不同土层土壤对可溶性有机氮、碳的吸附特性研究  

Adsorption Characteristics of Soluble Organic Carbon and Nitrogen in Different Layer of Cultivated Soils

作　　者：赵满兴[1] 周建斌[2] 延志莲[1] 

机构地区：[1]延安大学生命学院,陕西延安716000 [2]西北农林科技大学资源环境学院,陕西杨凌712100

出　　处：《土壤通报》2010年第6期1328-1332,共5页Chinese Journal of Soil Science

基　　金：国家自然科学基金(40773057);陕西省教育厅专项科研计划项目(09JK828);延安大学科研项目(YD2007-61);延安大学重点扶持学科(细胞生物学)资助;陕西省重点扶持学科建设项目(生态学)

摘　　要：研究了陕西关中地区红油土耕层和母质层土壤对有机肥提取液中可溶性有机氮、碳(SON和SOC)的吸附特性。结果表明,原始物质吸附等温线方程可以反映土壤对可溶性有机氮、碳的吸附特性,土壤吸附SON、SOC的数量与它们各自加入的量呈极显著线性关系。不同土层相比,耕层土壤对SON的吸附能力强于母质层土壤,耕层和母质层对SOC的吸附能力相当。同一种土壤对溶液中不同成分吸附也有差别,耕层土壤对SON、SOC的平均吸附率分别为20.0%和19.4%,母质层土壤对SON、SOC的平均吸附率分别为18.5%和19.6%;耕层和母质层土壤对SON和SOC的吸附能力均较低,说明它们在土壤中具有较强的移动性,更易于从土壤中流失。In this paper,soluble organic carbon（SOC） and soluble organic nitrogen（SON） were extracted from manure,and their adsorption characteristics in arable layer and parent material horizon of Anthrosols were investigated.The results showed that the adsorption of SON and SOC in the two different layer soils could be fitted by initial mass isotherm model,and the adsorbed amounts of SON and SOC had a significant linear relationship with the initial concentrations of SON and SOC added into soils.The partition coefficient,m of the initial mass isotherm model,indicated that the arable layer had a higher adsorbility of SON than parent material horizon.But the parent material horizon and the arable layer had a same adsorbility of SOC.The average adsorption rates of SON and SOC in the arable layer were 20.0% and 19.4%,and those in parent material horizon were 18.5% and 19.6%,respectively.The low adsorption rates of SON and SOC indicated their high mobility in the two soils,and higher amount of SON was adsorbed than SOC.It suggested the higher potential of SOC leaching from soil.

关 键 词：可溶性有机氮 可溶性有机碳 吸附特性 原始物质吸附等温线 农田土壤 

分 类 号：S714[农业科学—林学]