摘要：The aim of this study was to determine how accumulation of organic matter on the forestfloor (logging residue piles) is reflected in the soil solution concentrations of dissolvedorganic C and N and other nutrients. The data were collected from a logging residue experiment7 years after a clear-cut harvest of a Norway spruce stand growing on sandy soil. Thesolution retained in the soil matrix was extracted from soil samples by the centrifugationmethod. The study site was located in Paltamo, Finland. The logging residue levels were:(1) 40 kg m–2, (2) 10 kg m–2, and (3) 0 kg m–2 of fresh spruce branches. The DOC andDON concentrations were higher in the organic layer in the centrifuged soil solution dueto organic matter accumulation on the forest floor as compared to the treatment where noaccumulation had occurred, and these higher levels were persisting still seven years afterthe logging residues had been piled on the site. The NO3-N and NH4-N concentrationswere generally very low. It was possible to accurately estimate the anion deficit based onthe DOC concentration in the soil solution, and the increased concentration of DOC andorganic anions strongly influenced the ionic balance of the centrifuged soil solution.
