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当前位置: 首页 > 文章 > 冻融作用对东北黑土磷素吸附-解吸过程的影响 水土保持通报 2014,34 (6) 27-31
Position: Home > Articles > Effects of Freezing-Thawing Cycles on Phosphorus Adsorption and Desorption Characteristics in Black Soil of Northeast China Bulletin of Soil and Water Conservation 2014,34 (6) 27-31

冻融作用对东北黑土磷素吸附-解吸过程的影响

作  者：
周丽丽;黄东浩;范昊明;贾燕锋
单  位：
沈阳农业大学水利学院
关键词：
冻融作用;吸附—解吸;磷;黑土
摘  要：
冻融作用对土壤理化性质具有重要影响,从而影响土壤中磷素的吸附—解吸特性。以东北黑土为研究对象,采用室内模拟冻融环境的方法,研究了冻融条件下黑土磷素吸附—解吸行为。结果表明,冻融条件下黑土对磷的吸附规律均随着外源磷浓度增加而逐渐增大,当外源磷浓度为120mg/L时吸附曲线出现明显拐点;与未冻融土壤相比,冻融过程中土壤吸附更多的磷,具有更高的磷素吸附率;外源磷浓度低时,冻融作用对土壤磷吸附影响较大,外源磷浓度高时冻融作用对土壤磷吸附影响降低;冻融条件下磷等温吸附曲线采用Langmuir方程拟合的相关性最优,在连续的冻融循环条件下,土壤磷最大吸附量Pmax值逐渐增大,土壤与磷之间结合能力和磷吸附最大缓冲容量也有同样的趋势。
译  名：
Effects of Freezing-Thawing Cycles on Phosphorus Adsorption and Desorption Characteristics in Black Soil of Northeast China
作  者：
ZHOU Li-li;HUANG Dong-hao;FAN Hao-ming;JIA Yan-feng;College of Water Conservancy,Shenyang Agriculture University;
关键词：
freezing-thawing cycles;;adsorption-desorption;;phosphorus;;black soil
摘  要：
Freezing—thawing cycles have important effects on physical and chemical properties of soil,which affect adsorption and desorption characteristics of phosphorus in soil.A laboratory experiment was conducted to determine the effects of freezing—thawing on phosphorus adsorption and desorption characteristic of black soil.The results showed that,the trend of phosphorus adsorption in freezing—thawing treatment was that all the phosphorus adsorption capacity increased with the increasing of phosphorus concentration,and there was obvious turning point when the exogenous phosphorus concentration was 120mg/L.Compared to the no freezing—thawing treatment samples,black soil adsorbed more phosphorus and had higher adsorption rate after freezing—thawing cycles.At low exogenous phosphorus concentration,freezing—thawing cycles have relatively large influence on phosphorus adsorption quantity,on the contrary,at high exogenous phosphorus concentration,the influence reduced.In the condition of freezing—thawing,phosphorus adsorption curves could be well fitted by Langmuir equation.Under the condition of successive freezing—thawing cycles,maximum adsorption capacity Pmax,combining ability between soil and phosphorus and phosphorus adsorption maximum buffer capacity has the same trend of gradual increase.

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