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第二次全国土壤普查已开展多年,各地从土壤普查中获得了大量分析数据,为了提高土壤普查质量,兹对华东区有关土壤分类的一些土壤分析项目、分析方法、分析数据的整理和应用提出下列设想,希望通过交流和讨论使之逐渐完善,以便使这些分析数据能更充分地阐明有关的土壤性质.一、关于土壤阳离子交换量的测定土壤阳离子交换量建议采用“有效交换量”,其测定方法是:首先用1N NH_4OAC溶液(pH7.0)浸提样土,将浸提液定容后,分别测定Ca、Mg(EDTA、络合滴定)及K、Na(火焰光度计法).它们之和即为交换性盐基总量.
The second national soil survey has been carried out for many years, and lots of analytical data have been obtained from the soil census. In order to improve the quality of the soil census, some soil analysis items, analytical methods and analysis data about the soil classification in East China are put forward and put forward The following ideas, hoping to gradually improve through exchanges and discussions, so that these analytical data can more fully elucidate the nature of the soil.First, the determination of soil cation exchange capacity of soil cation exchange recommended “effective exchange capacity”, which The determination method is as follows: firstly, the sample soil is leached with 1N NH4OAC solution (pH7.0), and after the volume of the extract is fixed, Ca, Mg (EDTA, complexometric titration) and K and Na (flame photometer method) are respectively measured. The sum of them is the total amount of exchangeable base.