文章摘要
夏建国,何芳芳,罗 婉.蒙山茶园土壤组分对铝的吸附解吸动力学特征的影响[J].农业环境科学学报,2014,33(2):358-366.
蒙山茶园土壤组分对铝的吸附解吸动力学特征的影响
Effect of Kinetics Characteristics of Aluminum Adsorption-desorption by Components of Tea Garden Soil in Mengshan
  
DOI:10.11654/jaes.2014.02.022
中文关键词: 茶园土壤  土壤组分    吸附-解吸  动力学特征
英文关键词: tea soil  soil particles  aluminum  adsorption-desorption  kinetics
基金项目:
作者单位
夏建国 蒙山茶园土壤组分对铝的吸附解吸动力学特征的影响 
何芳芳 蒙山茶园土壤组分对铝的吸附解吸动力学特征的影响 
罗 婉 蒙山茶园土壤组分对铝的吸附解吸动力学特征的影响 
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中文摘要:
      为了探讨铝在土壤中迁移、转化的环境化学行为, 以蒙山茶园土壤为供试土壤,采用间歇法研究了原土及各粒级对铝吸附解吸的动力学特征,分析土壤有机质、游离氧化铁含量和CEC与铝的吸附解吸动力学特征的关系,以期为茶园土壤科学管理、降低茶叶中铝含量提供科学参考。结果表明:两种茶园土壤对铝的吸附量均随时间的延长而增加,以最大吸附量为例,紫色土表现为粘粒(1 009.26 mg·kg-1)>粉粒(510.17 mg·kg-1)>细砂粒(269.13 mg·kg-1)>原土(144.91 mg·kg-1)>粗砂粒(217.94 mg·kg-1),黄壤表现为粘粒(477.56 mg·kg-1)>粉粒(327.62 mg·kg-1)>原土(152.54 mg·kg-1)>细砂粒(136.90 mg·kg-1)>粗砂粒(174.61 mg·kg-1);两种土壤对铝均存在静电吸附和专性吸附,以60 min为界分为快速反应阶段和慢速反应阶段,吸附平衡时间为240 min;双常数方程及Elovich方程可以很好地描述两种土壤对铝的吸附解析动力学过程,方程拟合均能达到极显著水平(P<0.01);土壤的有机质、游离氧化铁、CEC与吸附速率呈显著或极显著正相关,与吸附速率的下降率呈显著负相关,而在解析阶段,三项指标与两种土壤的解析率相关性都不明显。
英文摘要:
      Soil aluminum(Al) availability is critical to tea growth. A study was carried out to examine adsorption and desorption kinetics of aluminum by bulk soil and different soil particles collected from Mengshan tea garden using intermittent method. Relationship of adsorption-desorption kinetics characteristics of Al with soil organic matter, free iron oxide content, and CEC was explored. In purple soil, maximum adsorption of Al was clay(1 009.26 mg·kg-1)> silt(510.17 mg·kg-1)>fine sand(269.13 mg·kg-1)> raw soil(144.91 mg·kg-1)>coarse sand(217.94 mg·kg-1), while it was clay(477.56 mg·kg-1)>silt(327.62 mg·kg-1)>raw soil(152.54 mg·kg-1)>fine sand(136.90 mg·kg-1)>coarse sand(174.61 mg·kg-1) in yellow soil. Electrostatic and specific adsorption contributed to Al adsorption by two soils. Adsorption of Al by soils increased with time, reaching an equilibrium in 240 min. Fast adsorption was complete at 60 min. Double constant equation and Elovich equation could fit the process of Al kinetics(P<0.01). Soil organic matter, free iron oxide, and CEC were significantly or extremely significantly positively correlated with Al adsorption rates, but not with Al desorption rates.
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