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黄传琴,熊娟,常明慧,谭文峰.土壤腐殖酸与碳酸盐相互作用过程研究[J].华中农业大学学报,2018,37(06):58-65
土壤腐殖酸与碳酸盐相互作用过程研究
Interaction process between soil humic substance and carbonate
  
DOI:
中文关键词:  土壤  腐殖质  胡敏酸  富里酸  方解石  吸附  溶解
英文关键词:soil  humus  humic acid  fulvic acid  calcium carbonate  adsorption  dissolution
基金项目:国家自然科学基金项目(41330852;41671234)
作者单位E-mail
黄传琴 华中农业大学农业部长江中下游耕地保育重点实验室武汉 430070 hcq@mail.hzau.edu.cn 
熊娟 华中农业大学农业部长江中下游耕地保育重点实验室武汉 430070  
常明慧 华中农业大学农业部长江中下游耕地保育重点实验室武汉 430070  
谭文峰 华中农业大学农业部长江中下游耕地保育重点实验室武汉 430070 tanwf@mail.hzau.edu.cn 
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中文摘要:
      以湖北省九宫山土壤腐殖酸和合成的方解石(CaCO3)为研究对象,对比分析胡敏酸(JGHA)和富里酸(JGFA)与方解石的吸附与溶解过程,结合对吸附前后物质的表征,探讨二者间的作用特征及影响因素。结果表明:方解石选择性吸附相对分子质量较高、结构较复杂的腐殖酸组分,且吸附过程符合Langmuir方程( R2>0.95)。JGHA相对分子质量大,在方解石表面的吸附量大于JGFA,但吸附密度远小于JGFA。方解石对JGHA和JGFA的吸附量随pH值的升高而减小,表明吸附过程具有pH依赖性;方解石吸附JGHA的pH依赖性强于JGFA,且pH依赖性随腐殖酸浓度的增大而增强。疏水性强的JGHA分子吸附于方解石表面而抑制其溶解,相对分子质量小、酸性官能团含量高的JGFA促进方解石的溶解;JGHA和JGFA对方解石溶解的影响随腐殖酸浓度的增大而增强。本研究表明,干旱、半干旱区含碳酸盐土壤中有机碳的吸附固定与稳定性、无机碳的溶解与沉淀取决于土壤有机质的分子特性及官能团组成。
英文摘要:
      Knowledge of the interaction characteristics between soil humic substance and carbonate is important for better understanding of the coupling relationship between soil organic carbon and inorganic carbon.Soil humic substance from Jiugong Mountain in Hubei and synthetic calcite were selected for studying the adsorption of humic acid (JGHA)/fulvic acid (JGFA) on calcite and its dissolution process.The interaction characteristics and influence factors were illuminated by comprehensive analysis of JGHA/JGFA before and after adsorption and JGHA/JGFA-calcite complex.The results showed that a preferential adsorption of humic substance components with higher molecular weight and complex structure on calcite surface has occurred.Sorption isotherms of JGHA/JGFA on calcite followed Langmuir type behavior with a correlation coefficient R2>0.95.The adsorbed JGHA amount was higher than that of JGFA.The adsorption density of JGHA was far lower than that of JGFA.The adsorbed amount of JGHA/JGFA on calcite decreased with increasing pH which signified a strongly pH-dependent.The pH-dependent of JGHA is stronger than that of JGFA and increased with increasing humic substance concentration.Dissolution of calcite was inhibited by the absorbed hydrophobic molecules of JGHA on the calcite surface,while JGFA with lower molecular weight and higher amount of acidic functional groups promoted the dissolution of calcite.The effect of JGHA/JGFA on calcite dissolution was enhanced with increasing humic substance concentration.Adsorption and sequestration of organic carbon and its stability,dissolution and precipitation of inorganic carbon in arid and semi-arid soil rich in cacium carbonate are depended on the molecular properties and functional group composition of soil organic matter.
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