安徽省水稻土有效硅测定方法及影响因素

目的]探讨安徽省水稻土有效硅测定方法及其影响因素，为硅肥施用提供借鉴。方法]采取土壤有效硅测定方法间对比分析法以及土壤有效硅含量与土壤性质间相关分析法。结果]采取不同方法测定有效硅含量间虽有较大差异，但存在极显著线性正相关关系。供试水稻土有效硅含量存在较大差异，多数水稻土有效硅含量低于临界值。土壤母质和基本性质对有效硅含量有较大影响。结论]安徽省水稻土有效硅测定以浓度1％柠檬酸法和pH4．0醋酸-醋酸钠法方法较好。成土母质、土壤pH、黏粒含量是影响有效硅含量的主要因素。

Analysis Methods Comparison and Influencing Factors Research of Available Silicon in Paddy Soils,Anhui Province

Objective ] The research aimed to study the appropriate methods of available silicon and the influencing factors of available silicon in the paddy soils, Anhui Province, and to provide reference for silicon fertilizer application. Method] Comparative analysis of the determina- tion methods for the available silicon and correlation analysis of the soil available silicon and soil basic properties were conducted. Result] There were significant differences of the available silicon content by different analysis methods. The contents of available silicon in the tested paddy soils were different, and that of most of the tested paddy soils were lower than critical value. Soil available silicon contents were mainly affected by soil parent material and basic properties. Conclusion] The appropriate method of available silicon in the paddy soils of Anhui Province was 1% citric acid method and pH 4.0 acetic acid-sodium acetate method. The major influencing factors of the available silicon were soil parent material, soil pH and soil clay contents.