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Dissolved carbon and nitrogen release from deadwood of different tree species in various stages of decomposition

Błońska, Ewa, Lasota, Jarosław, Piaszczyk, Wojciech
Soil science and plant nutrition 2019 v.65 no.1 pp. 100-107
Abies alba, Betula pendula, Picea abies, dead wood, electrical conductivity, inorganic carbon, leachates, lysimeters, nitrogen, pH, soil, total nitrogen, total organic carbon, trees, wood, Poland
The aim of study was to estimate how the deadwood of different tree species in various stages of decomposition releases dissolved organic carbon (DOC) and total nitrogen concentration. The deadwood of seven species (Common alder, Common aspen, Common ash, Silver fir, Norway spruce, Common hornbeam, and Silver birch) were selected. Three logs from each species in the third, fourth, and fifth decay classes were chosen for analysis. The investigation was carried out in Czarna Rózga Reserve in Central Poland. The leachate from deadwood was collected in lysimeters. Concentrations of total carbon (TC), inorganic carbon (IC), total organic carbon (TOC), and total nitrogen (TN) were determined. In our investigations, the concentration of TOC measure in filtered water samples was equal to DOC. Additionally, pH and electrical conductivity (EC) values were determined in water samples. The results confirmed the importance of the wood species and the stage of decomposition on the concentration of DOC and TN. Significant differences in the concentration of DOC and TN in leachates released between coniferous and deciduous species were noted. Most DOC and TN were released from decomposing hornbeam and aspen wood, the least DOC, and TN were released into the soil from coniferous species, especially the spruce.