Calculating net annual accumulation rates of sediment components exemplified by pollen

The net annual accumulation rate of a sediment component can easily be estimated by determining the total content of the specific component (x) in a sediment sample, which represents a known number of years (yr) and certain area of the lake bottom (a), using the formula: annual accumulation = x/(yr...

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Bibliographic Details
Published in:Hydrobiologia 1986-12, Vol.143 (1), p.45-47
Main Authors: SEGERSTROM, U, RENBERG, I
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
Freshwater
Hydrology. Hydrogeology
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Summary:The net annual accumulation rate of a sediment component can easily be estimated by determining the total content of the specific component (x) in a sediment sample, which represents a known number of years (yr) and certain area of the lake bottom (a), using the formula: annual accumulation = x/(yr multiplied by a). To illustrate and test this procedure the authors have calculated mean net annual accumulation rates for sediment dry matter, mineral matter, organic matter and pollen grains of Scots Pine (Pinus sylvestris L.) for one short sequence of a varved lake sediment core. This paper includes descriptions of a simple method for sub-sampling fresh cores of consolidated sediments and an alternative method for making absolute pollen counts. The test results clearly show that in varved sediments quantitative sediment samples can be cut out with very high precision, i.e. the variable a and in this case also yr can be very accurately determined.
ISSN:0018-8158
1573-5117
DOI:10.1007/BF00026643