环境工程学报2013，Vol.7Issue(7)：2757-2762,6.
不同利用方式土壤中磷的吸附与解吸特性
Characteristics of phosphate adsorption and desorption in soils under different utilization
摘要
Abstract
The characteristics and influencing factors of phosphate adsorption and desorption in soils under different land uses (dryland and paddy field) were investigated in this study.Through the constant-temperature incubation experiment,the process of phosphate adsorption and desorption,which carried out by stages,was studied in three various soil types (red soil,alluvial soil and purple soil) of Hunan respectively.The results showed that Langmuir equation gave a better fitting capability than Freundlich equation,all of correlation coefficients of Langmuir equation were beyond 0.90 (P ＜ 0.05).By comprehensively taking Qm (maximum quantity of adsorption),K (adsorption constant) and MBC (maximum buffing capacity) into account,we found in the aspects of both intensity and capacity of P adsorption that dryland soils showed superior to paddy soils.The phosphorus desorption rate increasing with the level of adsorbed P in dryland was greater than that in paddy soil.Qm had positive correlation with the content of clay (＜ 0.002 mm) and amorphous iron with correlation coefficient of 0.95 and 0.94,respectively (P ＜ 0.05).The characteristics of phosphate adsorption and desorption varied greatly.Therefore,different phosphorus management measures should be adopted in view of the different soils in order to achieve higher crop production and environmental benefit.关键词
土壤利用方式/磷/吸附解吸/无定形铁Key words
soil utilization/ phosphorus/ adsorption and desorption/ amorphous iron分类
资源环境引用本文复制引用
邱亚群,甘国娟,刘伟,刘妍,侯红波,彭佩钦,高铁军..不同利用方式土壤中磷的吸附与解吸特性[J].环境工程学报,2013,7(7):2757-2762,6.基金项目
国家科技支撑计划"南方丘陵地区农业面源污染防控技术集成与示范"(20012BAD15B04) （20012BAD15B04）
