Institute of Karst Geology, Chinese Academy of Geological SciencesHost
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YU Yuefeng, ZENG Chengcheng, SONG Tongqing, PENG Wanxia, HE Tieguang. Spatial variation of limestone soil minerals in a karst area of northwestern Guangxi[J]. Carsologica Sinica, 2023, 42(3): 509-516, 527. doi: 10.11932/karst20230303
Citation: YU Yuefeng, ZENG Chengcheng, SONG Tongqing, PENG Wanxia, HE Tieguang. Spatial variation of limestone soil minerals in a karst area of northwestern Guangxi[J]. Carsologica Sinica, 2023, 42(3): 509-516, 527. doi: 10.11932/karst20230303
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Spatial variation of limestone soil minerals in a karst area of northwestern Guangxi

  • 1.

    Agricultural Resources and Environment Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, Guangxi 530007, China

  • 2.

    Institute of Subtropical Agriculture Ecology, Chinese Academy of Sciences, Changsha, Hunan 410125, China

  • 3.

    Guangxi Key Laboratory of Arable Land Conservation, Nanning, Guangxi 530007, China

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Received Date:  16 February 2021
Publish Date:  25 June 2023
    Abstract

  • As extremely important components of soil and constitutors of soil skeleton, soil minerals account for over 95% of the solid mass of soil. They directly participate in the entire process of soil weathering, soil formation, and plant growth and development, impacting significantly on the internal structure, exchange capacity, and fertility status of soil. Studying the spatial distribution of soil mineral elements is of great significance for understanding and mastering soil development, physical and chemical properties, and the supply status of plant nutrients. Because of the special formation matrix and ecological environment conditions of carbonate rock—the parent material of limestone soil in karst areas, soil in karst areas presents a high degree of spatial heterogeneity. At the same time, the shortage of mineral nutrients may be an important limiting factor for the growth and restoration of vegetation in mountainous areas of carbonate rock in southwestern China. However, the spatial distribution characteristics of soil minerals on a large scale in the karst area of northwestern Guangxi are currently unclear. Clarifying the spatial variation characteristics of limestone minerals in the karst area of northwestern Guangxi can provide reference for the effective utilization of mineral resources and ecological restoration and reconstruction. In order to explore the distribution pattern of the main soil mineral components in the karst area of northwestern Guangxi and to guide vegetation restoration and ecological reconstruction in the relevant area, the spatial heterogeneity of mineral components (SiO2, Fe2O3, CaO, MgO, Al2O3, and MnO) in surface soil (0-15 cm) and its influencing factors were studied by the methods of classical statistics and geostatistics. The soil samples were collected by the grid method based on the whole karst regional scale in northwestern Guangxi. The results show that the content differences and variance coefficients of six mineral components in limestone soil of karst area in northwestern Guangxi are large. The average content of SiO2 is up to 55.72%, while the variance coefficient is the smallest (37.50%). The sum of SiO2 and Al2O3 accounts for 85.22% of the total six mineral components. The spatial patterns of the six mineral components are quite different from each other, and fit different models of mineral components. The spatial autocorrelation of SiO2 is medium, but the autocorrelations of Al2O3 and MnO are weak, and their ranges are long in good spatial continuum. CaO, Fe2O3 and MgO are characterized by strong spatial autocorrelations with short ranges. The spatial distribution of minerals is closely related to the main nutrients and topographic characteristics. The spatial variation of Al2O3 and Fe2O3 is mainly affected by the altitude. The bare rock rate is the main topographic factor affecting the spatial variation of SiO2, MnO and MgO, and the gradient is the main factor affecting the spatial distribution of CaO. A principal component analysis show that the soil mineral is an important factor affecting the spatial variation of limestone soil, especially SiO2. On a large regional scale, various topographic factors affect the spatial variation limestone soil minerals, and hence impacting the spatial distribution of limestone soil.

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