Effects of Selected Natural Factors on Soil pH and Element Dynamics Studied in Columns of Pyritic Sediments

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概要

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• Two sets of column (70 cm)-leaching experiments were carried out by using pyritic marine sediments of Kojima lake (Okayama, Japan) to evaluate the influence of soil microorganisms (SMO), duration of oxidation, intensity of rainfall, and groundwater level on the changes in soil pH and dynamics of associated elements. The soil contained 6.5 g kg^<-1> pyrite, 43 g kg^<-1> organic carbon, and had a pH value of 8.0 determined by the sticky point method. The pH of the non-sterile soils (with SMO=set I) showed an acidic range (pH<6.5) after 2 weeks of incubation. A pronounced decrease of the pH (3-4) was detected during the 32-week period of incubation, while a more alkaline range of pH (>8.5) was recorded at the lower depths (40-50 cm) with the passage of time in most of the soils initially sterilized (without SMO=set II). When the water (25±2% air v.) content was about 200%, the pH of the non-sterile soils was less than 6 after 16 weeks of incubation, while for the same water content at 32 weeks after incubation, the pH of the soils was about 1 unit lower than that of the 16 weeks after incubation. However, the pH in sterilized soils was less than 6 after 32 weeks of incubation for a water content of about 150% (40±2% air v.), whereas, at such (40±2% air v.) levels of water or oxygenation, the pH of the soils decreased to about 3 in all the treatments with SMO. Application of rainfall and changes in the groundwater significantly (p≤0.01) enhanced the development of acidity in the top soils (0-15 cm) through leaching losses of Ca^<2+> and Mg^<2+>, and led to a substantial increase of the amounts of water-extractable Fe^<3+> and Al^<3+>, indicating that the soils may have become permanently acidic through leaching.

• 社団法人日本土壌肥料学会の論文

著者

• Adachi Tadashi

  Faculty Of Agriculture Okayama University

• Khan Harunor

  Department Of Soil Science University Of Dhaka

• Adachi Tadashi

  Faculty Of Engineering And Environmental Sciences Okayama University

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