The relative frequencies of pollen from Sanjiaolongwan maar lake over 1000 years
Pollen sample assemblage data from the maar lake Sanjiaolongwan in northeastern China. Data is provided as the relative frequencies of pollen taxa.
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Most of the core was analyzed for pollen analysis at a 1-cm interval and in some places a 0.5-cm interval was used (total of 64 samples). Sediments samples were prepared using standard methods. Approximately 0.3 g of each sample was treated sequentially with 10% HCl, 10% KOH, HF and then with HCl, followed by ultrasonic sieving (mesh size 5 m). A known quantity of Lycopodium spores was added as an exotic marker before acid maceration. Slides were made with glycerin jelly with a wax seal, and stored in the State Key Laboratory of Biogeology and Environmental Geology of China University of Geosciences. Pollen and spores were identified and counted with a Nikon light microscope at ×400-1000 magnification. The 800-1000 terrestrial pollen grains were identified and counted for each sample. Pollen percentages were calculated based on the sum of total terrestrial pollen and were plotted using C2, version 1.5.