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根据不同母质发育的土壤，采集了水稻土耕层样８６个，旱地耕层样４３个。土壤剖面样１７个，有效硅测定方法：用ｐＨ４的１ｍｏｌ／ＬＮａＯＡＣ－ＨＡＣ为提取剂，加显色剂后，用分光光度计测定含量。有效硅总的趋势是酸性岩及其变质岩发育的土壤低于沉积岩的含量；第四纪沉积物中，Ｑ４低于Ｑ２时期的含量。在相同气侯条件下，成土母质和粘粒含量是影响有效硅含量的主要因素
According to the soil with different parent materials, 86 paddy soil samples were collected and 43 paddy soil samples were collected. Soil profiles 17, effective silicon Determination: pH 4 1mol / LNaOAC-HAC as extractant, add color reagent, the content was measured by a spectrophotometer. The overall trend of effective silicon is that the content of acidic rock and its metamorphic rocks is lower than that of sedimentary rocks. In Quaternary sediments, Q4 is lower than that of Q2. Under the same climate conditions, the content of soil parent material and clay is the main factor affecting the effective silicon content