黄壤土壤微团聚体对磷(P)热力学吸附-解吸特性研究  

The Adsorption and Desorption Characteristics of Microaggregates in Various Size Fractions of Yellow Soil on Phosphorus

作　　者：曹明康 鲁洋[1] 郭云楼 

机构地区：[1]四川省林业调查规划院,四川成都610081

出　　处：《四川林勘设计》2017年第2期30-36,共7页Sichuan Forestry Exploration and Design

摘　　要：本研究以雅安雨城区黄壤作为研究对象,采用批培养法研究了微团聚体(2~0.25mm,0.25~0.053 mm,0.053~0.002 mm,<0.002 mm)对磷(P)的吸附-解吸特性。结果表明:Langmuir和Freundlich方程均能较好的描述各粒径微团聚体对磷(P)的等温吸附过程,但Langmuir方程拟合效果最佳;各粒径微团聚体对对磷(P)的最大吸附量的顺序为:(<0.002 mm)>(0.053~0.002 mm)>(0.25~0.053 mm)>(2~0.25 mm),即粒径越小其最大吸附量越高。各粒径微团聚体对P的吸附量与土壤有机质、CEC、游离氧化铁含量呈正相关。磷(P)在各粒径微团聚体上解吸量与其吸附量呈指数关系。In this paper, batch culture method was conducted to study the adsorp- tion and desorption characteristics of aggregates from yellow soil in various size fractions（2 - 0. 25 ram,0.25 - 0. 053 mm,0. 053 - 0. 002 mm, 〈 0. 002 mm） on Phosphorus （P）. The results showed that Langmuir and Freundlich equations could described the adsorption process of aggregates from yellow soil in various size frac- tions on P, but Langmuir equation had the best fitting effect. The maximum ad- sorption of aggregates in various size fractions on P decreased in the order： （ 〈 0.002 mm） 〉（0.053-0.002mm） 〉 （ 0. 25 - 0. 053 mm） 〉（2-0.25 mm）. It suggested that the smaller the particle size had the higher adsorption capacity. Fur- thermore, the adsorption capacity of aggregates in various size fractions on P were positive correlated with the soil organic matter, CEC and free iron oxide. The ad- sorption of microaggregates on P had exponential relationship with the desorption

关 键 词：微团聚体 磷(P) 吸附-解吸 

分 类 号：S155.23[农业科学—土壤学]