黄河三角洲滨海盐渍土中速效磷的吸附及影响因素研究

Adsorption and influence factors of quick-acting phosphorus in seashore saline soil of Yellow River Delta

针对海水养殖废水排入海洋后其中的磷素对海洋产生的污染问题,研究其被用于灌溉后在土壤中的吸附和影响因素。结果表明:供试土壤剖面各层次速效磷的吸附量随速效磷的浓度升高而迅速增大;海水养殖废水中速效磷的含量一般在0.26 mg/L左右,海水养殖废水用于灌溉土壤完全可以吸附和利用这部分速效磷;在土壤中速效磷的吸附量与吸附所需的时间之间呈对数曲线变化,其相关关系达到了极显著水平;滨海盐渍土对速效磷的吸附规律遵循Freundlish方程;影响速效磷吸附的主要因素为土壤中CaCO3、土壤粘粒、土壤有机质含量和吸附平衡的时间等。

The quick-acting phosphorus in seawater and cultured wastewater drained into the sea will lead to the sea pollution problems. The adsorbed and influence factors of the quick-acting phosphorus in seawater and cultured wastewater were studied after irrigation. The results showed that the adsorbing capacity of the quick-acting phosphorus was increased with concentration of quick-acting phosphorus raised in every soil layer of the experimental soil profiles. The content of the quick-acting phosphorus in seawater and cultured wastewater is about 0.26 mg/L. If the seawater and cultured wastewater will be used to irrigation, the quick-acting phosphorus can be adsorbed and used by soils and plants. The adsorption of the quick-acting phosphorus with the time is significantly increased in logarithmic curve. The seashore saline soils adsorb the quick-acting phosphorus to be according to Freundlish＇s equation. The content of CaCO3 , soil clay particle, organic matter and balance time in soils were the main influence factors in quick-acting phosphorus adsorbed by soils.