湖南省几种主要土壤中各种形态硅的含量顺序为无定形硅>活性硅>有效硅>水溶性硅。土壤pH、粘粒含量和CEC是影响土壤有效硅及活性硅的正效应因素,而有机质含量为负效应因素。盆裁试验结果表明,大部分土壤施硅后水稻籽粒产量显著提高,其增产率与土壤有效硅及活性硅均呈明显负相关,表明土壤活性硅也可作为衡量土壤供硅能力的指标。 The contents of various forms of silicon in several main soils in Hunan Province were amorphous silicon> active silicon> effective silicon> water-soluble silicon. Soil pH, clay content and CEC are the positive effect factors affecting soil available silicon and active silicon, while the organic matter content is a negative effect. The results of potted cutting showed that most of the grain yield of rice increased significantly after silicon application, and its yield-increasing rate was negatively correlated with soil available silicon and active silicon, indicating that active soil silicon could also be used as an indicator of soil silicon availability.