|Title:||模擬酸雨對臺灣中部極育土陽離子淋溶的影響||Other Titles:||The Effects of Simulated Acid Rain on Cation Leaching of an Ultisol in Central Taiwan||Authors:||康敏捷
|Keywords:||模擬酸雨;鹽基陽離子;淋溶;Simulated acid rain;base cations;leaching||Issue Date:||Apr-1993||Publisher:||行政院環境保護署、行政院農業委員會、臺灣省政府農林廳||Start page/Pages:||227-241||Source:||臺灣地區空氣污染與農業氣象對作物生產影響研討會專輯||Conference:||臺灣地區空氣污染與農業氣象對作物生產影響研討會
Proceedings of The Workshop on Effects of Air Pollution and Agrometeorology on Crop Production in Taiwan
Acid rain enhanced cations leaching and soil acidification, particularly in sandy soils. Most researchers emphasized on the properties of acid rain, and paid less attention to investigate the influence of acid rain on soil properties. This study used column leaching tech nique to investigate the effects of simulated acid rains on cation leaching of an Ultisol of the Lien-hua-chi watershed in the central Taiwan. The results indicated that simulated acid rain increased cations Leaching from soils. The p11=2.6 simulated acid rain solutions had leached substantially more cations from soils than those of p11=3.6 and pH=4.6 simulated acid rains. This was bccause p11=2.6 simulated acid rain solutions contained more protons and sulfate ions , which exchanged with cations and dissolved aluminum from clays. The treatments of pH=3.6 and pH=4.6 acid rain solutions showed no major differences on cation leaching. Simulated acid rain solutions enhanced the leaching of exchangeable and dissolved aluminum from tested soils. The toxicity of aluminum might produce the ecological problems. The results also indicated that the top soils leached more cations than the deeper soils. However, when treated with pH=2.6 simulated acid rain, the pH of the leachate solution in surface soils decreased not stongly as those of underlying soils. This might result from relatively higher organic content in the soils. Three mechanisms were proposed to govern proton buffering capacity of the stud ied soils. The major mechanism of soils leaching with pH=2.6 simulated acid rain solutions, was the dissolution of aluminum oxides or Al in the clay complexes. Cation exchange and sulfate adsorption were the key factors governing the buffering of soils treated with pH=3.6 simulated acid rains. Exchangeable cations were the major factor for proton buffering capacity for soils treated with p11=4.6 simulated acid rains.
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