An evaluation of the microscopical counting methods of the tape in hirst-burkard pollen and spore trap
作者:
Markku Käpylä,
Antti Penttinen,
期刊:
Grana
(Taylor Available online 1981)
卷期:
Volume 20,
issue 2
页码: 131-141
ISSN:0017-3134
年代: 1981
DOI:10.1080/00173138109427653
出版商: Taylor & Francis Group
关键词: aerobiology;pollen trap;counting methods
数据来源: Taylor
摘要:
Three different sampling units in current use and different sampling strategies were tested. Randomly placed microscope fields are good in estimating the daily mean concentration, but very big sample size is needed. Traverses across the slide in systematic order are best to estimate the shortterm concentrations and diurnal variation. A formula for the estimation of the error in one transverse traverse is given. Twelve transverse traverses in systematic order is also enough to estimate the daily mean concentration. One or two traverses along the length of the slide give often unreliable estimates because of the irregularities in the transverse variation of the particle concentrations on the slide. For the same reason it is not safe to choose an “effectively collecting area”. Instead the whole width of the tape should be studied.
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