崩岗土体物理化学性质及其内部分异——以广东省德庆县3个典型崩岗为例
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P934;S157.1

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国家自然科学基金项目“模拟降雨条件下华南崩岗泥砂流产流输沙试验研究”(41971006)


Physical and Chemical Properties of Benggang Soils and Their Interior Differentiation —Three Cases of Typical Benggangs at Deqing County, Guangdong Province
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    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SiO2含量最多,其次为Al2O3;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.

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卓瑞娜,刘希林,岳梦.崩岗土体物理化学性质及其内部分异——以广东省德庆县3个典型崩岗为例[J].水土保持通报,2022,42(2):38-45,52

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  • 收稿日期:2021-08-29
  • 最后修改日期:2021-10-25
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  • 在线发布日期: 2022-05-26
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