粉煤灰理化性质与硅素释放规律的研究  

Study on physical and chemical properties of flying coal ashes and the releasing patterns of silicon

作　　者：冯跃华[1] 胡瑞芝[1] 云惊奇[1] 张杨珠[1] 邹应斌[1] 

机构地区：[1]湖南农业大学,长沙410128

出　　处：《中国生态农业学报》2005年第3期48-50,共3页Chinese Journal of Eco-Agriculture

基　　金：湖南省科技厅项目(2001)

摘　　要：对粉煤灰理化性质与Si素释放规律的研究结果表明,粉煤灰颗粒以物理性砂粒为主,占44.43%～98.67%,容重较小,pH一般＞7.5,可用作土壤改良剂;粉煤灰水溶性硅和有效硅含量与土壤差异不明显,但粉煤灰中Si在100h内释放量比土壤的高3.0～25.0倍,可为水稻等禾本科作物提供相当数量的Si营养.Elovich方程和Freundlich方程可较好地描述粉煤灰和土壤中Si释放量随时间变化的关系,Ebvich方程的b值和Freundlich方程的k值反映了Si释放能力,且b、k值越大,Si释放能力越强.The physical and chemical properites of flying coal ashes and the releasing patterns of silicon were studied.The results show that the flying coal ashes can be used as soil modifier because the physical sand accounts for 44.43%～(98.67%) in the ashes and their volume weights are lower than those of soil and their pHs generally excess 7.5.The difference in contents of water-soluble and available silicon between the ashes and soil is not obvious,but the amount of silicon released from the ashes in 100 hours is 3.0～25.0 times as high as that in soil,so the ashes can supply the growth of rice with Si.The releasing processes of Si in the ashes and soils can be well described with Elovich equation and Freundlich (equation,)in which the parameters,[WTBX]b [WTBZ]value and [WTBX]k[WTBZ] value,can express the releasing capacity of silicon in the ashes and soils.The larger of [WTBX]b [WTBZ]and [WTBX]k,[WTBZ]the more silicon is released.

关 键 词：粉煤灰 理化性质 硅素 释放规律 土壤改良剂 农业利用 

分 类 号：S141[农业科学—肥料学] S156.2[农业科学—农业基础科学]