竞争吸附对土壤中磷素迁移规律的影响研究

Effect of Competitive Adsorption on Phosphorus Transport in Soil

采用黄壤土,以室内土柱为研究对象,探究3种不同种类有机酸(草酸、柠檬酸、乙酸)的不同浓度对土壤中磷的竞争吸附作用。结果表明:在灌溉水中加入有机酸的土柱15 cm截面处的速效磷含量都大于对照组,这说明有机酸对磷向植物根系所在土壤层的迁移具有很明显的促进作用;5 cm和15 cm截面处磷的吸附量会随着有机酸浓度的变化而发生变化,且15 cm截面处速效磷的含量会随着有机酸浓度的增加而增加;在加入相同浓度有机酸的情况下,3种有机酸促进磷迁移效果为柠檬酸>草酸>乙酸。

Indoor soil columns filled with yellow soil were used to analyze the competitive adsorption among three different organic acids （oxalic acid, citric acid and acetic acid ）with different concentrations for the phosphorus in soil. The experimental results showed that：available phosphorus contents in 15 cm section were more than that of conditional control group when organic acid was added into the irrigation water ,which suggested that organic acid made a very significant effect on promoting phosphorus＇ transfer ;the adsorption capacity of phosphorus at 5 cm section and 15 cm section changed with the change of organic acid concentration,and the contents of available phosphorus at the 15cm section increased with the increase of organic acid concentrations;the effect of three kinds of organic acids was citric acid〉oxalic acid〉acetic acid when added the same conc-entration of organic acid.