Tempo dekompozycji opadu organicznego podczas przemian siedlisk łęgowych Decomposition rate of the litter fall in the course of riparian habitat changes
Disturbances occurring in the riverside forest ecosystems also translate into the ability of litter
decomposition. Determination of the litter decomposition rate and the changes in its chemical
composition in the course of riparian habitat changes was the aim of the study. The study was
conducted in 2011 in Jezierzyca River Valley Landscape Park located partly on a floodplain of
Oder river (SW Poland). Two riparian forest habitats (Ficario Ulmetum−minoris) were selected for
the study: site L (riparian forest), immediately adjacent to the old river bed and site LZ (drying
riparian forest), bordering site L on the edge of the floodplain and adjacent to oak−hornbeam
forest (Galio sylvatici−Carpinetum betuli) that constituted site G. The study used the method of litter
bags. The research material was collected every quarter except for winter, during 2 years. The
decomposition rate of organic matter defined by the loss of organic matter, understood as the
difference between the previous and the current state. We analyzed content of total organic carbon,
total nitrogen and available phosphorus, potassium and magnesium in the litter fall. As the result,
decomposition occurred the most rapidly in the oak−hornbeam forest community and the slowest
in the drying riparian forest. Regardless of the type of forest community rate of decomposition
of the fresh organic matter is the highest in winter and spring. The highest content of organic
carbon and total nitrogen was observed in the oak−hornbeam forest, slightly lower in the riparian
forest, while the lowest in the drying riparian forest. Similarly the content of available phosphorus,
potassium and magnesium was presented. Along with the progressive decomposition, examined
material had increased Corg and N content, but reduced C/N ratio. In all analyzed forest com−
munities were found the release of P, K and Mg in the environment, which was the most intense
in spring and summer.
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