Liming effect on sulphur and nitrogen mineralization in a forest soil and their relationships with organic carbon

摘要

Limed and unlimed mor humus and litter were collected from a Haplic Podsol in southern Sweden. The treated samples were limed with 8.8 tons of dolomite per ha in the year 1984. A leaching experiment was performed by incubating limed and unlimed mor humus with and without litter on top in columns for 106 days at +15 deg C. On seven occasions the columns were irrigated with an artificial throughfall solution similar to the precipitation at the site. The leachates were analyzed for SO4-S, NH4-N, NO3-N, pH, electrolytic conductivity and the dissolved organic compounds containing sulphur (DOS), nitrogen (DON) and carbon (DOC). The evolution rate of CO2 (i.e. biological activity) in the columns was periodically determined during the incubation. A strongly significant positive liming effect was found for the dissolved organic compounds of sulfur, nitrogen, and carbon.