科尔沁沙地奈曼旗普通风砂土中的粘土矿物

通过对科尔沁沙地奈曼旗普通风砂土中粘土矿物的研究,结果表明这类土壤中的粘土矿物主要是伊利石,其次为高岭石、绿泥石、伊利石-蒙脱石混层矿物;它们主要来源于母质,其次来自成土过程,降尘输入量极有限。随成土过程不断进行,粘土矿物主要遵循铝硅酸盐矿物→绿泥石→绿泥石-蒙脱石→蒙脱石顺序演变。由于母质本身贫乏、成土过程较弱以及比重差异使蒙脱石有独特的搬运与沉降行为,共同造成土壤中缺乏蒙脱石。

CLAY MINERALS IN HAPLIC AEOLIAN SANDY SOILS OF NAIMAN BANNER IN HORQIN SANDY LAND

The results of studing the clay minerals in haplic aeolian sandy soils of Naiman Banner in Horqin Sandy Land show that illite is predominant, which followed by kaolinite, chlorite and illite-montmorillonite interlayer mineral. These clay minerals mainly come from parent material, a few from pedogenic processes, and dust input is minute- With continuous development of these soils,clay minerals evolute according to the sequence of aluminosilicate mineiials→ chlorite→ chlorite-nontmoiillonite interlayer minera→ montmorillonite. There exists no montmoiillonite in all samples because of lacking it in parent material, weak pedo-genic processes which can not form it, and specific gravity difference from other clay minerals which causes different behaviors of transportation and deposition.