磷酸对石灰性土壤pH及微量元素有效性的影响  

Effect of phosphoric acid on pH and micronutrient availability in calcareous soil

作　　者：姚晓芹[1,2] 马文奇[3] 楚建周[3] 

机构地区：[1]中国科学院成都生物所 [2]河北农业大学资源与环境学院,保定071001 [3]河北农业大学资源与环境学院

出　　处：《土壤肥料》2005年第2期14-16,20,共4页Soils and Fertilizers

基　　金：河北省博士资金资助项目 (0 15 470 0 3D)

摘　　要：通过室内培养试验 ,以硫酸为对照研究了磷酸对石灰性土壤的酸化效果及微量元素有效性的影响。培养 1周结果表明 ,随酸浓度增加 ,土壤 pH降低 ,低浓度时磷酸对石灰性土壤的酸化效果强于对照硫酸 ,高浓度时硫酸酸化效果强于磷酸 ,有效Fe、Mn的含量随着酸浓度的增加先增加后降低 ,有效Zn的含量随着酸浓度的增加而增加 ,有效Cu的含量随着磷酸浓度的增加而增加 。A incubative experiment was conducted to study the effect of phosphoric acid (H_2SO_4 as control) on pH and micronutrient availability in calcareous soil. Results showed that soil pH declined with content of added acid increasing. Acidification of phosphoric acid outweighted sulfuric acid at low concentration, however it was opposite at high concentration. With increasing of acid concentration, the content of available Fe and Mn rised at first and then declined . the content of available Zn and Cu was also added but the content of Cu went down dramatically as concentration of sulfuric acid exceeded a higher concentration(1mol/L)..

关 键 词：磷酸 硫酸 石灰性土壤 微量元素 有效性 pH 

分 类 号：S153[农业科学—土壤学]