吉林省中部黑土黏粒矿物的组成分析

Analysis on compositions of clay minerals in black soil of central Jilin,China

为探讨玉米带黑土土壤退化的原因,通过X-射线衍射方法对吉林省中部玉米带黑土的黏粒矿物组成及分布进行了初步的研究,结果表明:黑土的黏粒矿物组成主要以2∶1型的蒙脱石及伊利石为主,二者总和达90%。伊利石在表层有增加的趋势,而蒙脱石向下则有增加的现象,此结果与黏粒的全量分析相一致。

For analyzing the causes on degeneration of the black soil in corn belt, the authors made a pilot study of the clay mineral compositions and their distributions in the black soil of the corn belt of central Jilin, by applying the X-ray diffraction method. The results show that the clay mineral compositions are characterized by montmorillonite and illite with single crystal structure type 2 ： 1, the contents of the two clay minerals account for 90 % in total. Moreover, illite tends to increase in the surface layer and montmorillonlte increases downwards in the content, which is in consistent with the total analysis of the clay.