Climate Change Indicated by Heavy Metals in Holocene Loess Profile in Changcheng Tableland

ZHANG Yu-zhu; HUANG Chun-chang; PANG Jiang-li; YANG Hong-jin

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Climate Change Indicated by Heavy Metals in Holocene Loess Profile in Changcheng Tableland

- Climate Change Indicated by Heavy Metals in Holocene Loess Profile in Changcheng Tableland
- Bulletin of Soiland Water Conservation Vol. 32, Issue 4, Pages: 96-102(2013)
- 作者机构：
  
  陕西师范大学旅游与环境学院,陕西,西安,710062
- 作者简介：
- 基金信息：
- DOI：
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- Published：2013
- 稿件说明：
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ZHANG Yu-zhu, HUANG Chun-chang, PANG Jiang-li, et al. Climate Change Indicated by Heavy Metals in Holocene Loess Profile in Changcheng Tableland[J]. Bulletin of Soiland Water Conservation, 2013, 32(4): 96-102.
DOI：

ZHANG Yu-zhu, HUANG Chun-chang, PANG Jiang-li, et al. Climate Change Indicated by Heavy Metals in Holocene Loess Profile in Changcheng Tableland[J]. Bulletin of Soiland Water Conservation, 2013, 32(4): 96-102. DOI：

摘要

通过广泛的野外考察

选择宁夏自治区长城塬全新世黄土土壤剖面进行了系统采样以及化学元素、磁化率、和粒度等多指标的测定。结果表明:(1)重金属元素Mn

V和Cr的含量变化趋势与磁化率、烧失量和黏粒含量变化趋势呈正相关关系

而它们与CaCO

和粗粉沙含量变化趋势呈负相关关系。这些重金属元素的含量在全新世中期古土壤层(S

)中呈现高值

在各黄土层(L

)中呈现低值。这表明风化成壤过程中

这些元素的含量变化受到全新世以来季风气候变化和成壤作用的影响。(2)重金属元素Pb含量变化趋势与上述元素的含量变化趋势相比差异较大。Pb的含量变化趋势与磁化率变化趋势无明显相关性

Pb的含量变化趋势与黏粒和烧失量变化趋势呈负相关关系

而与粗粉沙含量变化趋势呈正相关关系。Pb的含量在全新世早期过渡性黄土层(L

)呈现最低值

在全新世中期古土壤层(S

)、近代黄土层(L

)和现代表土层(TS)相对较高

并与晚更新世马兰黄土层(L

)相当

表明Pb主要包含在粗颗粒和重矿物之中

其化学性质比较稳定

具有强抗风化性

很少受到风化成壤作用的影响。

Abstract

Based on filed survey

soil samples were collected systematically in the Holocene loess profile in Changcheng tableland

the Ningxia Hui Autonomous Region.Chemical elements

magnetic susceptibility

particle-size distribution

loss on ignition and the content of calcium carbonate were measured in the laboratory. The results showed that:(1)There was a significant positive correlation between the curves of the heavy metals(Mn

V and Cr)and the curves of magnetic susceptibility

loss on ignition and clay. While a negative correlation was showed between the curves of the heavy metals(Mn

V and Cr)and the curves of the content of calcium carbonate and coarse silt.The contents of these heavy metals in the mid-Holocene Ustic Isohumisol were higher than that in the loess.It indicated that these heavy metals were affected by weathering and pedogenesis along with the Holocene climatic change.(2)The shape of the curve between the Pb was different from that of the heavy metals(Mn

V and Cr).The curve of Pb was uncorrelated with the curve of magnetic susceptibility.The content of Pb was very low in the transitional loess(Lt).The content of Pb was relatively high with very small variability in the Ustic Isohumisol (S0)and in the recent loess and topsoil(L0

TS).It seemed that these elements are not much affected by climatic change in the Holocene.

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