关键词: 模拟酸雨, 猪粪, 菜园土壤, 重金属, 有效性, DTPA

Abstract: Incubation experiment was employed to study the effects of simulated acid rain on availability concentrations of heavy metals from the vegetable soils amended with metal-rich swine manure. The results indicated that the acid rain affected the availability concentrations of heavy metals by decreasing the pH of soil. The available concentrations of Zn，Cd，Pb increased with the increasing of H⁺ concentration，whereas the opposite trend was observed for As. Furthermore，vegetable soil amended with metal-enriched swine manure as well as the inorganic heavy metals，would result in significantly higher available concentrations of Cu，Zn，and As. Therefore，the bioavailability of heavy metals from vegetable soil amended with either the manure or the inorganic heavy metal，would be affected by acid rain and exhibit potential risks to environment. As a result，long-term heavy application of metal-rich swine manures to vegetable soils in the southern areas subjected to frequent acid rain deposition would not only improve the nutrient conditions of vegetable soil，but also increase a potential risk of heavy metal contamination to soil environment and vegetables.

Key words: simulated acid rain, swine manures, vegetable soil, heavy metal, bioavailability, DTPA