东北芦苇湿地土壤有效硅与pH值及物质组成的关系

Relationship Between the Available Silicon of the Soil and pH and Material Composition of the Soil in the Reed Wetland in Northeast Area of China

为探究土壤有效硅与土壤pH值及物质组成的关系,在东北地区选12个样点,采集1 195个土壤样品,运用硅钼蓝比色法进行有效硅含量测定,用重铬酸钾-硫酸溶液对有机质进行测定,用pH计对酸碱度进行测定,运用ICP法进行阳离子测定。研究结果表明:在湿润地区土壤pH值与有效硅为正相关,在半湿润半干旱地区,pH值与有效硅为负相关;有机质在湿润地区和雨季时间段与有效硅呈现正相关,在半干旱地区与有效硅为负相关,但关系复杂并非简单线性相关关系;钾钠比与有效硅正相关,而钙镁比与有效硅负相关。

In 12 sites of northeastern, 1 195 soil samples were collected for the research on relationship between the available silicon of the soil and pH and material composition of the soil. The available silicon content was determined by using silicon molybdenum blue spectrophotometer. The soil cation was determined by ICP method, and pH was determined by PH meter. The result showed that there was a positive correlation between pH and the available silicon of the soil in humid area. There was a negative correlation between pH and the available silicon of the soil in the dry area. In the humid area during the rainy season, organic matter had a positive correlation to the available silicon .On the other hand, organic matter had a negative correlation to the available silicon in the semiarid zone, but the relation was complex and they do not have a simple linear relationship. There was a positive correlation between the radio of K and Na and a negative correlation between the radio of Ca and Mg.