论文部分内容阅读
用颗粒大小的分布来描述土壤的相似性与相异性,已差不多有一百年了。Osborn(1887)提出了土壤机械分析的玻杯法,用来分离或测定被认为对土壤化学行为有重要作用的土壤颗粒。从二十年代一直到六十年代,许多科学家都研究过机械分析方法。大多数分析方法都是以机械筛分结合颗粒在液体中的沉降为基础的。为了取得满意的分析结果,样品的处理与分散是很重要的。许多研究者都企图改进样品的制备方法,以获得真正的分散体系,这种体系对于利用斯笃克定律测定颗粒沉降速度是必需的。颗粒分析的筛分—吸管法是大家喜欢的方
It has been about a hundred years to describe the similarity and dissimilarity of soils using particle size distributions. Osborn (1887) proposed a glass-cup method for soil mechanical analysis used to isolate or determine soil particles that are believed to play an important role in soil chemical behavior. From the twenties to the sixties, many scientists studied mechanical analysis methods. Most analytical methods are based on mechanical screening combined with the settling of particles in a liquid. In order to obtain satisfactory results, sample handling and dispersion is very important. Many researchers have attempted to improve the method of sample preparation in order to obtain a true dispersion that is necessary for the determination of particle sedimentation velocity using the Sturgent’s Law. Particle analysis of screening - straw method is everyone’s favorite side