我国北亚热带白浆化土壤矿物学特性的研究

STUDY ON MINERALOGICAL PROPERTIES OF ALBIC SOILS IN THE NORTHERN SUBTROPICAL REGION OF CHINA

本文对北亚热带地区七个白浆化土壤的原生矿物和次生矿物的特性进行了研究。重、轻矿物含量表明土壤继承了母质的特性，粘淀层与漂白层的母质沉积是间断的，前者风化强度大于后者。石英颗粒表面特征显示漂白层物质来源于黄土物质再堆积，粘土矿物以水云母为主，其结晶度较差，氧化铁类型以外铁矿和赤铁矿为主，也有非晶质氧化铁和硅酸盐中的Fe2+，其形成条件与现代成土条件一致。

This paper deals with the primary and secondary mineralogical properties of seven pedons of albic soils from the northern subtropical region of China. The contents of heavy and light minerals show that the soils inherit the parent material properties, the parent material between albic E horizon and argillic horizons are lithologically uncountinous, and the former horizons are weathered strongly than latter ones. The surface of the arenaceous quata shows albic E horizons result from the loess reaccumulahon. Hydrornica dominates the clay frachon of albic soils, the kaolinite formahon and clay mineral crystallinity show the desilicification and depotassication,the clay minerals can collapse to some extent. The dominant iron oxides are hemahte and geomite, these iron oxides are proved to have formed under the condihons consistent with present ones.