紫色母岩不同粒级风化物钾素形态分配特征

Distribution of Potassium Form in Different Class of Weathered Particles of Purple Rocks

通过自然风化分析研究了侏罗系蓬莱镇组(J3p)、沙溪庙组(J2s)、遂宁组(J3s)和白垩系城墙岩群(K1C)紫色母岩不同粒级风化物钾素形态,结果表明:其全钾随风化物粒级的增加而增大,>0 5mm的粒级,平均比<0 5mm粒级多0 4～8 95g/kg;水溶态钾平均含量均较高,变化在20 61～37 87mg/kg之间。且有随粒级增大而减小的趋势;遂宁组母岩交换性钾平均含量最高,为123 91mg/kg。城墙岩群母岩平均含量最低,仅60 07mg/kg,其钾素有效性最低。>2mm粒级风化物,其交换性钾含量较高;同一种母岩,非交换性钾含量高的集中在0 05～1mm粒级中,最低集中在2～10mm粒级中;粒级越大,其结构钾含量越高,紫色母岩风化过程中,结构钾也在不断释放,风化程度越高,其结构钾释放越多。

Natural weathering experiments and chemical analysis were conducted to study the distribution of potassium forms in the different class of weathered particles developed from the purplish rocks formed in the Jurassic (group penglaizhenJ3P, group shaximiaoJ2S, and group suiningJ3S) and Cretaceous (group chengqiangyanK1C) period Results showed, total K increases along with the particle size, in which these in particles of > 005mm were 04～895 g/kg more than in particles of <005 mm Water soluble K of weathered matters was as high as 2061～3787 mg/kg, which decreases along with particle size Exchangeable potassium of J3S is 12391 mg/kg, highest in the four weathered matters, however that of K1C is 6007 mg/kg, lowest Exchangeable K of>2 mm weathered particles is relatively high Meanwhile, nonexchangeable K is higher in the 005～1 mm particles and lower in the 2～10 mm particle And the bigger particle is, the higher structural K there will be The structural K released during the weathered course of purple rock And the more extensive the purplish rock weathers, the more structural K releases