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作 者 ：庞荣丽1;2;介晓磊2;3;方金豹1;谭金芳2;李有田2

期 刊 ：植物营养与肥料学报 2007年 13卷 1期 页码：39-43

关键词：有机酸；石灰性潮土；无机态磷；形态转化；

Keywords:organic acid, calcic fluvo-aquic, inorganic phosphorus, transformation,

摘 要 ：采用室内培养和化学分析的方法研究了几种有机酸对石灰性潮土无机磷形态转化的影响。结果表明,1)石灰性潮土中磷素主要以有效性很低的磷酸盐(Ca₁₀-P等)形式存在,而有效性较高的磷酸盐(Ca₈-P等)含量较少,Ca₂-P就更少。2)不同磷源施入土壤后,无机磷总量相应增加。磷酸二氢钾与磷酸二钙主要向Ca₈-P、Al-P等有效性相对较差的磷素形态转化,磷酸八钙、氟磷灰石、磷酸铁、磷酸铝等有效性较差的磷源,在较短的时期内主要以自身的形态存在。3)施加各种有机酸可以不同程度地降低土壤中Fe-P、Al-P和Ca₁₀-P含量,增加Ca₂-P、Ca₈-P和O-P含量,总的趋势是促进土壤中植物难以利用的无机磷形态向植物可以利用的形态转化。这种促进能力因有机酸种类和性质的不同而不同,其作用大小顺序为草酸>柠檬酸>酒石酸。

Abstract:The effect of organic acids on the transformation of phosphorus in calcic fluvo-aquic soil was studied under(indoor) incubation and pot culture condition.The results were following: 1) phosphorus element in form of phosphate(Ca₁₀P,etc.) with very low availability was dominated,whereas higher availability phosphate(Ca₈-P,etc.) was less and Ca₂P was the least;2) Apply phosphate with different sources increased total amount inorganic phosphorus.KH₂PO₄ and DCP transform mainly occurred oriented to Ca₈-P and Al-P etc with lower availability.OCP,FA,Fe-P and Al-P mainly exist in their own forms within a short period. 3) Organic acids addition caused the content of Ca₁₀P,Fe-P and Al-P reduction, while caused Ca₂-P,Ca₈-P and O-P enhancement to a varying extent in the soil.The general tendency observed was that organic acid application promoted the transformation of phosphates in the form of less or unavailability to higher availability.These promoting ability was varying with the varieties and properties of organic acids,among which Oxalic acid >Citric acid >Tartaric acid.

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