Accumulation rates of estuarine sediment in the Dollard area: comparison of 210Pb and pollen influx methods
Heijnis, H.; Berger, G.W.; Eisma, D. (1987). Accumulation rates of estuarine sediment in the Dollard area: comparison of 210Pb and pollen influx methods. Neth. J. Sea Res. 21(4): 295-301
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579; e-ISSN 1873-1406, meer
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| Auteurs | | Top |
- Heijnis, H.
- Berger, G.W.
- Eisma, D., meer
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| Abstract |
Profiles of excess 210Pb activity in sediment cores collected on the muddy tidal flats of the Dollard indicate deposition rates ranging from 0.14 to 0.27 cm·y-1. One profile was also analysed for pollen: the pollen profile in the core provided a record of the sedimentation rate because two independent historical events were found recorded in the profile. The first, a sudden abundance of an Aster-type pollen, reflected, at a depth of 33 cm in the sediment, the large land reclamation of 1862 A.D. The second, the appearance of Zea mays (corn) at a depth of 6 cm, reflected the increase of the area in which corn was cultivated: from 44 ha in 1970 up to 552 ha in 1973. The pollen data gave an estimated sedimentation rate of 0.25 cm·y-1. Excess 210Pb analysis of the same core yielded a sedimenta. tion rate of 0.27 cm·y-1. |
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