黄土丘陵区不同地貌类型地球化学分布特征

根据宁夏南部黄土丘陵区彭阳古城乡黄土梁峁—茹河河谷剖面和西吉城郊乡黄土梁峁—葫芦河河谷剖面土壤样品地球化学测试的结果,分别对不同地貌部位的常量元素、微量元素和微量元素有效态的含量进行了对比研究。大多数常量元素比较稳定,K+、Na+在河谷阶地区富集,在黄土梁峁及边坡流失;CaO和Fe2O3由于土壤水的作用和氧化还原条件的不同,其含量在河谷阶地区较少;大多数微量元素在土壤中比较稳定,Ti、P、V、Zn和Ba等元素的含量:黄土丘陵梁峁顶部<河谷阶地;B在土壤中的含量:黄土丘陵梁峁顶部>黄土丘陵梁峁边坡>河谷阶地;微量元素的有效态含量:河谷阶地>黄土丘陵梁峁顶部>黄土丘陵梁峁边坡。

Geochemical Distribution Characteristics of Different Land Form Types in Loess Hilly Areas

Based on geochemical test of soil samples from the Liang and Mao-Ruhe River valley profile in Pengyang and the Liang and Mao-Huluhe River valley profile in Xiji of loess hilly areas in southen Ningxia,the studies on the contents of constant element,trace element and effective state of trace element in differentplaces of different land forms have been conducted.Most constant elements are comparativelysteady,K~(+)and Na~(+)arerich in the terrace of river valleyand loss onloess slope;The contents of CaO and Fe_(2)O_(3)are comparatively less on the terrace in river valley becauseof the function of soilwaterand oxidizingand reducing condition;Mosttrace elements are comparatively steady in the soil,the contents of Ti、P、Zn、Ba:the top of hills in loess hilly areas > the terrace in river valley;The content of B in soil: the top of loess hilly areas >the slope of loess hilly > the terrace in river valley;The effective state content of trace elements: the terrace in river valley>the top of hilly >the slope of loess hilly.