有机-中性化技术对旱作土壤镉有效性的长期影响

采用连续提取法测定了土壤中镉（Cd）的形态，以研究石灰或钙镁磷肥与猪粪或泥炭混施对田间条件下Cd污染土壤中Cd有效性的抑制效果．处理的第1年，猪粪使石灰对土壤Cd有效性的抑制率从18．2％提高到22．3％，使钙镁磷肥的抑制率从37．1％提高到50．8％；泥炭使石灰的抑制率从18．2％提高到57．1％，使钙镁磷肥的抑制率从37．1％提高到49．3％．处理的第4年，猪粪使石灰对土壤Cd有效性的抑制率从32．3％提高到44．2％，使钙镁磷肥的抑制率从38％提高到51．6％；泥炭使石灰的抑制率从32．3％提高到45．4％，使钙镁磷肥的抑制率从38％降低到8．2％．上述结果表明猪粪和泥炭在施用后第1年均可增强石灰和钙镁磷肥对土壤Cd有效性的抑制效果．到第4年，猪粪仍然促进了石灰和钙镁磷肥对Cd有效性的抑制效果，而泥炭增强了石灰的抑制效率但降低了钙镁磷肥的抑制效果．研究结果证明了有机-中性化技术对cd污染土壤的修复效果．石灰和钙镁磷肥大幅度提高了土壤Cd的碳酸盐结合态与专性吸附态，从而降低了土壤Cd的有效态（水溶态＋交换态）．

Long-term Effects of Organo-Neutralization on Cd Availability in a Cd-Polluted Dry Cropland Soil

The effects of mixed application of lime or calcium-magnesium phosphate with pig manure or peat on the fractions and availability of soil Cd were studied by analysing the soil samples collected from the plots of a field experiment that was conducted on a Cd-polluted land near a smelter for 5 years.One year after the application,the inhibition efficiencies of lime and calcium-magnesium phosphate for Cd availability were raised from 18.2% to 22.3% and from 37.1% to 50.8% by pig manure,respectively.The inhibit...