ISSN:
1573-515X
Keywords:
calcium content
;
DOC
;
liming material
;
pH
;
podsol
;
sulphur mineralization
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Geosciences
Notes:
Abstract Soil columns with O + A (Experiment I) or Ohorizons (Experiment II) from a Haplic Podsol wereincubated at 15 °C for 368 and 29 + 106 days,respectively. Three types of liming material differingin Ca2+ content, i.e. calcium carbonate(CaCO3), dolomite (CaMg(CO3)2) andmagnesium carbonate (MgCO3), were mixed into theO horizons in equimolar amounts corresponding to 6000kg of CaCO3 per ha. In the limed treatments ofExperiment I, the leaching of dissolved organic carbon(DOC) and the net sulphur mineralization (estimated asaccumulated SO 4 2− leaching corrected forchanges in the soil pools of adsorbed and waterextractable SO 4 2− ) increased with decreasingCa2+ content of the lime and increasing degree oflime dissolution. In relation to the controltreatment, only the MgCO3 treatment resulted ina significantly higher net sulphur mineralization. InExperiment I the net sulphur mineralization was 4.06,1.68, 0.57, and 2.14 mg S in the MgCO3,CaMg(CO3)2, CaCO3 and control treatment,respectively. The accumulated SO 4 2− leachingin Experiment II during the first 29 days was 1.70,0.74 and 0.48 mg S in the MgCO3,CaMg(CO3)2 and control treatment,respectively. In the two experiments there wereconsistently significant positive correlations betweenleached amounts of SO 4 2− and DOC. It wasconcluded that net sulphur mineralization was stronglyconnected to the solubilization of the organic matter(DOC formation) and that pH and/or Ca2+ ionsaffected the net sulphur mineralization through theireffects on organic matter solubility.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1006355532514
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