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| 三峡库区不同地貌区土壤元素分布特征 | |
| 引用本文： | 唐将,李勇,付绍红,邓富银,雷家立,张茂忠.三峡库区不同地貌区土壤元素分布特征[J].山地学报,2005,23(2):136-143. |
| 作者姓名： | 唐将 李勇 付绍红 邓富银 雷家立 张茂忠 |
| 作者单位： | 1. 成都理工大学地球科学学院,四川,成都,610059 2. 中国科学院地球化学研究所,贵州,贵阳,550002 3. 重庆川东南地质调查研究院,重庆,401329 |
| 基金项目： | 国土资源部十五重点调查资助项目 (NO :2 0 0 3 14 2 0 0 0 0 6)~~ |
| 摘 要： | 利用土壤表层样分析成果，探讨三峡库区不同地貌区土壤中Ca、P、B等43个常量元素及微量元素的分布特征，结果表明：三峡库区重庆段八个地貌分区可明显划分为两个地球化学分区，一区为河谷平原、侵蚀剥蚀台地、丘陵、低山及中山地貌地球化学分区；二区为褶皱抬升低山、中山及喀斯特地貌地球化学分区，两区的土壤元素含量差异明显，除常量元素K2O、SiO2、Ba、MgO、P、Zr及微量元素Sr、La外，一区土壤中其他元素含量总体上均远低于二区土壤中的含量，其差异总体上是地质背景差异的体现，母岩岩性是土壤元素的主要控制因素。在同类母岩条件下，地貌对土壤中元素分布具有明显影响。不同地貌区的土壤营养元素聚类既有共性也有个性，喀斯特地貌区元素聚为五类；褶皱抬升中山、低山区聚类结果基本一致，均为四类；侵蚀剥蚀中山区多数元素较分散，分异强烈，总体上聚为四类，但第四类各元素间距离较远；侵蚀剥蚀低山与丘陵区元素聚类总体上相近，均为五类，但内部存在分异；侵蚀剥蚀台地则聚为三大类。土壤中的某些特征矿物元素如Fe2O3、Mn、Cu、Zn组合，N、org．C组合在各个地貌区均聚为一类；而某些元素如Cl等在不同地貌条件下分别与MgO、CaO或与Na2O聚类，体现元素在不同地貌条件下的分布特征差异。 |
| 关 键 词： | 三峡库区 元素分布特征 地球化学分区 喀斯特地貌 土壤营养元素 微量元素 常量元素 土壤元素 地貌条件 Fe2O3 土壤表层 地貌分区 河谷平原 含量差异 SiO2 元素含量 控制因素 聚类结果 矿物元素 Na2O 特征差异 MgO 剥蚀 |
| 文章编号： | 1008-2786(2005)02-136-08 |
| 修稿时间： | 2004年8月11日 |
The Element Distribution Characteristics of Soils in Different Topography in the Three Gorge Reservoir |
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| TANG Jiang,LI Yong,FU Shaohong,DENG Fuying,LEI Jiali,ZHANG Maozhong.The Element Distribution Characteristics of Soils in Different Topography in the Three Gorge Reservoir[J].Journal of Mountain Research,2005,23(2):136-143. | |
| Authors: | TANG Jiang LI Yong FU Shaohong DENG Fuying LEI Jiali ZHANG Maozhong |
| Institution: | TANG Jiang~1, LI Yong~1, FU Shaohong~2, DENG Fuying~3, LEI Jiali~3, ZHANG Maozhong~3 |
| Abstract: | According to the analysis results of topsoil, the distribution characteristics of main elements and trace elements, including Ca, P, and B, etc. in soils from different topography in the area of the Three Gorge Reservoir have been discussed. The results show that two geo-chemical districts can be divided in the Chongqing area of Three Gorge Reservoir. One is the river valley plain and erode denudation topography district, another is fold uplift and karst topography district. The element contents in soils from two districts have different characteristics. Except the main element K_2O, SiO_2, Ba, MgO, P and Zr and trace element Sr and La, the contents of other elements in the first district is much lesser than those of the second district. These characteristics are determined by the diversity of the geological background. The element distribution of the soils, forming from same kinds of parent rocks ,is influenced by the types of topography. From the valley plains to erosion plateaus and hills, the parent rocks are the mudstones and sandstones mostly, so the contents of B and Bi etc are almost alike in different topography section. When the elevation rises, the contents of Ca, Pb, Zn and La etc decrease, and Se, I and Nb increase. Except SiO_2, Zr, Nb, Se, I, Br, W, and As, the main elements and trace elements in mid-mountain of erode and denudation type are lower than that of other topographies. The soil and water loss is responsible for lower contents of elements in this area. When some elements, such as CaO, Cu, Y, and Cl, transfer from high topography to lower topography they behave the jump change characteristics. The clustering of elements in soils according to the different topography, show the various features. The elements, such as Fe_2O_3, Mn, Cu, and Zn group or N and org.C group cluster in the same kind in different topography. But some element, such as Cl, cluster with MgO and CaO or Na_2O in terms of the topographical condition, showing the assembled characteristics of elements vary in various topography. |
| Keywords: | Three Gorge Reservoir topography soil element distribution characteristics |
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