西北黄土地区土壤腐殖物质的研究  

STUDIES ON HUMIC SUBSTANCES OF SOILS IN LOESS AREA OF NORTHWEST CHINA

作　　者：李香兰[1] 刘玉民[1] 

机构地区：[1]中国科学院西北水土保持研究所

出　　处：《土壤学报》1989年第3期298-304,共7页Acta Pedologica Sinica

摘　　要：本文研究了西北黄土地区土壤腐殖质的含量、组成、性质与分布。其结果是:1.土壤腐殖质含量,是从东南向西北呈由高到低的分布规律。2.胡敏酸的含量、胡敏酸/富里酸的比值及胡敏酸的芳构化程度,均以陕西靖边县草原植被下的轻黑垆土为中心,向西和向北荒漠草原植被下的棕钙土与白绵土;向南森林草原与森林植被下的(土娄)土和褐土;向东是黄绵土逐渐降低。胡敏素的含量是向西、北、南及东逐渐增加。3.与钙结合的胡敏酸,以黑垆土为中心是向西、北、南和东递减;与铁铝结合的胡敏酸是向西、北、南和东递加。4.胡敏酸芳构化程度:草原土壤>干草原与森林草原土壤>荒漠草原和森林土壤。The paper deals with contents, composition, characteristics and distribution of humus in loessial soils of northwest China. Results obtained are summarized as follows. 1. Distribution of humus contents of soil was getting lower from southeast to northwest. 2. The contens of humic acid, HA/FA ratio and aromaticity of humic acid were high in the light dark loessial soil under steppe vegetation in Jingbain County of Shaaxi Province, and getting decreased westward and northward to the brown pedocal and white cultivated loessial soil under the vegetation of desert steppe, and decreased southward to manured loessial soil and cinnamon soil under forest steppe and forest vegetation, also decreased eastward to yellow cultivated loessied soil. But the contents of humin was getting increaed westward, northward, southward and eastward. 3. If dark loessil soil was considered as a centre, humic acid combined with Ca were getting decreased gradully from the centre to west, north, south and east, humic acid combined with Fe, Al was getting increased from the centre to west, north, south and east. 4. Aromaticity of humic acid was in the order: steppe soils>arid steppe and forest steppe soils>desert steppe and forest soils.

关 键 词：西北地区 黄土地区 土壤腐殖质 

分 类 号：S153.622[农业科学—土壤学] S155.24[农业科学—农业基础科学]