水土保持通报2025，Vol.45Issue(6)：1-11,11.DOI:10.13961/j.cnki.stbctb.2025.06.005
模拟酸雨对石灰性紫色土盐基离子和钼离子淋失的影响
Effects of simulated acid rain on leaching loss of base ions and molybdate ions in calcareous purple soil
摘要
Abstract
[Objective]The effects of acid rain on the leaching loss of base ions and molybdate ions in purple soil were analyzed in order to provide a scientific basis for understanding fertility changes and nutrient management in purple soil under acid deposition conditions.[Methods]Taking the calcareous purple soil developed from the parent material of the Jurassic Penglaizhen Formation(J3 p)as the research object,five leaching solution treatments were established to simulate acid rain with pH values of 2.5(T1),3.5(T2),4.5(T3),5.6(T4),and 7.0(deionized water,CK).[Results]① The pH value of the leachate showed a trend of rapid decline followed by gradual stabilization.In the early stage,the pH value of the leachate decreased by 6.17%,8.05%,3.75%,3.70%,and 2.01%for T1,T2,T3,T4,and CK,respectively.In the later stage,it stabilized within a range of±0.2 of the pH value of the 10th leachate.After two years of simulated acid rain leaching,the pH value of the leachate in T1,T2,T3,and T4 decreased by 0.22,0.39,0.32,and 0.29,respectively.Compared with the CK,the soil pH value decreased by 0.67,0.62,0.56,and 0.46,respectively.② The contents of base ions in the leachate exhibited a fluctuating decline with increasing leaching cycles,and the total leaching amounts generally decreased as the pH value of the leaching solution increased.The total leaching amounts of K+followed the order:T1>T3>T2>T4>CK.The total leaching amounts of Na+followed the order:T1>CK>T2,T3,T4.The total leaching amounts of Ca2+followed the order:T1>T2,T3>T4>CK.The total leaching amounts of Mg2+followed the order:T1>T3>T4>CK,T2.The total leaching loss amounts of base ions were in the order:Ca2+>Mg2+>Na+>K+.③ The Mo4+content in the leachate showed a fluctuating decreasing trend,and the total leaching amount generally increased with increasing pH value,following the order:CK(59.22 μg)>T4(56.11 μg)>T3(52.42 μg)>T1(41.03 μg)>T2(39.56 μg).Mo4+was positively correlated with pH value and negatively correlated with K+and Ca2+.④ A synergistic relationship was observed between the leaching loss amounts of base ions and Mo4+.As the leaching loss of Mo4+increased,base ions first increased and then decreased.The total leaching loss amounts of K+,Na+,Ca2+,and Mg2+reached their peaks when the total leaching loss of Mo4+reached 46.11,46.11,44.51 μg,and 46.11 μg,respectively.[Conclusion]The T1 treatment of simulated acid rain(pH=2.5)results in the highest leaching loss of base ions but the lowest leaching loss of molybdenum.The leaching loss amounts of both base ions and the trace element molybdenum in the T3 treatment(pH=4.5)are at relatively high levels,indicating more severe nutrient loss.关键词
模拟酸雨/淋溶作用/盐基离子/钼离子/石灰性紫色土Key words
simulated acid rain/leaching/base ions/molybdate ions/calcareous purple soil分类
农业科技引用本文复制引用
Li Xueqin,Sun Xiaolin,Li Chunpei,Zhou Tao,Wang Xuan,Liu Gangcai..模拟酸雨对石灰性紫色土盐基离子和钼离子淋失的影响[J].水土保持通报,2025,45(6):1-11,11.基金项目
国家重点研发计划项目"干热河谷区多水源库容协同提升与优化配置关键技术"(2023YFD1901203) （2023YFD1901203）
