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In the Biatowieża National Park a study has been carried out to determine annual net production of the ground flora in two different areas of the association Circaeo-Alnetum Oberd., 1953, and the amount of organic fall accumulated during a three-year period. The value of the annual production of the ground flora in the area typical of the association was estimated at 1075 kg/ha, and the average amount of fall – at 4386 kg/ha. In the typical area of the association the ratio between the value of the fall and the production of the ground flora was 4.1, and in the degraded-association area – 1.9. The fall of seeds and woody parts was found to vary considerably from year to year, whereas the variation of the remaining fractions of the organic fall was much smaller. During a year in the association studied the total amount of matter, from the ground flora and the organic fall, returned to the soil is almost 5000 kg/ha.
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Projects co-financed by:
Operational Program Digital Poland, 2014-2020, Measure 2.3: Digital accessibility and usefulness of public sector information; funds from the European Regional Development Fund and national co-financing from the state budget.