 3 500 cal. yrs BP to present time (Stora alkärret). The immigration of trees was dated to 10 100-10 000 for Corylus, the same age or 9800 for Ulmus and Quercus, 10 000 or 9 450 for Populus, 9 100 for Tilia, and 7 200 for Fraximus (all ages in calibrated years BP). In comparison to the traditional pollenstratigraphical chronology of Scania, the age of the expansion of Corylus (10 800 at Ageröds mosse) shows the largest discrepancy. Datings of seeds of Alnus glutinosa show that the species was growing locally already ca. 10 150 cal. yrs. BP, much earlier than the time indicated by pollen analysis (around 9 400-9 500). There was no major human impact on the landscape at Stenshuvud before ca. 1 000 BP. Fagus arrived late in the area (400-200 BP). Periods of drier climatic conditions are indicated around 10 000, 9 350, and 7 500 cal. yrs. BP. The age of paludification at Stora alkärret agrees with the time of regional climatic change towards more humid conditions around 3 700 cal. yrs. BP.