| 南方土壤酸沉降敏感性研究Ⅶ——盐基淋溶与缓冲机理 |
| 摘要点击 1244 全文点击 1844 投稿时间：1997-01-25 |
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| 中文关键词 酸雨 盐基离子 淋溶 土壤敏感性 |
| 英文关键词 simulated rain base cations leaching soil sensitivity |
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| 中文摘要 |
| 研究了模拟酸雨对我国南方主要土壤类型盐基离子淋溶的影响,结果表明,pH低于3.0或3.5时,盐基离子淋溶总量明显增加,但pH高于3.5时,则影响不明显。相对于二价Ca2+、Mg2+,K+、Na+淋溶释放受模拟酸雨影响不大。在不同模拟pH阶段,土壤可能由于不同的缓冲与反应机制而导致盐基释放。pH高于3.5时,以溶解淋溶为主,pH=3.5时,以离子交换反应为主,pH低于3.5时,阴离子吸附、矿物风化及粘土的铝边缘和铝氧化物的溶解均可能对土壤离子释放造成影响。 |
| 英文摘要 |
| Acidic deposition is considered an environmental problem that may affect the soil's cation exchange status.This study used column leaching experiments to examine the influences of simulated acid rain with different pH values on base cation leaching of main soil types collected from South China.The results showed that amounts of leaching base cations increased obviously when the pH value of simulated acidic rain was lower than 3.0 or 3.5,while the amounts almost did not differ when pH higher than 3.5. The leaching of Ca2+ and Mg2+ was affected evidently by the pH value of simulated acidic rain,compared with the leaching of K+ and Na+.The H+ buffering mechanisms which may vary in different simulated pH acidic rain are proposed for main soils studied.The dissolving reaction of salts was the dominant resources of leaching base cations and H+ buffering when pH value higher than 3.5. The mechanisms of H+ buffering treated with acid rain at pH 3.5 were the exchangeable cations and sulfate sorption. Dissolved aluminum on the broken edge of clay and aluminum oxides weathering of original and secondary minerals and sorption of sulfate played a grea role on the leaching of soil cations and H+ buffering when the soils treated with acid rain of pH lower than 3.5. |
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