Phosphorus Sorption-Desorption Characteristics of Selected Acid Upland Soils in Indonesia
Phosphorus Sorption-Desorption Characteristics of Selected Acid Upland Soils in Indonesia
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DOI：
10.1111/j.1747-0765.2005.tb00113.x
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发表时间：
2005-10
影响因子：
2
通讯作者：
A. Hartono;Shinya Funakawa;T. Kosaki
中科院分区：
文献类型：
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作者：
A. Hartono;Shinya Funakawa;T. Kosaki
研究了印度尼西亚几种不同母质的酸性旱地土壤中磷的吸附-解吸等温线。土壤的化学和物理性质各不相同。用Langmuir方程对P的吸附特性进行了满意的描述，该方程用于确定P的吸附最大值和键能。土壤对磷的吸附能力差异很大，最大吸附量为0.294 ~ 1.43 × 103 mg P kg - 1（平均0.620 × 103 mg P kg - 1），结合能为0.64 ~ 9.00 L mg - 1（平均3.42 L mg - 1）。标准磷需取量（在0.2 mg P L−1下吸收的磷）为35 ~ 909 mg P kg−1（平均231 mg P kg−1）。母材对吸P最大值和键能均有影响。安山岩和火山灰发育的土壤P吸收最大值和结合能显著高于沉积岩和火山沉积物发育的土壤，且差异较大。主成分分析表明，印度尼西亚酸性旱地土壤中有三个主成分影响磷的吸附，即与氧化物相关的因子(铝（Al) + 1/2铁（Fe）（草酸铵）、晶体Al和Fe氧化物、阳离子交换容量和粘土含量）、酸度+ 1.4 nm矿物相关因子（交换性Al和1.4 nm矿物）和有机碳(C)相关因子（有机C和有机结合铁）。逐步回归分析表明，氧化相关因子是影响酸性土壤磷吸附最大值和结合能的主要因素。结果表明，酸度加上1.4 nm矿物相关因子导致吸磷最大值降低。有机碳相关因子不影响吸P最大值，但降低了P键能。结果表明，在估算印尼酸性旱地土壤磷吸附最大值时，除了考虑Al和Fe氧化物外，还应考虑与交换性Al和常见的蒙脱石和蛭石等1.4 nm矿物相关的土壤酸度。此外，在估算P键能时，还应考虑有机C含量和有机结合铁。0.01 mol L−1 CaCl2萃取导致吸附磷的土壤解吸率较低（< 5%），且解吸率与吸附过程中的键能呈极显著相关。
Phosphorus (P) sorption-desorption isotherms were studied in several acid upland soils developed from different parent materials in Indonesia. The soils varied in their chemical and physical properties. P sorption characteristics were satisfactorily described by the Langmuir equation, which was used to determine P sorption maxima and bonding energies. The soils varied widely in their capacity to sorb P. P sorption maxima ranged from 0.294 to 1.43 × 103 mg P kg−1 (mean 0.620 × 103 mg P kg−1) and bonding energies ranged from 0.64 to 9.00 L mg−1 (mean 3.42 L mg−1). The standard P requirements (P sorbed at 0.2 mg P L−1) ranged from 35 to 909 mg P kg−1 (mean 231 mg P kg−1). Parent materials affected the P sorption maxima and bonding energies. Soils developed from andesite and volcanic ash exhibited significantly higher P sorption maxima and bonding energies with a larger variability than the soils developed from sedimentary rock and volcanic sediments. Principal component analysis demonstrated that three principal components in Indonesian acid upland soils influenced P sorption, namely oxide-related factor (aluminum (Al) plus 1/2 iron (Fe) (by ammonium oxalate), crystalline Al and Fe oxides, cation exchange capacity, and clay content), acidity plus 1.4 nm mineral-related factor (exchangeable Al and 1.4 nm minerals) and organic carbon (C)-related factor (organic C and organically bound Fe). Stepwise regression demonstrated that the oxide-related factor was the main component actively contributing to P sorption maxima and bonding energies in these acid soils. It was demonstrated that the acidity plus 1.4 nm mineral-related factor led to the decrease of P sorption maxima. The organic C-related factor did not influence the P sorption maxima but decreased the P bonding energies. The results suggested that not only Al and Fe oxides but also soil acidity which is associated with exchangeable Al and 1.4 nm minerals of which smectite and vermiculite are common, should be included in models to estimate P sorption maxima in Indonesian acid upland soils. Furthermore, organic C content and organically bound Fe should be included in the models to estimate P bonding energies. Extraction with 0.01 mol L−1 CaCl2 led to a low soil desorbability of sorbed P (< 5%) and the desorbability was highly significantly correlated with the bonding energies during sorption.