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A PRELIMINARY STUDY OF PERIODICITIES IN PERCENTAGE CURVES DATED BY POLLEN DENSITY
Author(s) -
Wijmstra T.A.,
Hoekstra S.,
De Vries B.J.,
Van Der Hammen T.
Publication year - 1984
Publication title -
acta botanica neerlandica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0044-5983
DOI - 10.1111/j.1438-8677.1984.tb01845.x
Subject(s) - pollen , series (stratigraphy) , diagram , mathematics , environmental science , mineralogy , physical geography , statistics , geology , geography , botany , paleontology , biology
SUMMARY The refined dating technique based on both pollen density and radio‐carbon dating proposed by M iddeldorp (1982) was applied to five curves of a pollen‐ and macro‐remain diagram from a peat section from the Engbertsdijksveen (Vriezeveen, The Netherlands). Percentages curves of Alnus, Quercus, Corylus , alkaline soluble humic acids and coarse fraction of peat were then subjected to time series analysis by means of Periodic Regression (B riskin et al. 1980). In this way periodicities of approximately 1450, 1000, 800, 600, 500, 350, 200, 145, 85, 40 and possible 22 years could be established with reasonable confidence. Several of these periods seem to correspond to known sunspot cycles (22, 40, 80, 150, 200 and possibly 1000 years).