摘要
成土母质是影响土壤有效硅水平的主要因素，不同母质发育的水稻土有效硅平均含量顺序为：黄土性古河湖相沉积物＞近代黄泛＞淮河冲积＞石灰岩＞湖积物＞下蜀黄土＞长江冲积＞紫色砂页岩和第四纪红土＞板页岩和酸性结晶岩。土壤pH值和土壤有机质含量与土壤有效硅呈极显著正相关。安徽省水稻土有效硅含量不同地区差异很大，淮北平原＞江淮丘陵岗地＞沿江平原＞皖西山地＞皖南丘陵山地．
The range and mean valve of available silicon in the soil was 17. 2 - 724. 1 mg/kg, with an average of 136.2mg/kg .The content of availsble silicon in paddy soil of Anhui Province had a regional distribution, tended evidently from the north to the south. Parnt materials is main factor affecting the available silicon content. Content of available silicon different parent material of soil formatin decreased, in turn, as follows: Shajiang black soil,HuangHe River alluvial deposit,HuaiHe River alluvial deposit, limestone. lacustrine deposit, Xiashu loess, Chang Jiang Rirer alluvial deposit, purple sandstone,Quaternary red earth and granite. The content of available silicon was significanly correlated with pH,organic natter,and well with physical clay.
