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Fältarbete på Färskesjön 2013

Anne Birgitte Nielsen

Universitetslektor

Fältarbete på Färskesjön 2013

The effect of climate conditions on inter-annual flowering variability monitored by pollen traps below the canopy in Draved Forest, Denmark

Författare

  • Anne Birgitte Nielsen
  • Peter Friis Møller
  • Thomas Giesecke
  • Beth Stavngaard
  • Sonia L. Fontana
  • Richard Bradshaw

Summary, in English

Since 1967 annual pollen deposition has been monitored in the semi-natural mixed deciduous woodland Draved Forest by the Geological Survey of Denmark. In this paper, we analyse the variability in pollen accumulation rates for the eight most common deciduous trees, and their relationships to monthly temperature and precipitation. High summer temperatures in the year before flowering have a positive effect on pollen deposition for several species. A positive correlation between temperatures during the flowering season and pollen accumulation rates is found for Fagus sylvatica, Quercus robur, Fraxinus excelsior and Corylus avellana. The amount of precipitation can have both positive and negative effects on pollen accumulation, depending on species and on time of year. Linear modelling showed that combinations of monthly climate parameters could explain between 10 and 80% of the variation observed in different species. There were marked differences in the time series of pollen accumulation and pollen/climate relationships for some species between traps within the forest related to the location of trees near the traps. This underlines the importance of using multiple traps in a region for this type of study. Time series analyses were used to test for cyclicity in pollen accumulation rates, which could be caused by resource limitations or internal biological factors. No significant autocorrelations were found, although Alnus glutinosa showed a tendency towards 3-year cyclicity. These results indicate that, with the possible exception of Alnus glutinosa, temperature and precipitation are the main factors controlling the annual variability in pollen deposition of the trees in Draved Forest.

Publiceringsår

2010

Språk

Engelska

Sidor

309-323

Publikation/Tidskrift/Serie

Vegetation History and Archaeobotany

Volym

19

Issue

4

Dokumenttyp

Artikel i tidskrift

Förlag

Springer

Ämne

  • Geology

Nyckelord

  • Pollen monitoring
  • Annual pollen accumulation rates
  • Temperature
  • Precipitation

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0939-6314