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围海造田水稻土磷吸附动力学特征及其机理

Mechanism and Characteristics of Phosphorus Adsorption Dynamics of Foreshore Reclamation Paddy Soils

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【作者】 刘辉刘忠珍杨少海胡正义赵言文

【Author】 LIU Hui1,2,LIU Zhong-zhen1,YANG Shao-hai1,HU Zheng-yi2,3,ZHAO Yan-wen4(1 Soil and Fertilizer Institute,Guangdong Academy of Agricultural Sciences,Guangzhou 510640,China;2 State Key Laboratory of Soil and Sustainable Agriculture(Institute of Soil Science,Chinese Academy of Sciences),Nanjing 210008,China;3 College of Resources and Environmental Sciences,Graduate University of Chinese Academy of Sciences,Beijing 100049,China;4 Nanjing Agricultural University,Nanjing 210095,China)

【机构】 广东省农业科学院土壤肥料研究所土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所)中国科学院研究生院资源与环境学院南京农业大学

【摘要】 沿海农田N、P排放是沿海湿地和近海水质污染源之一。研究围海造田土壤P化学行为对评价其水质污染风险,制定兼顾农业生产和环境保护P肥管理措施具有实际意义。本研究以浙江省慈溪市3个代表性时期(宋代,明代,现代)围海造田水稻田土壤为研究对象,研究了3种温度条件下(15℃,25℃,35℃)土壤P吸附动力学,并获得了其热力学参数。结果表明:①水稻土的P吸附动力学曲线可用Langmuir、Freundlich及Temkin等温吸附方程拟合,而以Freundlich方程的拟合度最高;水稻土壤P吸附热(△H0)分别为4.39,11.40,15.97 kJ/mol,对照前人的研究结果,推测围海造田土壤P吸附作用力是氢键力和偶极间力为主。②土壤最大吸附量(Qm)依次为:宋代>明代>现代土壤,说明,随着种植年限延长,土壤保持P容量增加,土壤固P能力增强。土壤最大吸附量(Qm)与有机质之间呈线性正相关(p<0.01),因此,增施有机肥提高土壤有机质有利于增强土壤P吸附能力。随着温度的上升,土壤最大吸附量逐渐增大,建议选择高温季节使用P肥,可有利于P吸附,降低农田土壤P排放污染风险。

【Abstract】 Emissions of nitrogen and phosphorus(P) from coastal farmlands are one of water pollution sources of coastal wetlands and water body.The knowledge on phosphorus chemical behavior of the foreshore reclamation paddy soils can help evaluate water pollution risks of agricultural production and develop environmental friendly P management measures.The dynamics of phosphate adsorption at three temperatures(15℃,25℃,35℃) were investigated in the foreshore reclamation paddy soils originated at three historical periods(Song dynasty,Ming dynasty and Present age) in Cixi,Zhejiang,and thermodynamics parameter and of P adsorption in these soils were also estimated.The results showed that: 1) Kinetic curves of phosphate adsorption could be well described by Langmuir,Freundlich and Temkin equations with the best fitness of Freundlich equation,the sorption parameters of thermodynamics(△H0) were 4.39,11.40,15.97 kJ/mol,respectively;P sorption could be dominated by hydrogen bond forces and dipole bond forces referenced to the results of Von Open(1991).2) The Qm for these paddy soils tested followed the decrease order as bellow: Song dynasty>Ming dynasty>Present age,implying that capacity of soil phosphorus adsorption increased with the increase of rice-planting duration.The Qm was significantly positively correlated with soil organic matter(SOM)(p<0.01).Therefore,application of organic fertilizer induced to increase of SOM could be conducive to increase soil P adsorption capacity.Qm increased with increasing temperature suggested that phosphate fertilization could be used in summer to reduce the risk of P loss risk from soils.

【基金】 国家自然科学基金重点项目(NSFCNo.40335047);国家科技支撑计划项目(2006BAJ10B04—2);广东省自然基金博士启动项目(8451064001001121)资助
  • 【分类号】S158
  • 【被引频次】7
  • 【下载频次】237
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