摘要
采用长春市具有代表性的阶地农田的黏壤土、河漫滩的细砂土和黄土台地的粉壤土为基质,以提取的土壤胶体为对象,采用实验室模拟方法研究了土壤胶体理化性质对其稳定性和可移动性的影响。研究结果表明3种土壤胶体的临界絮凝浓度(CFC),与伊利石/蒙脱石矿物含量成反比并随着矿物含量的增大而降低,可能是因为伊利石/蒙脱石矿物是易絮凝矿物,水化驱动力及水化后的不稳定性较大;去除游离氧化铁后的农土去铁胶体提高了稳定性,而黄土去铁胶体和河土去铁胶体降低了稳定性,主要是由不同的土壤胶体去除游离氧化铁后性质改变程度不一样引起的;去除有机质后的农土去有机质胶体、黄土去有机质胶体和河土去有机质胶体降低了CFC,并且降低程度是与土壤胶体的有机质含量成反比。
In this experiment,clay loam,fine sand and silt loam from the farmland,floodplain and Loess platform in Changchun seperately were chosen for the matrix to study the stability and mobility of soil colloids based on physicochemical property through laboratory simulation.The study showed that the critical flocculation concentration（CFC） of the three kinds of colloids were negatively proportional to the content of illite and montmorillonite,and CFC reduced with the increase of mineral content,which might be due to illite/smectite minerals which are easy to flocculate and lead to higher hydration of the driving force and instability.De-iron colloid of farmland increased stability but for loess platform and floodplain reduce stability for different changing of property after removing the free iron cxide.After removing organic,de-organic colloids of farmland,floodplain and Loess platform reduce CFC,and the reduced degree are negatively proportional to the content of organic.
出处
《土壤》
CAS
CSCD
北大核心
2010年第6期1015-1019,共5页
Soils
基金
太原科技大学博士科研启动项目(20082019)资助
关键词
土壤胶体
理化性质
稳定性
可移动性
Soil colloids
Physicochemical property
Stability
Mobility
