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Dissolved organic carbon fluxes in spruce stand throughfall and soil water in the Moravian-Silesian Beskids.

Author(s): Ida Drápelová | Jiří Kulhavý

Journal: Časopis Beskydy
ISSN 1803-2451

Volume: 2;
Issue: 1;
Start page: 9;
Date: 2009;
Original page

Keywords: DOC | lysimeter | soil solution | throughfall | Moravian-Silesian Beskids | Norway spruce

Dissolved organic carbon (DOC) is an important component of the carbon cycle in forest ecosystems. Concentrations and fluxes of dissolved organic carbon are relatively small when compared with forest ecosystem C-fluxes with litterfall or respiration but are important for carbon transport downward the soil profile and thus for carbon sequestration. This study gives the first assessment of DOC fluxes for a forest ecosystem with Norway spruce plantation at the experimental site at Bílý Kříž in Moravian--Silesian Beskids. Concentrations of dissolved organic carbon were monitored in atmospheric precipitation, throughfall and lysimetric waters sampled in regular fortnight intervals during the years 2001, 2002 and 2008. Precipitation and throughfall were collected by permanently open samplers, soil water was sampled with zero-tension and vacuum lysimeters. Annual precipitation totals, mean annual concentrations of DOC in bulk precipitation and throughfall, deposition fluxes of DOC and DOC fluxes through soil profile were evaluated. The annual precipitation totals were 1504, 1431and 1068 mm, the annual input flux of DOC with atmospheric precipitation was 1.9, 2.3 and 1.8 g C m−2 a−1, throughfall flux of DOC amounted to 7.9, 8.1 and 6.7 g C m−2 a−1. DOC fluxes through the soil were decreasing with increasing depth giving the flux of 40 g C m−2a−1 under the forest floor (5 cm depth), 11 g C m−2 a−1 in the depth of 20 cm, and about 2 g C m−2 a−1 in the depth of 40 and 60 cm. These values were compared with data published for several coniferous forest sites in Europe.
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