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最近几年,土壤溶液化学,特别是其与植物养分循环的关系,日益受到人们的关注。除田间研究外,由于各种提取土壤水分方法的建立,对这一问题已在室内进行了研究。提取土壤水的方法主要有两种:(1)将样品高速离心,和(2)利用与水不溶混的,比重较大的有机溶剂进行离心。前一种方法往往需用特殊仪器,而用溶剂进行置换则比较简单,只需用标准离心管就行。但经验表明,使用后法时,有机质含量高的土(如泥炭)和低容重的粘质土,常有表面漂浮的趋势,使土壤水的提取难以进行。本文介绍一种简便的高速离心法,此法仅将市售的离心管稍为改进即可应用,无需专门加工。
In recent years, soil solution chemistry, especially its relationship with plant nutrient cycling, has drawn increasing attention. In addition to field studies, this issue has been studied indoors due to the various methods of extracting soil moisture. There are two main ways to extract soil water: (1) high speed centrifugation of the sample, and (2) centrifugation with a water-immiscible, relatively large proportion of organic solvent. The former method often requires the use of special equipment, and solvent replacement is relatively simple, just use a standard centrifuge tube on the line. However, experience shows that soil with high organic matter (such as peat) and clay with low bulk density tend to float when using the post-application method, making it difficult to extract soil water. This article describes a simple high-speed centrifugation, this method is only a slight improvement on the commercially available centrifuge tube can be applied without special processing.