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东北地区主要旱地土壤有效硅（SiO2，下同）含量为黑土、褐土较高，草甸土、棕壤居中，白浆土最少;有效硅平均含量分别为605.1、577.5、357.0、271.3、149.2mg／kg土壤有效硅含量与土壤的pH及粘粒含量呈极显著和显著正相关。在一定水分条件下，施入土壤中的硅在0～30天内主要以植物可利用的水溶态或硅胶形态存在，在0～20天内土壤有效硅含量变化不大，20～30天趋于减少。土壤各种形态硅含量为无定形硅＞活性硅＞水溶性硅。有效硅含量与活性硅的相关关系达极显著水平（r=0.8438**，n=16），与无定形硅及水溶性硅无明显相关。
The contents of available silicon (SiO2, the same below) in the main dryland soil in Northeast China are black soil, high cinnamon soil, meadow soil and brown soil are the middle, the white soil is the least; the average contents of available silicon are 605.1,577.5,357.0,271.3 and 149.2 mg / kg soil available silicon content and soil pH and clay content was extremely significant and significant positive correlation. Under certain water conditions, the silicon applied to the soil mainly exists in the plant-available water-soluble or silica gel form within 0-30 days, and the available silicon content does not change much in 0-20 days and tends to decrease in 20-30 days . Soil various forms of silicon content of amorphous silicon> active silicon> water-soluble silicon. The correlation between effective silicon content and active silicon reached an extremely significant level (r = 0.8438 **, n = 16), which was not significantly related to amorphous silicon and water-soluble silicon.