风沙土不同有机组分对磷的吸附特征影响  

Effect of Organic Matter Fraction on Sorption of Phosphorus on Sandy Soil

作　　者：王而力[1] 王嗣淇[1] 庄晶 

机构地区：[1]辽宁工程技术大学环境科学与工程学院,辽宁阜新123000 [2]辽宁省阜新市环境监测中心站,辽宁阜新123000

出　　处：《农业环境科学学报》2012年第11期2207-2214,共8页Journal of Agro-Environment Science

基　　金：辽宁省教育厅科研项目(20060391)

摘　　要：采用平衡吸附法研究了风沙土不同有机组分对磷的吸附特征影响,可为有机组分吸附态磷携载量估算提供依据。结果表明:去除有机质后的风沙土对磷的吸附能力大大降低,其碳标化饱和吸附量(Гmo)c和吸附分配系数(ko)c分别只能达到重组的27.76%和8.45%,说明有机质是影响磷在风沙土上吸附特征的重要因素;磷在轻组有机组分上的吸附以分配作用为主(koc=51.02);风沙土有机组分中的重组有机质对磷的吸附起主导作用(Гmoc=388.35mg.kg-1),重组有机组分中的紧结态腐殖质(胡敏素)对磷的吸附起关键作用(Гmoc=1007.96mg.kg-1),影响机制主要为稳、紧结态腐殖质是形成土壤疏松多孔团聚体结构的重要胶结物质。在其所形成的有机矿质复合体中除分配作用吸附外,还存在着孔隙填充方式的磷吸附;考查土壤对磷的吸附能力不但要考虑有机质的含量,更要考虑有机质的存在形态,它也是影响土壤对磷吸附特征的重要因素。以重组为基准,轻组有机组分以及重组有机组分中稳结态腐殖质和紧结态腐殖质携载的吸附态磷分别可按0.69倍以及1.37、2.75倍估算。Effect of organic matter fraction on sorption of phosphorus on sandy soil was investigated by batch experiments of equilibrium adsorption.The results indicated that the sorption capacity on the sandy soil reduced dramatically after the humus was removed.Normalized sorption capacity and partition coefficient only accounted for 27.76% and 8.45% of original sample.Humus was a main factor in the sorption of phosphorus on sandy soil.On the one hand,distribution function was the main process in phosphorus sorption on light fraction of organic matter,normalized partition coefficient was 51.02.On the other hand,heavy fraction was glass-state colloid,it played a leading role in the sorption of phosphorus and the normalized sorption capacity was 388.35 mg.kg-1.The sorption mechanism of phosphorus on the glass-state colloid was micro-hole function filling except distribution function.Furthermore,normalized sorption capacity of tightly combined humus（humin）of the heavy fraction was 1 007.96 mg.kg-1.Stably combined humus and tightly combined humus were important adhesive material in the formation of loose and porous structure on sandy soil aggregate.Consequently,there was a micro-hole filling function in phosphorus sorption on organo-mineral complexes.Taking into account the adsorption capacity was not only organic matter content,but also existent state of organic matter,and it was also a main factor in sorption characteristic of ammonium nitrogen on sandy soil.When regarding heavy fraction as a basic standard,adsorption state ammonium nitrogen on light fraction of the organic matter,stably combined humus and tightly combined humus were estimated in accordance with 0.69,1.37 times and 2.75 times.

关 键 词：风沙土 有机组分 磷 吸附 碳标化吸附分配系数 碳标化饱和吸附量 

分 类 号：X131.3[环境科学与工程—环境科学]