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- W4233669781 abstract "Reference pollen:vegetation data for use in interpreting fossil pollen assemblages may either be collected as surface samples or monitored by means of pollen traps. Surface samples can consist of moss polsters or lake-surface sediment, or exceptionally soil, leaf litter, or snow. The advantage of such samples is that a large number can be collected relatively quickly. Within the resulting pollen assemblage, however, the presence of each taxon has to be expressed in percentage terms. Reference material obtained from pollen traps offers more possibilities since pollen accumulation rates (PARs, grains cm−2 yr−1) can be calculated and the record of each taxon can be considered independently. This allows comparisons over distance and between vegetation regions. The collection of such data requires several years since the annual variation in pollen production, which is determined by climate, is great and it is only the long-term average PAR which reflects vegetation abundance. The number and location of samples and the degree of accompanying vegetation data should be appropriate for the research question to which they will be applied since there is no single standard that is suitable for the whole range of possible uses." @default.
- W4233669781 created "2022-05-12" @default.
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- W4233669781 date "2007-01-01" @default.
- W4233669781 modified "2023-09-25" @default.
- W4233669781 title "Surface Samples and Trapping" @default.
- W4233669781 doi "https://doi.org/10.1016/b0-444-52747-8/00179-4" @default.
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