Physical and Chemical Properties of Benggang Soils and Their Interior Differentiation —Three Cases of Typical Benggangs at Deqing County, Guangdong Province

Zhuo Ruina; Liu Xilin; Yue Meng

doi:10.13961/j.cnki.stbctb.2022.02.006

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Physical and Chemical Properties of Benggang Soils and Their Interior Differentiation —Three Cases of Typical Benggangs at Deqing County, Guangdong Province

- Physical and Chemical Properties of Benggang Soils and Their Interior Differentiation —Three Cases of Typical Benggangs at Deqing County, Guangdong Province
- Bulletin of Soiland Water Conservation Vol. 42, Issue 2, Pages: 38-45(2022)
- 作者机构：
  
  中山大学地理科学与规划学院,广东,广州,510275
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2022.02.006
  CLC： P934;S157.1
- Published：2022
- 稿件说明：
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Zhuo Ruina, Liu Xilin, Yue Meng. Physical and Chemical Properties of Benggang Soils and Their Interior Differentiation —Three Cases of Typical Benggangs at Deqing County, Guangdong Province[J]. Bulletin of Soiland Water Conservation, 2022, 42(2): 38-45.
DOI：

Zhuo Ruina, Liu Xilin, Yue Meng. Physical and Chemical Properties of Benggang Soils and Their Interior Differentiation —Three Cases of Typical Benggangs at Deqing County, Guangdong Province[J]. Bulletin of Soiland Water Conservation, 2022, 42(2): 38-45. DOI： 10.13961/j.cnki.stbctb.2022.02.006.

摘要

[目的

]

研究崩岗土体物理性质的内部分异和崩岗土体化学物质组成，为更好地理解崩岗的侵蚀过程提供理论参考。[方法

]

以广东省德庆县3个典型崩岗为例，采用筛分法、烘干法、激光粒度分析、液塑限分析、X射线衍射分析和X射线荧光光谱分析，对崩岗不同地貌部位的土体物理性质、矿物组成和化学元素进行测定。[结果

]

①崩壁土体容重略大于崩积体、沟道和洪积扇的土体容重；崩壁和崩积体的含水率和界限含水率大于沟道和洪积扇的土体含水率和界限含水率。②崩岗土体中值粒径表现为：崩壁＜崩积体＜沟道＜洪积扇；崩壁和崩积体土体颗粒级配曲线呈双峰型，沟道和洪积扇土体颗粒级配曲线呈单峰型。③崩岗土体的矿物成分以黏土矿物高岭石为主，石英和白云母次之；化合物以SiO

含量最多，其次为Al

；化学元素以Ti含量最高，S含量次之。[结论

]

崩岗不同地貌部位的土体物理性质具有一定的分异现象，水力—重力复合侵蚀作用机制是这一内部分异形成的原因。强化学风化作用下，崩岗土体黏土矿物以高岭石为主，化学物质在崩岗内部没有出现明显的元素迁移和富集现象。

Abstract

[Objective] The physical properties and their internal differentiations

and the mineral compositions and chemical elements of Benggang soil were studied in order to provide a theoretical reference for a better understanding on the benggang erosion processes. [Methods] Taking three typical Benggangs in Deqing County

Guangdong Province as examples

the methods of screening

drying

laser particle size analysis

liquid plastic limit analysis

X-ray diffraction analysis

and X-ray fluorescence spectrometry were used

to measure the basic physical properties

mineral composition and chemical elements in the different landform positions of the Benggang soil. [Results] ① Soil bulk densities of the headwalls were slightly larger than those of the colluvium

gully and diluvial fan. The water contents and limit water content of headwalls and colluvium were greater than those of the gully and diluvial fan. ② The median particle sizes of the soils were headwall ＜ colluvium ＜ gully sediments ＜ diluvium. Grain size distributions of the headwall and colluvium were bimodal

and those of the gully sediments and diluvium were single peak. ③ The mineral composition of the soils was mainly clay mineral Kaolinite

and followed by Quartz and Muscovite. The chemical components contained SiO2 and Al2O3

which were the top two in content. The content of Ti was the highest

and followed by S. [Conclusion] The physical properties of soil in different topographic position of the Benggangs displayed a certain differentiation phenomena from headwall to diluvium

and the hydraulic gravity composite erosion mechanism was the reason for the formation of this internal differentiation. Under strong chemical weathering

the composition of clay minerals was mainly composed of Kaolinite

and there was no obvious element migration and enrichment in the Benggangs.

关键词

Keywords

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