土壤粘附系统中粘土颗粒群的内聚特性  

COHESIVE BEHAVIOR OF SOIL PARTICLE AGGREGATES IN THE SOIL ADHESION SYSTEM

作　　者：任露泉[1] 刘朝宗[1] 佟金[1] 李建桥[1] 

机构地区：[1]吉林工业大学农机工程学院

出　　处：《农业机械学报》1997年第S1期5-8,共4页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金

摘　　要：从粘土的胶体性质出发，探讨了土壤－水系统中粘土颗粒群的内聚特性。粘土矿物具有极大的比表面积，表现出的各种表面化学性质对土壤粘附起着决定作用。土壤颗粒间的“水桥”在土壤粘附中起着重要作用，通过水桥，土壤本身及土壤在触土部件表面发生物理、化学吸附，导致土壤粘附。土壤颗粒大小及含水量影响“水桥”的特征尺寸，进而影响土壤粘附性能。ome natures of soil colloid and soil particle aggregates and their effects on the cohesive characteristics of soil were discussed in this paper.It was shown that the water bridges existing between aggregates in the soilwater system was one of the main reasons resulting in the cohesion of soil.The smaller the particle size,the greater the action of the water bridges on the cohesion was.The characteristic dimensions of the water bridges were affected by the moisture content and soil particle size.The clay colloid particles had high surfacial chemical activity because of their tremendous specific surface area and,therefore,had important effects on adhesion of soil to soilengaging parts of terrain machinery.Physical and chemical interactions of soil with the soilengaging surfaces took place due to the existance of the water bridges.It is hoped that the present study will help to understand the mechanism of soil adhesion on soilengaging working parts,eventually improving their efficiency.

关 键 词：粘土 胶体 粘附力 

分 类 号：S152[农业科学—土壤学]