土壤对磷的吸持特性及其与土壤供磷指标之间的关系
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POTENTIAL PHOSPHATE SORPTIVITY VALUE FROM LANGMUIR EQUATION AND ITS APPLICATION FOR PHOSPHATE FERTILIZER RECOMMENDATION
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    摘要:

    本试验测定了浙江省几种代表性土壤对磷的等温吸持特性。实测值与Frundlich、Langmuir、两项式Langmuir和Temkin方程都很符合,相关系数变化范围在0.919-0.999之间,都达到极显著水平。其中以简单Langmuir等温式与本实验资料最为吻合。从Langmuir方程得到的土壤吸持特性值(k×qm)被认为与土壤供磷特性有关。几种供试样品的(k×qm)值是:针铁矿21100>黄筋泥4218>黄筋泥田991>青紫泥798>粉泥田660>高岭石485>老黄筋泥田423>泥质田298。根据土壤吸持特性值以田菁进行盆栽试验来估算作物磷肥需要量,结果表明,供磷强度0.3ppm P基本能满足田菁早期生长的需要。为使不同土壤达到相同的供磷强度,(k×qm)值大的土壤要求更高的有效磷值。供试土壤的几种磷素指标:E值、Bray1-P值和(NaOH-Na2C2O4)法值对(k×qm)值的变化比较敏感,而EDTA-P和Olsen-P指标对(k×qm)值的变化较为迟钝。

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    Some isothermal phosphate sorption curves were determined on typical soils in Zhejiang province of China. Most of the soil samples are paddy soils derived from different parent materials, The isothermal phosphate sorption data obtained all fitted very aveli with Freundlich, Temkiza, Langmuir's conventional as well as its two-site-adsorption equations, and the conventional Langmuir equatzon seemed to be the best fitted model. The parameters in the canventional Langmuir equation, namely the adsorption maximum (qm) and the constant(k)related to the bonding energy as well as their product,k×qm can be used as a comprehensive index to characterize the potential posphate sorptivity of the soil. In the present study the k×qm values of the soil samples tested were found to be 2100 for gaethite, 425-990 for paddy soils developed on red earth, and 4219 for upland red earth. With regard to the textural variation of the paddy soils k×qm value for sandy loam was 297, for silt loam, 658 and clayey soil with stagnanting water regime, up to 800.

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何振立,朱祖祥,袁可能,黄昌勇.土壤对磷的吸持特性及其与土壤供磷指标之间的关系[J].土壤学报,1988,25(4):398-404. He Zhengli, Zhu Zuxiang, Yuan Keneng, Wang Changyong. POTENTIAL PHOSPHATE SORPTIVITY VALUE FROM LANGMUIR EQUATION AND ITS APPLICATION FOR PHOSPHATE FERTILIZER RECOMMENDATION[J]. Acta Pedologica Sinica,1988,25(4):398-404.

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  • 在线发布日期: 2013-02-25
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