TY - JOUR
T1 - The effect of climate conditions on inter-annual flowering variability monitored by pollen traps below the canopy in Draved Forest, Denmark
AU - Nielsen, Anne Birgitte
AU - Møller, Peter Friis
AU - Giesecke, Thomas
AU - Stavngaard, Beth
AU - Fontana, Sonia L.
AU - Bradshaw, Richard H.W.
N1 - Funding Information:
We dedicate this contribution to the memory of Svend Th. Andersen for his outstanding work on the understanding and quantifying of pollen dispersal and pollen vegetation relationships, much of which was carried out in Draved Forest. We gratefully acknowledge Sheila Hicks for her long lasting and inspiring involvement in palaeoecology and especially pollen monitoring. We thank Bent Odgaard, Christian Kamenik and Pim van der Knaap for comments and suggestions which improved the manuscript. Finally, we thank the Carlsberg Foundation, The Danish Research Council and GEUS for financial support of the trapping programme.
PY - 2010/8
Y1 - 2010/8
N2 - 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.
AB - 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.
KW - Annual pollen accumulation rates
KW - Pollen monitoring
KW - Precipitation
KW - Temperature
UR - http://www.scopus.com/inward/record.url?scp=77955581329&partnerID=8YFLogxK
U2 - 10.1007/s00334-010-0253-3
DO - 10.1007/s00334-010-0253-3
M3 - Article
SN - 0939-6314
VL - 19
SP - 309
EP - 323
JO - Vegetation History and Archaeobotany
JF - Vegetation History and Archaeobotany
IS - 4
ER -