摘要
以三峡库区典型坡面紫色土为例,对土壤中微量元素的含量及其在不同坡度、不同利用方式下的变化进行初步研究。结果表明,库区紫色土中Fe、Mn、N i、Zr、Sr和Ti的含量相对较多,Mo的含量较为丰富,Zn和Pb的含量相对较低。Pb、Cu和Co的含量在一定坡度范围内随坡地坡度的增大而减少,Zr和Cr的含量则增加。紫色土中Cu、Pb、Co、Ti、Zr、N i、Cr、Sr等微量元素的含量随坡度的变化具有一定的相关性。耕作土和非耕作土中微量元素含量差异明显,人为活动是引起库区紫色土微量元素含量变化的主要因素。
As a case study of purple soil on typical slope lands in the Three Gorges Reservoir region, this paper primarily explores trace element contents in purple soil and their changes under the different grades as well as the different land-use types. The result shows that the contents of Fe, Mn, Ni, Zr, Sr and Ti in purple soil in the Three Gorges Reservoir region are higher than the background values of purple soil （ A layer） in China and the average value of all the soil （ A layer） in Sichuan, that of Mo is very rich, but those of Zn and Pb are lower relatively than the ones of Sichuan and China. Contents of Pb, Cu and Co are decreasing along with grade increase among some grades. By contraries, the contents of Zr and Cr are increasing. The contents of Cu, Pb, Co, Ti, Zr, Ni, Cr, Sr, etc. in purple soil have some correlations with the changes of slope grades. Difference of trace element contents is remarkable between cultivated land and uncultivated land. The man-made activities are primary factors leading to the changes of trace element contents of purple soil in the Three Gorges Reservoir region.
出处
《地理科学》
CSCD
北大核心
2006年第5期592-596,共5页
Scientia Geographica Sinica
基金
国家自然科学基金项目(40272126)资助
关键词
紫色土
微量元素含量
变化
三峡库区
purple soil
trace element content
Three Gorges Reservoir region
