• 论文 •

### 欧亚大陆东西部棕壤的成土条件与主要发生学性质的初步比较

1. 南京大学地理系
• 出版日期:1983-01-20 发布日期:1983-01-20

### A COMPARATIVE STUDY OF THE SOIL-FORMING FACTORS AND THE PRINCIPAL GENETIC CHARACTERISTICS OF BROWN EARTHS IN THE EASTERN AND WESTERN REGIONS OF EURASIA

Ni Shaoxiang

1. Department of Geography, Nanking University
• Online:1983-01-20 Published:1983-01-20

Abstract: Study was made by analyzing the soil-forming factors as well as the physicaland chemical data of 69 profiles of the brown earths in the eastern and westernregions of Eurasia.It has been found,on the one hand,that the pH,the cation exchangecapacity,the exchangeable Ca++ and Mg++ as well as the base saturation perce-ntage in the surface horizons of the brown earths are higher in the westernregion than in the eastern region.It indicates that the leaching in the brownearths is stronger in the western region than in the eastern region which isagreeable with the bioclimatic conditions of both regions.On the other hand,the comparison has shown that the silica-seoquioxide ratio and the absolute valueof the deviation between the calculated content and the determined content in thehorizons with the largest amount of clay particle are higher in the eastern regionthan in the western region.Besides,the rate of silica-seoquioxide ratio between thesurface horizon and parent material (the transport coefficient K)mostly is morethan 1 in the brown earths of the eastern region.It indicates that the seoqui-oxide of iron and aluminium has apparently transported down profiles and thesilica has apparently accumulated in the surface horizons.In my view,it mightbe a relic element in the present brown earths left over during the old soil-forming process.