Extractable phosphorus related to forms of phosphorus and other soil properties
Extractable phosphorus related to forms of phosphorus and other soil properties
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可萃取磷与磷的形态和其他土壤特性有关
DOI：
10.1002/jsfa.2740231206
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发表时间：
1972
期刊：
影响因子：
--
通讯作者：
M. K. John
中科院分区：
文献类型：
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作者：
M. K. John
用Olsen、Bray、Morgan、北卡罗来纳州的P-1、0. 01 M-CaCl_2、酸性N-醋酸铵和同位素交换法测定土壤有效磷的方法提取的土壤磷与土壤磷的形态及其它土壤性质有关。土壤测试之间的相关性较高时，两个测试值都与一个共同的P形式，从而表明它们的相似性，在选择性溶解的特定形式。通过逐步纳入显著自变量的线性回归方程，对Olsen或Bray试验值的贡献最大的是铝-P，对同位素交换P的贡献最大的是铁-P，对北卡罗来纳州试验值的贡献最大的是钙-P。在回归方程中加入了盐基饱和度和土壤反应，以反映它们对特定磷形态的溶解和提取过程中发生的二次反应的显著影响。根据对343种不同土壤的观察，回归方程预测土壤测试值的显着的P形式和土壤性质的变化占50%以上的P土壤测试值奥尔森的，布雷的，北卡罗来纳州和0.01 M-氯化钙提取方法。没有发现任何改善时，P形态包括无论显着性和显着的土壤性质被添加到回归方程。
The soil P extracted by Olsen's, Bray's P-1, Morgan's, North Carolina, 0.01M-CaCl2, acidic N-ammonium acetate and isotopic-exchange methods of determining available P were related to the forms of soil P and to other soil properties. Correlations between soil tests were higher when both test values were well correlated with a common P form, thereby indicating their similarity in selective dissolution of specific forms. Linear regression equations derived by stepwise inclusion of significant independent variables in order of importance for explanation of variations in soil-test values, indicated that the greatest contribution to Olsen's or Bray's test values was aluminium-P, to the isotopic exchange P was iron-P and to North Carolina test values was calcium-P. Dithionite-extractable aluminium and iron, organic matter, soil texture, base saturation and soil reaction were included in regression equations to reflect their significant influence on the dissolution of specific P forms and secondary reactions occurring during the extraction process. Based on observations for 343 differing soils, regression equations to predict soil-test values from significant P forms and soil properties accounted for more than 50% of variations in P soil-test values for Olsen's, Bray's, North Carolina and 0.01 M-CaCl2 extraction methods. No improvement was found when P forms were included regardless of significance and significant soil properties were added to the regression equations.