Patterns in recent and Holocene pollen accumulation rates across Europe – the Pollen Monitoring Programme Database as a tool for vegetation reconstruction

• Published in: Biogeosciences Vol. 18; no. 15; pp. 4511 - 4534
• Main Authors: Abraham, VojtÄch, Hicks, Sheila, Svobodová-Svitavská, Helena, Bozilova, Elissaveta, Panajiotidis, Sampson, Filipova-Marinova, Mariana, Jensen, Christin Eldegard, Tonkov, Spassimir, Pidek, Irena Agnieszka, ÅwiÄta-Musznicka, Joanna, Zimny, Marcelina, Kvavadze, Eliso, Filbrandt-Czaja, Anna, Hättestrand, Martina, KarlıoÄlu Kılıç, Nurgül, Kosenko, Jana, Nosova, Maria, Severova, Elena, Volkova, Olga, Hallsdóttir, Margrét, KalniÅa, Laimdota, NoryÅkiewicz, Agnieszka M, NoryÅkiewicz, Bożena, Pardoe, Heather, Christodoulou, Areti, Koff, Tiiu, Fontana, Sonia L, Alenius, Teija, Isaksson, Elisabeth, Seppä, Heikki, Veski, Siim, PÄdziszewska, Anna, Weiser, Martin, Giesecke, Thomas
• Format: Journal Article
• Language: English
• Published: Katlenburg-Lindau Copernicus GmbH 03-08-2021; Copernicus Publications
• Subjects: Accumulation; Bias; Biological fertilization; Biomass; Carbon dioxide; Data; Datasets; Environmental conditions; Fertilization; Fossil pollen; Fossils; Geographical distribution; Holocene; Land use; Monitoring; Motivation; Palaeoecology; Paleoecology; Paleogeography; Plant species; Pollen; Productivity; Reconstruction; Sediments; Species; Taxa; Traps; Trees; Vegetation; Europe; Finland
• ISSN: 1726-4189; 1726-4170; 1726-4189
• DOI: 10.5194/bg-18-4511-2021

The collection of modern, spatially extensive pollen data is important
for the interpretation of fossil pollen assemblages and the
reconstruction of past vegetation communities in space and time. Modern
datasets are readily available for percentage data but lacking for
pollen accumulation rates (PARs). Filling this gap has been the
motivation of the pollen monitoring network, whose contributors
monitored pollen deposition in modified Tauber traps for several years
or decades across Europe. Here we present this monitoring dataset
consisting of 351 trap locations with a total of 2742 annual samples
covering the period from 1981 to 2017. This dataset shows that total PAR
is influenced by forest cover and climate parameters, which determine
pollen productivity and correlate with latitude. Treeless vegetation
produced PAR values of at least 140 grains cm−2 yr−1. Tree PAR increased by at least 400 grains cm−2 yr−1 with each 10 % increase in forest cover. Pollen traps situated beyond 200 km of the distribution of a given tree species still collect occasional pollen grains of that species. The threshold of this long-distance transport differs for
individual species and is generally below 60 grains cm−2 yr−1. Comparisons between modern and fossil PAR from the same regions show similar values. For temperate taxa, modern analogues for fossil PARs are generally found downslope or southward of the fossil sites. While we do not find modern situations comparable to fossil PAR values of some taxa (e.g. Corylus), CO2 fertilization and land use may cause high modern PARs that are not documented in the fossil record. The modern data are now publicly available in the Neotoma Paleoecology Database and aid
interpretations of fossil PAR data.