湖北省土壤有效硅含量分布

在全省主要土壤上布点，取土壤样品529个．全省土壤有效硅（SiO2）平均含量为202.6mg／kg，含量变化范围为15．7－725.5mg／kg，低于缺硅临界值（＜95mg／kg）的样点占总样点的38.2％．其土壤有效硅平均含量高的有：黄褐土（471．3mg／kg）、石灰土（377.3mg／kg）和灰潮土（332.7mg／kg）；平均含量中等的有：紫色土（189、5mg／kg）、水稻土（174.7mg／kg）、潮土（110.7mg／kg）、黄棕壤（106.0mg／kg）；平均含量低于缺硅临界值的有红壤（89.1mg／kg）和黄壤（41.4mg／kg）土壤有效硅含量对土壤母质有依赖关系．土壤pH值及水稻上不同水型对土壤有效硅含量也有影响，土壤有效硅含量与土壤有效磷、铁、锰存在着相关关系．

Study on Soil Available Silicon Content and Si Fertilizer Application in Hubei

529 soil samples were taken from main soils in Hubei for the investigaion of the distribution and content of soil available Si. Results show that the average content of soil available Si in Hubei was 202.6 mg/kg with the range of 15.7-725.5 mg/kg, and with that of 38.2% samples below soil Si critical value (<95mg/kg). The main soils with high values of soil available Si were yellow cinnamon soil (471.3 mg/kg), calcareous soil (377.3 mg/kg), and calcareous alluvial soil (332.7 mg/kg). Those with medium values of soil available Si were purple soil (189.5 mg/kg),paddy soil (174.7 mg/kg), alluvial soil (110.7 mg/kg), yellow brown soil (106.0mg/kg) and those with soil available Si below critical value were red soil (89.1 mg/kg) and yellow soil (41.4 mg/kg). Soil available Si depended on parent materials, and was also affected by soil pH and water types of paddy soil. Soil available Si related to soil available P,Fe and Mn.