摘要
在介绍土壤常见几种理论吸附模型的基础上 ,以关中河漫滩、阶地、山前洪积扇和黄土台塬这些地区浅部土壤为例 ,在室内同等条件下 ,对不同土壤进行吸附实验 ,探讨不同土壤对 NH4+ - N的吸附特征和吸附能力。结果表明 ,NH4+ - N吸附作用符合兰缪尔 ( Langmuir)等温吸附模型。土壤对NH4+ - N的吸附性的强弱与土壤颗粒大小百分含量有关。土壤中粘粒百分含量越高 ,吸附性就越强。这些土壤对 NH4+ - N吸附的最大容量在 0 .2～ 0 .9g/kg之间。
On the basis of soil adsorption theory models being introduced,the low layer soils in river floodplain,terrace,submontane floodplain and loess tableland of guanzhong area are used an example,and in the same condition,these soils adsorption characters and adsorption capacities to NH 4+-N were studied by experiments in laboratory.The results indicated that NH 4+-N adsorption in soils accord with Langmuir isothermal adsorption pattern.Adsorption capacity relates to grain size percent content.The more clay particles percent content,the larger adsorption capacity.The maximal adsorption capacities of these soils are from 0.2 g to 0.9 g per kilogram soil.
基金
长安大学青年科技发展基金资助 ( 0 2 Q13 )
关键词
铵态氮
土壤吸附
等温吸附模式
吸附容量
NH 4+-N
adsorption
isothermal adsorption patterns
maximal adsorption capacity
soils particles size percent content
